Merge branch 'dev_citygml3' into 'dev'

CityGML 3.0. Support

See merge request !10

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/CityFurniture.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
+import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
+import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
+import de.hft.stuttgart.citydoctor2.utils.Copyable;
+import org.citygml4j.core.model.core.AbstractCityObject;
+import org.citygml4j.core.util.geometry.GeometryFactory;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurface;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
+import org.xmlobjects.gml.model.geometry.primitives.Solid;
+import org.xmlobjects.gml.model.geometry.primitives.SolidProperty;
+
+import java.io.Serial;
+
+public class CityFurniture extends CityObject {
+
+    @Serial
+    private static final long serialVersionUID = 3325661061543962473L;
+
+    private org.citygml4j.core.model.cityfurniture.CityFurniture cgmlCityFurniture;
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+    }
+
+
+    @Override
+    public AbstractCityObject getGmlObject() {
+        return cgmlCityFurniture;
+    }
+
+    public void setGmlObject(org.citygml4j.core.model.cityfurniture.CityFurniture gmlCityFurniture) {
+        cgmlCityFurniture = gmlCityFurniture;
+    }
+
+    @Override
+    public void unsetGmlGeometries() {
+        cgmlCityFurniture.setLod0MultiSurface(null);
+        cgmlCityFurniture.setLod2MultiSurface(null);
+        cgmlCityFurniture.setLod3MultiSurface(null);
+        cgmlCityFurniture.setLod1Solid(null);
+        cgmlCityFurniture.setLod2Solid(null);
+        cgmlCityFurniture.setLod3Solid(null);
+        cgmlCityFurniture.getDeprecatedProperties().setLod4Geometry(null);
+    }
+
+    @Override
+    public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
+        for (Geometry geom : getGeometries()) {
+            if (geom instanceof ImplicitGeometryHolder) {
+                continue;
+            }
+            if (geom.getType() == GeometryType.MULTI_SURFACE) {
+                MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
+                setMultiSurfaceAccordingToLod(geom, ms);
+            } else {
+                Solid solid = CityGmlUtils.createSolid(geom, factory, config);
+                setSolidAccordingToLod(geom, solid);
+            }
+        }
+    }
+
+    private void setMultiSurfaceAccordingToLod(Geometry geom, MultiSurface ms) {
+        switch (geom.getLod()) {
+            case LOD0:
+                cgmlCityFurniture.setLod0MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD2:
+                cgmlCityFurniture.setLod2MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD3:
+                cgmlCityFurniture.setLod3MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            default:
+                throw new IllegalStateException("Cannot add " + geom.getLod() + " multi surface to buildings");
+        }
+    }
+
+    private void setSolidAccordingToLod(Geometry geom, Solid solid) {
+        switch (geom.getLod()) {
+            case LOD1:
+                cgmlCityFurniture.setLod1Solid(new SolidProperty(solid));
+                break;
+            case LOD2:
+                cgmlCityFurniture.setLod2Solid(new SolidProperty(solid));
+                break;
+            case LOD3:
+                cgmlCityFurniture.setLod3Solid(new SolidProperty(solid));
+                break;
+            default:
+                throw new IllegalStateException("Cannot add " + geom.getLod() + " solid to buildings");
+        }
+    }
+
+    @Override
+    public FeatureType getFeatureType() {
+        return FeatureType.CITY_FURNITURE;
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new CityFurniture();
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        CityFurniture originalCF = (CityFurniture) original;
+        cgmlCityFurniture = originalCF.cgmlCityFurniture;
+    }
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/CityObject.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,184 +18,191 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
-
-import org.citygml4j.core.model.core.AbstractCityObject;
-import org.citygml4j.core.util.geometry.GeometryFactory;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
 import de.hft.stuttgart.citydoctor2.check.CheckError;
 import de.hft.stuttgart.citydoctor2.check.CheckId;
 import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
 import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
+import org.citygml4j.core.model.core.AbstractCityObject;
+import org.citygml4j.core.util.geometry.GeometryFactory;
+
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
 
 /**
  * Abstract class for general features such as Buildings, Water objects, ...
  * <br>
  * Contains the geometries
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public abstract class CityObject extends GmlElement {
 
-	@Serial
-	private static final long serialVersionUID = 651712070755024188L;
-
-	private final List<Geometry> geometryList = new ArrayList<>();
-
-	/**
-	 * Recreates the CityGML4j geometry in this object. The CityGML4j geometry is
-	 * deleted from the data structure as was mapped to the city doctor data
-	 * structure. For writing CityGML files the geometry has to be restored. Also
-	 * maps changes to geometry back to CityGML4j
-	 * 
-	 * @param factory needed to create CityGML4j data structures
-	 * @param config  contains information whether a city doctor point was
-	 *                transformed to a different coordinate system. It would need to
-	 *                be transformed to the original coordinate system
-	 */
-	public abstract void reCreateGeometries(GeometryFactory factory, ParserConfiguration config);
-
-	/**
-	 * Getter for the CityGML4j data object
-	 * 
-	 * @return the CityGML4j data object
-	 */
-	public abstract AbstractCityObject getGmlObject();
-
-	/**
-	 * Remove the CityGML4j geometries from the data structure to save memory.
-	 */
-	public abstract void unsetGmlGeometries();
-
-	public void addGeometry(Geometry geom) {
-		Objects.requireNonNull(geom);
-		geometryList.add(geom);
-		geom.setParent(this);
-	}
-
-	public List<Geometry> getGeometries() {
-		return geometryList;
-	}
-
-	public void removeGeometry(Lod lod) {
+    @Serial
+    private static final long serialVersionUID = 651712070755024188L;
+
+    private final List<Geometry> geometryList = new ArrayList<>();
+    private final List<GenericAttribute> genericAttributeList = new ArrayList<>();
+    /**
+     * Recreates the CityGML4j geometry in this object. The CityGML4j geometry is
+     * deleted from the data structure as was mapped to the city doctor data
+     * structure. For writing CityGML files the geometry has to be restored. Also
+     * maps changes to geometry back to CityGML4j
+     *
+     * @param factory needed to create CityGML4j data structures
+     * @param config  contains information whether a city doctor point was
+     *                transformed to a different coordinate system. It would need to
+     *                be transformed to the original coordinate system
+     */
+    public abstract void reCreateGeometries(GeometryFactory factory, ParserConfiguration config);
+
+    /**
+     * Getter for the CityGML4j data object
+     *
+     * @return the CityGML4j data object
+     */
+    public abstract AbstractCityObject getGmlObject();
+
+    /**
+     * Remove the CityGML4j geometries from the data structure to save memory.
+     */
+    public abstract void unsetGmlGeometries();
+
+    public void addGeometry(Geometry geom) {
+        Objects.requireNonNull(geom);
+        geometryList.add(geom);
+        geom.setParent(this);
+    }
+
+
+    public List<Geometry> getGeometries() {
+        return geometryList;
+    }
+
+    public void removeGeometry(Lod lod) {
         geometryList.removeIf(geom -> geom.getLod() == lod);
-	}
-	
-	public void removeGeometry(Lod lod, GeometryType type) {
+    }
+
+    public void removeGeometry(Lod lod, GeometryType type) {
         geometryList.removeIf(geom -> geom.getLod() == lod && geom.getType() == type);
-	}
-
-	public Geometry getHighestLodGeometry() {
-		Geometry highestLodGeometry = null;
-		Lod highestLod = null;
-		for (Geometry geom : geometryList) {
-			if (highestLod == null || geom.getLod().isHigher(highestLod)) {
-				highestLodGeometry = geom;
-				highestLod = geom.getLod();
-			}
-		}
-		return highestLodGeometry;
-	}
-
-	public abstract FeatureType getFeatureType();
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-		for (Geometry geom : geometryList) {
-			geom.accept(c);
-		}
-	}
-
-	@Override
-	public boolean containsError(CheckId checkIdentifier) {
-		boolean hasError = super.containsError(checkIdentifier);
-		if (hasError) {
-			return true;
-		}
-		for (Geometry geom : geometryList) {
-			if (geom.containsError(checkIdentifier)) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	@Override
-	public void clearAllContainedCheckResults() {
-		super.clearCheckResults();
-		for (Geometry geom : geometryList) {
-			geom.clearAllContainedCheckResults();
-		}
-	}
-
-	@Override
-	public void collectContainedErrors(List<CheckError> errors) {
-		super.collectContainedErrors(errors);
-		for (Geometry geom : geometryList) {
-			geom.collectContainedErrors(errors);
-		}
-	}
-
-	@Override
-	public boolean containsAnyError() {
-		boolean hasError = super.containsAnyError();
-		if (hasError) {
-			return true;
-		}
-		for (Geometry geom : geometryList) {
-			if (geom.containsAnyError()) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	public Geometry getGeometry(GeometryType type, Lod lod) {
-		for (Geometry geom : geometryList) {
-			if (geom.getType() == type && geom.getLod() == lod) {
-				return geom;
-			}
-		}
-		return null;
-	}
-
-	@Override
-	public void prepareForChecking() {
-		for (Geometry geom : geometryList) {
-			geom.prepareForChecking();
-		}
-	}
-
-	@Override
-	public void clearMetaInformation() {
-		for (Geometry geom : geometryList) {
-			geom.clearMetaInformation();
-		}
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		for (Geometry geom : geometryList) {
-			handler.addInstance(geom);
-		}
-	}
-
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		super.fillValues(original, handler);
-		CityObject originalCo = (CityObject) original;
-		for (Geometry geom : originalCo.geometryList) {
-			geometryList.add(handler.getCopyInstance(geom));
-		}
-	}
+    }
+
+    public Geometry getHighestLodGeometry() {
+        Geometry highestLodGeometry = null;
+        Lod highestLod = null;
+        for (Geometry geom : geometryList) {
+            if (highestLod == null || geom.getLod().isHigher(highestLod)) {
+                highestLodGeometry = geom;
+                highestLod = geom.getLod();
+            }
+        }
+        return highestLodGeometry;
+    }
+
+    public void addGenericAttribute(GenericAttribute genericAttribute) {
+        genericAttributeList.add(genericAttribute);
+    }
+
+    public List<GenericAttribute> getGenericAttributes() {
+        return genericAttributeList;
+    }
+
+    public abstract FeatureType getFeatureType();
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+        for (Geometry geom : geometryList) {
+            geom.accept(c);
+        }
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        boolean hasError = super.containsError(checkIdentifier);
+        if (hasError) {
+            return true;
+        }
+        for (Geometry geom : geometryList) {
+            if (geom.containsError(checkIdentifier)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearCheckResults();
+        for (Geometry geom : geometryList) {
+            geom.clearAllContainedCheckResults();
+        }
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        super.collectContainedErrors(errors);
+        for (Geometry geom : geometryList) {
+            geom.collectContainedErrors(errors);
+        }
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        boolean hasError = super.containsAnyError();
+        if (hasError) {
+            return true;
+        }
+        for (Geometry geom : geometryList) {
+            if (geom.containsAnyError()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public Geometry getGeometry(GeometryType type, Lod lod) {
+        for (Geometry geom : geometryList) {
+            if (geom.getType() == type && geom.getLod() == lod) {
+                return geom;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public void prepareForChecking() {
+        for (Geometry geom : geometryList) {
+            geom.prepareForChecking();
+        }
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        for (Geometry geom : geometryList) {
+            geom.clearMetaInformation();
+        }
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        for (Geometry geom : geometryList) {
+            handler.addInstance(geom);
+        }
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        CityObject originalCo = (CityObject) original;
+        for (Geometry geom : originalCo.geometryList) {
+            geometryList.add(handler.getCopyInstance(geom));
+        }
+    }
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/CompositeCollection.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author Riegel
+ */
+public final class CompositeCollection {
+
+    @Serial
+    private static final long serialVersionUID = -1867197873443341287L;
+
+    private GmlId gmlId;
+    private List<ConcretePolygon> compositeMembers = new ArrayList<>();
+    private List<CompositeCollection> childComposites = new ArrayList<>();
+
+    public void addCompositeMember(ConcretePolygon p) {
+        compositeMembers.add(p);
+        p.setPartOfComposite(this);
+    }
+
+    public void addAllChildComposites(List<CompositeCollection> children) {
+        childComposites.addAll(children);
+    }
+
+    public List<CompositeCollection> getChildComposites() {
+        return childComposites;
+    }
+
+    public List<ConcretePolygon> getCompositeMembers() {
+        List<ConcretePolygon> copy = new ArrayList<>(compositeMembers);
+        for (CompositeCollection c : childComposites) {
+            copy.addAll(c.getCompositeMembers());
+        }
+        return copy;
+    }
+
+    public List<ConcretePolygon> getNonRecursiveCompositeMembers() {
+        return compositeMembers;
+    }
+
+    public void setGmlId(GmlId gmlId) {
+        this.gmlId = gmlId;
+    }
+
+    public GmlId getGmlId() {
+        return gmlId;
+    }
+
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/ConcretePolygon.java

@@ -18,11 +18,6 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
 import de.hft.stuttgart.citydoctor2.check.CheckError;
 import de.hft.stuttgart.citydoctor2.check.CheckId;
@@ -33,6 +28,11 @@ import de.hft.stuttgart.citydoctor2.tesselation.TesselatedPolygon;
 import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
 
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
 /**
  * A polygon that actually contains the rings and points representing the
  * geometry
@@ -49,12 +49,11 @@ public class ConcretePolygon extends Polygon {
 	private List<LinearRing> innerRings;
 	private BoundarySurface partOfSurface;
 	private Installation partfOfInstallation;
+	private CompositeCollection partOfComposite = null;
 	private Geometry parent;
 	private LinkedPolygon linkedFromPolygon;
 	
-	public ConcretePolygon() {
-		// TODO Auto-generated constructor stub
-	}
+	public ConcretePolygon() {}
 
 	/*
 	 * (non-Javadoc)
@@ -138,6 +137,18 @@ public class ConcretePolygon extends Polygon {
 		parent = geometry;
 	}
 
+	protected void setPartOfComposite(CompositeCollection comp) {
+		this.partOfComposite = comp;
+	}
+
+	public CompositeCollection getPartOfComposite() {
+		return partOfComposite;
+	}
+
+	public boolean isCompositeMember() {
+		return (partOfComposite != null);
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * 

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/Edge.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,202 +18,201 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
+import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
+import de.hft.stuttgart.citydoctor2.utils.Copyable;
+
 import java.io.Serial;
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 
-import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
-import de.hft.stuttgart.citydoctor2.utils.Copyable;
-
 /**
  * Representing an edge between two consecutive points of a linear ring
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class Edge implements Serializable, Copyable {
 
-	@Serial
-	private static final long serialVersionUID = -504694863498128296L;
-
-	private final List<Polygon> adjacentPolygons = new ArrayList<>(2);
-	private final List<LinearRing> adjacentRings = new ArrayList<>(2);
-
-	private Vertex from;
-	private Vertex to;
-
-	// start with 1 for a new edge
-	private int numberOfHalfEdges = 1;
-	private int numberOfOppositeHalfEdges;
-
-	public Edge(Vertex from, Vertex to) {
-		this.from = from;
-		this.to = to;
-	}
-
-	private Edge() {
-	}
-
-	public Vertex getFrom() {
-		return from;
-	}
-
-	public Vertex getTo() {
-		return to;
-	}
-
-	public void addHalfEdge(Vertex v0, Vertex v1) {
-		if (v0 == null || v1 == null) {
-			return;
-		}
-		if (isPointOfEdge(v0, from) && isPointOfEdge(v1, to)) {
-			numberOfHalfEdges++;
-			return;
-		}
-		if (isPointOfEdge(v1, from) && isPointOfEdge(v0, to)) {
-			numberOfOppositeHalfEdges++;
-			return;
-		}
-		throw new IllegalStateException(
-				"The given vertices do not form this edge\n v0=" + v0 + ", v1=" + v1 + ", edge" + this);
-	}
-
-	private boolean isPointOfEdge(Vertex v0, Vertex edgePoint) {
+    @Serial
+    private static final long serialVersionUID = -504694863498128296L;
+
+    private final List<Polygon> adjacentPolygons = new ArrayList<>(2);
+    private final List<LinearRing> adjacentRings = new ArrayList<>(2);
+
+    private Vertex from;
+    private Vertex to;
+
+    // start with 1 for a new edge
+    private int numberOfHalfEdges = 1;
+    private int numberOfOppositeHalfEdges;
+
+    public Edge(Vertex from, Vertex to) {
+        this.from = from;
+        this.to = to;
+    }
+
+    private Edge() {
+    }
+
+    public Vertex getFrom() {
+        return from;
+    }
+
+    public Vertex getTo() {
+        return to;
+    }
+
+    public void addHalfEdge(Vertex v0, Vertex v1) {
+        if (v0 == null || v1 == null) {
+            return;
+        }
+        if (isPointOfEdge(v0, from) && isPointOfEdge(v1, to)) {
+            numberOfHalfEdges++;
+            return;
+        }
+        if (isPointOfEdge(v1, from) && isPointOfEdge(v0, to)) {
+            numberOfOppositeHalfEdges++;
+            return;
+        }
+        throw new IllegalStateException(
+                "The given vertices do not form this edge\n v0=" + v0 + ", v1=" + v1 + ", edge" + this);
+    }
+
+    private boolean isPointOfEdge(Vertex v0, Vertex edgePoint) {
         return v0.equals(edgePoint);
     }
 
-	public boolean formedByIgnoreDirection(Vertex v1, Vertex v2) {
-		return (v1 == from && v2 == to) || (v1 == to && v2 == from);
-	}
-
-	public boolean equalsIgnoreDirection(Edge other) {
-		return (other.from.equals(from) && other.to.equals(to)) || (other.from.equals(to) && other.to.equals(from));
-	}
-
-	public int getNumberOfHalfEdges() {
-		return numberOfHalfEdges;
-	}
-
-	public int getNumberOppositeHalfEdges() {
-		return numberOfOppositeHalfEdges;
-	}
-
-	public int getNumberOfAllHalfEdges() {
-		return numberOfHalfEdges + numberOfOppositeHalfEdges;
-	}
-
-	public List<Polygon> getAdjacentPolygons() {
-		return adjacentPolygons;
-	}
-
-	public List<LinearRing> getAdjacentRings() {
-		return adjacentRings;
-	}
-
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + ((from == null) ? 0 : from.hashCode());
-		result = prime * result + ((to == null) ? 0 : to.hashCode());
-		return result;
-	}
-
-	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
-			return true;
-		}
-		if (obj == null) {
-			return false;
-		}
-		if (getClass() != obj.getClass()) {
-			return false;
-		}
-		Edge other = (Edge) obj;
-		if (from == null) {
-			if (other.from != null) {
-				return false;
-			}
-		} else if (!from.equals(other.from)) {
-			return false;
-		}
-		if (to == null) {
+    public boolean formedByIgnoreDirection(Vertex v1, Vertex v2) {
+        return (v1 == from && v2 == to) || (v1 == to && v2 == from);
+    }
+
+    public boolean equalsIgnoreDirection(Edge other) {
+        return (other.from.equals(from) && other.to.equals(to)) || (other.from.equals(to) && other.to.equals(from));
+    }
+
+    public int getNumberOfHalfEdges() {
+        return numberOfHalfEdges;
+    }
+
+    public int getNumberOppositeHalfEdges() {
+        return numberOfOppositeHalfEdges;
+    }
+
+    public int getNumberOfAllHalfEdges() {
+        return numberOfHalfEdges + numberOfOppositeHalfEdges;
+    }
+
+    public List<Polygon> getAdjacentPolygons() {
+        return adjacentPolygons;
+    }
+
+    public List<LinearRing> getAdjacentRings() {
+        return adjacentRings;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((from == null) ? 0 : from.hashCode());
+        result = prime * result + ((to == null) ? 0 : to.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        Edge other = (Edge) obj;
+        if (from == null) {
+            if (other.from != null) {
+                return false;
+            }
+        } else if (!from.equals(other.from)) {
+            return false;
+        }
+        if (to == null) {
             return other.to == null;
-		} else return to.equals(other.to);
-    }
-
-	public void addAdjacentPolygon(Polygon p) {
-		adjacentPolygons.add(p);
-	}
-
-	public void addAdjacentRing(LinearRing lr) {
-		adjacentRings.add(lr);
-	}
-
-	@Override
-	public String toString() {
-		return "Edge [from=" + from + ", to=" + to + "]";
-	}
-
-	public boolean contains(Vertex v) {
-		return v == from || v == to;
-	}
-
-	public Vertex getConnectionPoint(Edge e) {
-		if (from == e.getTo() || from == e.getFrom()) {
-			return from;
-		}
-		if (to == e.getTo() || to == e.getFrom()) {
-			return to;
-		}
-		return null;
-	}
-
-	/**
-	 * finds the point on the other end of the edge if the given vertex is one of
-	 * the end points.
-	 * 
-	 * @param c the given vertex
-	 * @return the opposite vertex or null if the given vertex is not an end point.
-	 */
-	public Vertex getOppositeVertex(Vertex c) {
-		if (c == from) {
-			return to;
-		}
-		if (c == to) {
-			return from;
-		}
-		return null;
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		handler.addInstance(from);
-		handler.addInstance(to);
-		handler.addInstance(adjacentPolygons);
-		handler.addInstance(adjacentRings);
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new Edge();
-	}
-
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		Edge originalEdge = (Edge) original;
-		from = handler.getCopyInstance(originalEdge.from);
-		to = handler.getCopyInstance(originalEdge.to);
-		numberOfHalfEdges = originalEdge.numberOfHalfEdges;
-		numberOfOppositeHalfEdges = originalEdge.numberOfOppositeHalfEdges;
-		for (Polygon originalPoly : originalEdge.adjacentPolygons) {
-			adjacentPolygons.add(handler.getCopyInstance(originalPoly));
-		}
-		for (LinearRing originalRing : originalEdge.adjacentRings) {
-			adjacentRings.add(handler.getCopyInstance(originalRing));
-		}
-	}
+        } else return to.equals(other.to);
+    }
+
+    public void addAdjacentPolygon(Polygon p) {
+        adjacentPolygons.add(p);
+    }
+
+    public void addAdjacentRing(LinearRing lr) {
+        adjacentRings.add(lr);
+    }
+
+    @Override
+    public String toString() {
+        return "Edge [from=" + from + ", to=" + to + "]";
+    }
+
+    public boolean contains(Vertex v) {
+        return v == from || v == to;
+    }
+
+    public Vertex getConnectionPoint(Edge e) {
+        if (from == e.getTo() || from == e.getFrom()) {
+            return from;
+        }
+        if (to == e.getTo() || to == e.getFrom()) {
+            return to;
+        }
+        return null;
+    }
+
+    /**
+     * finds the point on the other end of the edge if the given vertex is one of
+     * the end points.
+     *
+     * @param c the given vertex
+     * @return the opposite vertex or null if the given vertex is not an end point.
+     */
+    public Vertex getOppositeVertex(Vertex c) {
+        if (c == from) {
+            return to;
+        }
+        if (c == to) {
+            return from;
+        }
+        return null;
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        handler.addInstance(from);
+        handler.addInstance(to);
+        handler.addInstance(adjacentPolygons);
+        handler.addInstance(adjacentRings);
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new Edge();
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        Edge originalEdge = (Edge) original;
+        from = handler.getCopyInstance(originalEdge.from);
+        to = handler.getCopyInstance(originalEdge.to);
+        numberOfHalfEdges = originalEdge.numberOfHalfEdges;
+        numberOfOppositeHalfEdges = originalEdge.numberOfOppositeHalfEdges;
+        for (Polygon originalPoly : originalEdge.adjacentPolygons) {
+            adjacentPolygons.add(handler.getCopyInstance(originalPoly));
+        }
+        for (LinearRing originalRing : originalEdge.adjacentRings) {
+            adjacentRings.add(handler.getCopyInstance(originalRing));
+        }
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/FeatureType.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -20,13 +20,12 @@ package de.hft.stuttgart.citydoctor2.datastructure;
 
 /**
  * Possible feature types in CityGML
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public enum FeatureType {
 
-	BUILDING, TRANSPORTATION, VEGETATION, BRIDGE, LAND, WATER, BOUNDARY_SURFACE, INSTALLATION, OPENING,
-	BUILDING_PART, BRIDGE_CONSTRUCTION_ELEMENT, BRIDGE_INSTALLATION
-
+    BUILDING, TRANSPORTATION, VEGETATION, BRIDGE, LAND, WATER, BOUNDARY_SURFACE, INSTALLATION, OPENING,
+    BUILDING_PART, BUILDING_SUBDIVISION, BRIDGE_CONSTRUCTION_ELEMENT, BRIDGE_INSTALLATION, ROOM, FURNITURE, CITY_FURNITURE,
+    GENERIC_CITY_OBJECT, TUNNEL, TUNNEL_PART, TUNNEL_CONSTRUCTION_ELEMENT, TUNNEL_INSTALLATION,
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GenericAttribute.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.citygml4j.core.model.core.AbstractGenericAttributeProperty;
+import org.citygml4j.core.model.generics.*;
+
+
+public class GenericAttribute {
+
+    private static final Logger logger = LogManager.getLogger(GenericAttribute.class);
+
+    private final AbstractGenericAttributeProperty original;
+
+    private String type;
+    private String name;
+    private String value;
+
+    public GenericAttribute(AbstractGenericAttributeProperty attributeProperty) {
+        original = attributeProperty;
+        if (attributeProperty.getObject() == null) {
+            logger.warn("GenericAttribute {} is null", attributeProperty);
+            return;
+        }
+        name = attributeProperty.getObject().getName();
+
+        if (attributeProperty.getObject() instanceof StringAttribute sa) {
+            type = "StringAttribute";
+            value = sa.getValue();
+        } else if (attributeProperty.getObject() instanceof IntAttribute ia) {
+            type = "IntAttribute";
+            value = ia.getValue().toString();
+        } else if (attributeProperty.getObject() instanceof DoubleAttribute da) {
+            type = "DoubleAttribute";
+            value = da.getValue().toString();
+        } else if (attributeProperty.getObject() instanceof DateAttribute date) {
+            type = "DateAttribute";
+            value = date.getValue().toString();
+        } else if (attributeProperty.getObject() instanceof UriAttribute ua) {
+            type = "UriAttribute";
+            value = ua.getValue();
+        } else if (attributeProperty.getObject() instanceof MeasureAttribute ma) {
+            type = "MeasureAttribute";
+            value = ma.getValue().toString();
+        } else if (attributeProperty.getObject() instanceof CodeAttribute ca) {
+            type = "CodeAttribute";
+            value = ca.getValue().toString();
+        } else {
+            logger.warn("GenericAttribute {} is of unknown type {}", attributeProperty, attributeProperty.getObject());
+            value = attributeProperty.getObject().getValue().toString();
+            type = "Unknown type";
+        }
+
+    }
+
+    public AbstractGenericAttributeProperty getOriginal() {
+        return original;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s: [ %s = %s ]", type, name, value);
+    }
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GenericCityObject.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.check.CheckError;
+import de.hft.stuttgart.citydoctor2.check.CheckId;
+import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
+import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
+import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
+import de.hft.stuttgart.citydoctor2.utils.Copyable;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.citygml4j.core.model.core.AbstractCityObject;
+import org.citygml4j.core.model.core.AbstractSpaceBoundaryProperty;
+import org.citygml4j.core.util.geometry.GeometryFactory;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurface;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
+import org.xmlobjects.gml.model.geometry.primitives.Solid;
+import org.xmlobjects.gml.model.geometry.primitives.SolidProperty;
+
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ */
+public class GenericCityObject extends CityObject {
+
+    @Serial
+    private static final long serialVersionUID = 5886527664552294353L;
+
+    private org.citygml4j.core.model.generics.GenericOccupiedSpace cgmlGos;
+
+    private static final Logger logger = LogManager.getLogger(GenericCityObject.class);
+
+    private final List<BoundarySurface> boundarySurfaceList = new ArrayList<>();
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.accept(c);
+        }
+    }
+
+    @Override
+    public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
+        for (Geometry geom : getGeometries()) {
+            if (geom instanceof ImplicitGeometryHolder) {
+                continue;
+            }
+            if (geom.getType() == GeometryType.MULTI_SURFACE) {
+                MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
+                setMultiSurfaceAccordingToLod(geom, ms);
+            } else {
+                Solid solid = CityGmlUtils.createSolid(geom, factory, config);
+                setSolidAccordingToLod(geom, solid);
+            }
+        }
+        for (BoundarySurface bs : boundarySurfaceList) {
+            reCreateBoundarySurface(factory, config, bs);
+        }
+    }
+
+    private void reCreateBoundarySurface(GeometryFactory factory, ParserConfiguration config, BoundarySurface bs) {
+        if (bs.getGeometries().isEmpty()) {
+            for (AbstractSpaceBoundaryProperty bsp : cgmlGos.getBoundaries()) {
+                if (bsp.getObject() != null && bsp.getObject() == bs.getGmlObject()) {
+                    logger.warn("Found empty boundary surface: {}, removing from generic object", bs.getGmlId());
+                    cgmlGos.getBoundaries().remove(bsp);
+                    break;
+                }
+            }
+            return;
+        }
+        bs.reCreateGeometries(factory, config);
+    }
+
+    private void setMultiSurfaceAccordingToLod(Geometry geom, MultiSurface ms) {
+        switch (geom.getLod()) {
+            case LOD0:
+                cgmlGos.setLod0MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD2:
+                cgmlGos.setLod2MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD3:
+                cgmlGos.setLod3MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            default:
+                throw new IllegalStateException("Cannot add " + geom.getLod() + " multi surface to buildings");
+        }
+    }
+
+    private void setSolidAccordingToLod(Geometry geom, Solid solid) {
+        switch (geom.getLod()) {
+            case LOD1:
+                cgmlGos.setLod1Solid(new SolidProperty(solid));
+                break;
+            case LOD2:
+                cgmlGos.setLod2Solid(new SolidProperty(solid));
+                break;
+            case LOD3:
+                cgmlGos.setLod3Solid(new SolidProperty(solid));
+                break;
+            default:
+                throw new IllegalStateException("Cannot add " + geom.getLod() + " solid to buildings");
+        }
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        super.collectContainedErrors(errors);
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.collectContainedErrors(errors);
+        }
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearAllContainedCheckResults();
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.clearAllContainedCheckResults();
+        }
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        boolean hasError = super.containsError(checkIdentifier);
+        if (hasError) {
+            return true;
+        }
+        for (BoundarySurface bs : boundarySurfaceList) {
+            if (bs.containsError(checkIdentifier)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        boolean hasError = super.containsAnyError();
+        if (hasError) {
+            return true;
+        }
+        for (BoundarySurface bs : boundarySurfaceList) {
+            if (bs.containsAnyError()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void prepareForChecking() {
+        super.prepareForChecking();
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.prepareForChecking();
+        }
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        super.clearMetaInformation();
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.clearMetaInformation();
+        }
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        super.collectInstances(handler);
+        handler.addInstance(boundarySurfaceList);
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        GenericCityObject originalGos = (GenericCityObject) original;
+        for (BoundarySurface originalBs : originalGos.boundarySurfaceList) {
+            boundarySurfaceList.add(handler.getCopyInstance(originalBs));
+        }
+        cgmlGos = originalGos.cgmlGos;
+    }
+
+    @Override
+    public AbstractCityObject getGmlObject() {
+        return null;
+    }
+
+    @Override
+    public FeatureType getFeatureType() {
+        return FeatureType.GENERIC_CITY_OBJECT;
+    }
+
+    public List<BoundarySurface> getBoundarySurfaces() {
+        return boundarySurfaceList;
+    }
+
+    @Override
+    public void unsetGmlGeometries() {
+        cgmlGos.setLod1Solid(null);
+        cgmlGos.setLod2Solid(null);
+        cgmlGos.setLod3Solid(null);
+        cgmlGos.setLod2MultiSurface(null);
+        cgmlGos.setLod3MultiSurface(null);
+        for (BoundarySurface bs : boundarySurfaceList) {
+            bs.unsetGmlGeometries();
+        }
+    }
+
+    public void setGmlObject(org.citygml4j.core.model.generics.GenericOccupiedSpace gos) {
+        this.cgmlGos = gos;
+    }
+
+    public void addBoundarySurface(BoundarySurface bs) {
+        boundarySurfaceList.add(bs);
+        bs.setParent(this);
+    }
+
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new GenericCityObject();
+    }
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/Geometry.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,16 +18,6 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.Random;
-import java.util.Set;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
 import de.hft.stuttgart.citydoctor2.check.CheckError;
 import de.hft.stuttgart.citydoctor2.check.CheckId;
@@ -39,420 +29,423 @@ import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
 import de.hft.stuttgart.citydoctor2.utils.SerializablePair;
 
+import java.io.Serial;
+import java.util.*;
+import java.util.Map.Entry;
+
 /**
  * Representation of a geometry containing the polygons and edges
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class Geometry extends GmlElement {
 
-	private static final String FAILED_REMOVING_POLYGON = "Removing polygon %s but polygon is not in geometry";
-
-	@Serial
-	private static final long serialVersionUID = 2539031030917731575L;
-
-	private static final Random r = new Random();
-
-	private GeometryType type;
-	private final Lod lod;
-
-	private CityObject parent;
-
-	private final List<Polygon> polygons = new ArrayList<>(2);
-	private List<Edge> edges;
-	private Map<SerializablePair<Vertex, Vertex>, Edge> edgeMap;
-	private List<Vertex> vertices;
-
-	public Geometry(GeometryType type, Lod lod) {
-		this.lod = lod;
-		this.type = type;
-	}
-
-	void setParent(CityObject parent) {
-		this.parent = parent;
-	}
-
-	public CityObject getParent() {
-		return parent;
-	}
-
-	public void setType(GeometryType type) {
-		this.type = type;
-	}
-
-	public GeometryType getType() {
-		return type;
-	}
-
-	public Lod getLod() {
-		return lod;
-	}
-
-	public List<Polygon> getPolygons() {
-		return polygons;
-	}
-
-	public void addPolygon(Polygon cdPoly) {
-		polygons.add(cdPoly);
-		cdPoly.setParent(this);
-		// set part of boundary surface or building installation or both
-		if (parent instanceof BoundarySurface bs) {
-			cdPoly.setPartOfSurface(bs);
-			if (bs.getParent() instanceof Installation bi) {
-				cdPoly.setPartOfInstallation(bi);
-			}
-		} else if (parent instanceof Installation bi) {
-			cdPoly.setPartOfInstallation(bi);
-		}
-	}
-
-	public void updateEdges() {
-		edges = new ArrayList<>();
-		edgeMap = new HashMap<>();
-		Map<Edge, Edge> duplicacyMap = new HashMap<>();
-		for (Polygon p : polygons) {
-			LinearRing extRing = p.getExteriorRing();
-			createEdgesFromRing(duplicacyMap, p, extRing);
-			for (LinearRing inner : p.getInnerRings()) {
-				createEdgesFromRing(duplicacyMap, p, inner);
-			}
-		}
-	}
-
-	void anonymize() {
-		setGmlId(GmlId.generateId());
-		for (Polygon p : polygons) {
-			p.anonymize();
-		}
-		double minX = Double.MAX_VALUE;
-		double minY = Double.MAX_VALUE;
-		double minZ = Double.MAX_VALUE;
-		for (Vertex v : vertices) {
-			if (v.getX() < minX) {
-				minX = v.getX();
-			}
-			if (v.getY() < minY) {
-				minY = v.getY();
-			}
-			if (v.getZ() < minZ) {
-				minZ = v.getZ();
-			}
-		}
-		double varX = r.nextDouble() * 10;
-		double varY = r.nextDouble() * 10;
-		double varZ = r.nextDouble() * 10;
-		for (Vertex v : vertices) {
-			v.setX(v.getX() - minX + varX);
-			v.setY(v.getY() - minY + varY);
-			v.setZ(v.getZ() - minZ + varZ);
-		}
-	}
-
-	private void createEdgesFromRing(Map<Edge, Edge> duplicacyMap, Polygon p, LinearRing ring) {
-		if (ring == null) {
-			return;
-		}
-		// only go to size -1 as ring should be closed
-		for (int i = 0; i < ring.getVertices().size() - 1; i++) {
-			Vertex v0 = ring.getVertices().get(i);
-			Vertex v1 = ring.getVertices().get(i + 1);
-			Edge tempEdge = new Edge(v0, v1);
-			Edge e = duplicacyMap.get(tempEdge);
-			if (e == null) {
-				// no duplicate found, enter edges
-				Edge oppositeEdge = new Edge(v1, v0);
-				duplicacyMap.put(tempEdge, tempEdge);
-				duplicacyMap.put(oppositeEdge, tempEdge);
-				e = tempEdge;
-				edges.add(e);
-				edgeMap.put(new SerializablePair<>(v0, v1), e);
-				edgeMap.put(new SerializablePair<>(v1, v0), e);
-			} else {
-				e.addHalfEdge(v0, v1);
-			}
-			e.addAdjacentPolygon(p);
-			e.addAdjacentRing(ring);
-		}
-	}
-
-	public Vector3d getCenter() {
-		return calculateBoundingBox().getCenter();
-	}
-
-	/**
-	 * This will calculate two points where every other point in the geometry is
-	 * between those two. If the geometry does not contain points or is null, an
-	 * empty array is returned. This is considered an axis aligned bounding box.
-	 * Only the exterior rings of the polygons is used as inner rings should be
-	 * within the exterior or they are faulty.
-	 * 
-	 * @return an array of two points. The first contains the lowest coordinates,
-	 *         the second contains the highest coordinates
-	 */
-	public BoundingBox calculateBoundingBox() {
-		return BoundingBoxCalculator.calculateBoundingBox(polygons);
-	}
-
-	public double calculateVolume() {
-		double sum = 0;
-		Vector3d center = calculateBoundingBox().getCenter();
-		for (Polygon p : polygons) {
-			TesselatedPolygon tesselatedPolygon = p.tesselate();
-			for (Triangle3d t : tesselatedPolygon.getTriangles()) {
-				Vector3d p1 = t.getP1().minus(center);
-				Vector3d p2 = t.getP2().minus(center);
-				Vector3d p3 = t.getP3().minus(center);
-				sum += det(p1.getCoordinates(), p2.getCoordinates(), p3.getCoordinates());
-			}
-		}
-		return sum / 6d;
-	}
-
-	private double det(double[] a, double[] b, double[] c) {
-		return -c[0] * b[1] * a[2] + b[0] * c[1] * a[2] + c[0] * a[1] * b[2] - a[0] * c[1] * b[2] - b[0] * a[1] * c[2]
-				+ a[0] * b[1] * c[2];
-	}
-
-	@Override
-	public boolean containsError(CheckId checkIdentifier) {
-		boolean hasError = super.containsError(checkIdentifier);
-		if (hasError) {
-			return true;
-		}
-		for (Polygon p : polygons) {
-			if (p.containsError(checkIdentifier)) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	@Override
-	public void clearAllContainedCheckResults() {
-		super.clearCheckResults();
-		for (Polygon p : polygons) {
-			p.clearAllContainedCheckResults();
-		}
-	}
-
-	@Override
-	public void collectContainedErrors(List<CheckError> errors) {
-		super.collectContainedErrors(errors);
-		for (Polygon p : polygons) {
-			p.collectContainedErrors(errors);
-		}
-	}
-
-	@Override
-	public boolean containsAnyError() {
-		boolean hasError = super.containsAnyError();
-		if (hasError) {
-			return true;
-		}
-		for (Polygon p : polygons) {
-			if (p.containsAnyError()) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-		for (Polygon p : polygons) {
-			p.accept(c);
-		}
-	}
-
-	@Override
-	public String toString() {
-		return "Geometry [type=" + type + ", lod=" + lod + ", id=" + getGmlId() + "]";
-	}
-
-	public List<Vertex> getVertices() {
-		return vertices;
-	}
-
-	public List<Edge> getEdges() {
-		return edges;
-	}
-
-	public List<Edge> getEdgesAdjacentTo(Vertex v) {
-		List<Edge> adjacentEdges = new ArrayList<>();
-		for (Edge e : edges) {
-			if (e.getFrom() == v || e.getTo() == v) {
-				adjacentEdges.add(e);
-			}
-		}
-		return adjacentEdges;
-	}
-
-	public Edge getEdge(Vertex v1, Vertex v2) {
-		return edgeMap.get(new SerializablePair<>(v1, v2));
-	}
-
-	public void updateEdgesAndVertices() {
-		updateVertices();
-		updateEdges();
-	}
-
-	public void updateVertices() {
-		Set<Vertex> vertexSet = new HashSet<>();
-		for (Polygon p : getPolygons()) {
-			updateRing(vertexSet, p.getExteriorRing());
-			for (LinearRing inner : p.getInnerRings()) {
-				updateRing(vertexSet, inner);
-			}
-		}
-		vertices = new ArrayList<>(vertexSet);
-	}
-
-	private void updateRing(Set<Vertex> vertexSet, LinearRing ring) {
-		if (ring == null) {
-			return;
-		}
-		for (Vertex v : ring.getVertices()) {
-			if (vertexSet.add(v)) {
-				// new vertex, clear adjacent rings in case new rings have been added
-				v.clearAdjacentRings(this);
-			}
-			// add ring to adjacent rings of vertex
-			v.addAdjacentRing(ring, this);
-		}
-	}
-
-	void removePolygon(Polygon p) {
-		p.removeRings();
-		if (!polygons.remove(p)) {
-			throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
-		}
-		if (p.isLink()) {
-			Polygon original = p.getOriginal();
-			if (!original.getParent().polygons.remove(original)) {
-				throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
-			}
-		} else if (p.isLinkedTo()) {
-			Polygon link = p.getLinkedFromPolygon();
-			if (!link.getParent().polygons.remove(link)) {
-				throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
-			}
-		}
-	}
-
-	public void replacePolygon(Polygon p, ConcretePolygon... polygons) {
-		removePolygon(p);
-		if (p.isLink()) {
-			Geometry geom2 = p.getOriginal().getParent();
-			for (ConcretePolygon newPoly : polygons) {
-				geom2.addPolygon(newPoly);
-				addPolygon(new LinkedPolygon(newPoly, this));
-			}
-		} else if (p.isLinkedTo()) {
-			Geometry geom2 = p.getLinkedFromPolygon().getParent();
-			for (ConcretePolygon newPoly : polygons) {
-				addPolygon(newPoly);
-				geom2.addPolygon(new LinkedPolygon(newPoly, geom2));
-			}
-		} else {
-			for (Polygon newPoly : polygons) {
-				addPolygon(newPoly);
-			}
-		}
-
-	}
-
-	public List<Edge> getEdgesAdjacentTo(Polygon p) {
-		List<Edge> list = new ArrayList<>();
-		for (Edge e : edges) {
-			if (e.getAdjacentPolygons().contains(p)) {
-				list.add(e);
-			}
-		}
-		return list;
-	}
-
-	public boolean containsPolygon(Polygon other) {
-		for (Polygon p : polygons) {
-			if (p.getGmlId().equals(other.getGmlId())) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	@Override
-	public void prepareForChecking() {
-		updateEdgesAndVertices();
-	}
-
-	@Override
-	public void clearMetaInformation() {
-		if (vertices != null) {
-			for (Vertex v : vertices) {
-				v.clearAdjacentRings();
-			}
-			vertices = null;
-		}
-		edges = null;
-		edgeMap = null;
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		handler.addInstance(parent);
-		handler.addInstance(polygons);
-		handler.addInstance(edges);
-		handler.addInstance(vertices);
-		if (edgeMap != null) {
-			for (Entry<SerializablePair<Vertex, Vertex>, Edge> e : edgeMap.entrySet()) {
-				handler.addInstance(e.getKey().getValue0());
-				handler.addInstance(e.getKey().getValue1());
-				handler.addInstance(e.getValue());
-			}
-		}
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new Geometry(type, lod);
-	}
-
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		super.fillValues(original, handler);
-		Geometry originalGeometry = (Geometry) original;
-		for (Polygon originalPoly : originalGeometry.polygons) {
-			polygons.add(handler.getCopyInstance(originalPoly));
-		}
-		if (originalGeometry.edges != null) {
-			edges = new ArrayList<>(originalGeometry.edges.size());
-			for (Edge originalEdge : originalGeometry.edges) {
-				edges.add(handler.getCopyInstance(originalEdge));
-			}
-		}
-		if (originalGeometry.edgeMap != null) {
-			edgeMap = new HashMap<>(originalGeometry.edgeMap.size());
-			for (Entry<SerializablePair<Vertex, Vertex>, Edge> originalEntry : originalGeometry.edgeMap.entrySet()) {
-				Vertex copyV0 = handler.getCopyInstance(originalEntry.getKey().getValue0());
-				Vertex copyV1 = handler.getCopyInstance(originalEntry.getKey().getValue1());
-				SerializablePair<Vertex, Vertex> pair = new SerializablePair<>(copyV0, copyV1);
-				Edge copyEdge = handler.getCopyInstance(originalEntry.getValue());
-				edgeMap.put(pair, copyEdge);
-			}
-		}
-		if (originalGeometry.vertices != null) {
-			vertices = new ArrayList<>(originalGeometry.vertices.size());
-			for (Vertex originalVertex : originalGeometry.vertices) {
-				vertices.add(handler.getCopyInstance(originalVertex));
-			}
-		}
-		parent = handler.getCopyInstance(originalGeometry.parent);
-
-	}
+    private static final String FAILED_REMOVING_POLYGON = "Removing polygon %s but polygon is not in geometry";
+
+    @Serial
+    private static final long serialVersionUID = 2539031030917731575L;
+
+    private static final Random r = new Random();
+
+    private GeometryType type;
+    private final Lod lod;
+
+    private CityObject parent;
+
+    private final List<Polygon> polygons = new ArrayList<>(2);
+    private List<Edge> edges;
+    private Map<SerializablePair<Vertex, Vertex>, Edge> edgeMap;
+    private List<Vertex> vertices;
+
+    public Geometry(GeometryType type, Lod lod) {
+        this.lod = lod;
+        this.type = type;
+    }
+
+    void setParent(CityObject parent) {
+        this.parent = parent;
+    }
+
+    public CityObject getParent() {
+        return parent;
+    }
+
+    public void setType(GeometryType type) {
+        this.type = type;
+    }
+
+    public GeometryType getType() {
+        return type;
+    }
+
+    public Lod getLod() {
+        return lod;
+    }
+
+    public List<Polygon> getPolygons() {
+        return polygons;
+    }
+
+    public void addPolygon(Polygon cdPoly) {
+        polygons.add(cdPoly);
+        cdPoly.setParent(this);
+        // set part of boundary surface or building installation or both
+        if (parent instanceof BoundarySurface bs) {
+            cdPoly.setPartOfSurface(bs);
+            if (bs.getParent() instanceof Installation bi) {
+                cdPoly.setPartOfInstallation(bi);
+            }
+        } else if (parent instanceof Installation bi) {
+            cdPoly.setPartOfInstallation(bi);
+        }
+    }
+
+    public void updateEdges() {
+        edges = new ArrayList<>();
+        edgeMap = new HashMap<>();
+        Map<Edge, Edge> duplicacyMap = new HashMap<>();
+        for (Polygon p : polygons) {
+            LinearRing extRing = p.getExteriorRing();
+            createEdgesFromRing(duplicacyMap, p, extRing);
+            for (LinearRing inner : p.getInnerRings()) {
+                createEdgesFromRing(duplicacyMap, p, inner);
+            }
+        }
+    }
+
+    void anonymize() {
+        setGmlId(GmlId.generateId());
+        for (Polygon p : polygons) {
+            p.anonymize();
+        }
+        double minX = Double.MAX_VALUE;
+        double minY = Double.MAX_VALUE;
+        double minZ = Double.MAX_VALUE;
+        for (Vertex v : vertices) {
+            if (v.getX() < minX) {
+                minX = v.getX();
+            }
+            if (v.getY() < minY) {
+                minY = v.getY();
+            }
+            if (v.getZ() < minZ) {
+                minZ = v.getZ();
+            }
+        }
+        double varX = r.nextDouble() * 10;
+        double varY = r.nextDouble() * 10;
+        double varZ = r.nextDouble() * 10;
+        for (Vertex v : vertices) {
+            v.setX(v.getX() - minX + varX);
+            v.setY(v.getY() - minY + varY);
+            v.setZ(v.getZ() - minZ + varZ);
+        }
+    }
+
+    private void createEdgesFromRing(Map<Edge, Edge> duplicacyMap, Polygon p, LinearRing ring) {
+        if (ring == null) {
+            return;
+        }
+        // only go to size -1 as ring should be closed
+        for (int i = 0; i < ring.getVertices().size() - 1; i++) {
+            Vertex v0 = ring.getVertices().get(i);
+            Vertex v1 = ring.getVertices().get(i + 1);
+            Edge tempEdge = new Edge(v0, v1);
+            Edge e = duplicacyMap.get(tempEdge);
+            if (e == null) {
+                // no duplicate found, enter edges
+                Edge oppositeEdge = new Edge(v1, v0);
+                duplicacyMap.put(tempEdge, tempEdge);
+                duplicacyMap.put(oppositeEdge, tempEdge);
+                e = tempEdge;
+                edges.add(e);
+                edgeMap.put(new SerializablePair<>(v0, v1), e);
+                edgeMap.put(new SerializablePair<>(v1, v0), e);
+            } else {
+                e.addHalfEdge(v0, v1);
+            }
+            e.addAdjacentPolygon(p);
+            e.addAdjacentRing(ring);
+        }
+    }
+
+    public Vector3d getCenter() {
+        return calculateBoundingBox().getCenter();
+    }
+
+    /**
+     * This will calculate two points where every other point in the geometry is
+     * between those two. If the geometry does not contain points or is null, an
+     * empty array is returned. This is considered an axis aligned bounding box.
+     * Only the exterior rings of the polygons is used as inner rings should be
+     * within the exterior or they are faulty.
+     *
+     * @return an array of two points. The first contains the lowest coordinates,
+     * the second contains the highest coordinates
+     */
+    public BoundingBox calculateBoundingBox() {
+        return BoundingBoxCalculator.calculateBoundingBox(polygons);
+    }
+
+    public double calculateVolume() {
+        double sum = 0;
+        Vector3d center = calculateBoundingBox().getCenter();
+        for (Polygon p : polygons) {
+            TesselatedPolygon tesselatedPolygon = p.tesselate();
+            for (Triangle3d t : tesselatedPolygon.getTriangles()) {
+                Vector3d p1 = t.getP1().minus(center);
+                Vector3d p2 = t.getP2().minus(center);
+                Vector3d p3 = t.getP3().minus(center);
+                sum += det(p1.getCoordinates(), p2.getCoordinates(), p3.getCoordinates());
+            }
+        }
+        return sum / 6d;
+    }
+
+    private double det(double[] a, double[] b, double[] c) {
+        return -c[0] * b[1] * a[2] + b[0] * c[1] * a[2] + c[0] * a[1] * b[2] - a[0] * c[1] * b[2] - b[0] * a[1] * c[2]
+                + a[0] * b[1] * c[2];
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        boolean hasError = super.containsError(checkIdentifier);
+        if (hasError) {
+            return true;
+        }
+        for (Polygon p : polygons) {
+            if (p.containsError(checkIdentifier)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearCheckResults();
+        for (Polygon p : polygons) {
+            p.clearAllContainedCheckResults();
+        }
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        super.collectContainedErrors(errors);
+        for (Polygon p : polygons) {
+            p.collectContainedErrors(errors);
+        }
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        boolean hasError = super.containsAnyError();
+        if (hasError) {
+            return true;
+        }
+        for (Polygon p : polygons) {
+            if (p.containsAnyError()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+        for (Polygon p : polygons) {
+            p.accept(c);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Geometry [type=" + type + ", lod=" + lod + ", id=" + getGmlId() + "]";
+    }
+
+    public List<Vertex> getVertices() {
+        return vertices;
+    }
+
+    public List<Edge> getEdges() {
+        return edges;
+    }
+
+    public List<Edge> getEdgesAdjacentTo(Vertex v) {
+        List<Edge> adjacentEdges = new ArrayList<>();
+        for (Edge e : edges) {
+            if (e.getFrom() == v || e.getTo() == v) {
+                adjacentEdges.add(e);
+            }
+        }
+        return adjacentEdges;
+    }
+
+    public Edge getEdge(Vertex v1, Vertex v2) {
+        return edgeMap.get(new SerializablePair<>(v1, v2));
+    }
+
+    public void updateEdgesAndVertices() {
+        updateVertices();
+        updateEdges();
+    }
+
+    public void updateVertices() {
+        Set<Vertex> vertexSet = new HashSet<>();
+        for (Polygon p : getPolygons()) {
+            updateRing(vertexSet, p.getExteriorRing());
+            for (LinearRing inner : p.getInnerRings()) {
+                updateRing(vertexSet, inner);
+            }
+        }
+        vertices = new ArrayList<>(vertexSet);
+    }
+
+    private void updateRing(Set<Vertex> vertexSet, LinearRing ring) {
+        if (ring == null) {
+            return;
+        }
+        for (Vertex v : ring.getVertices()) {
+            if (vertexSet.add(v)) {
+                // new vertex, clear adjacent rings in case new rings have been added
+                v.clearAdjacentRings(this);
+            }
+            // add ring to adjacent rings of vertex
+            v.addAdjacentRing(ring, this);
+        }
+    }
+
+    void removePolygon(Polygon p) {
+        p.removeRings();
+        if (!polygons.remove(p)) {
+            throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
+        }
+        if (p.isLink()) {
+            Polygon original = p.getOriginal();
+            if (!original.getParent().polygons.remove(original)) {
+                throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
+            }
+        } else if (p.isLinkedTo()) {
+            Polygon link = p.getLinkedFromPolygon();
+            if (!link.getParent().polygons.remove(link)) {
+                throw new IllegalStateException(String.format(FAILED_REMOVING_POLYGON, p));
+            }
+        }
+    }
+
+    public void replacePolygon(Polygon p, ConcretePolygon... polygons) {
+        removePolygon(p);
+        if (p.isLink()) {
+            Geometry geom2 = p.getOriginal().getParent();
+            for (ConcretePolygon newPoly : polygons) {
+                geom2.addPolygon(newPoly);
+                addPolygon(new LinkedPolygon(newPoly, this));
+            }
+        } else if (p.isLinkedTo()) {
+            Geometry geom2 = p.getLinkedFromPolygon().getParent();
+            for (ConcretePolygon newPoly : polygons) {
+                addPolygon(newPoly);
+                geom2.addPolygon(new LinkedPolygon(newPoly, geom2));
+            }
+        } else {
+            for (Polygon newPoly : polygons) {
+                addPolygon(newPoly);
+            }
+        }
+
+    }
+
+    public List<Edge> getEdgesAdjacentTo(Polygon p) {
+        List<Edge> list = new ArrayList<>();
+        for (Edge e : edges) {
+            if (e.getAdjacentPolygons().contains(p)) {
+                list.add(e);
+            }
+        }
+        return list;
+    }
+
+    public boolean containsPolygon(Polygon other) {
+        for (Polygon p : polygons) {
+            if (p.getGmlId().equals(other.getGmlId())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void prepareForChecking() {
+        updateEdgesAndVertices();
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        if (vertices != null) {
+            for (Vertex v : vertices) {
+                v.clearAdjacentRings();
+            }
+            vertices = null;
+        }
+        edges = null;
+        edgeMap = null;
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        handler.addInstance(parent);
+        handler.addInstance(polygons);
+        handler.addInstance(edges);
+        handler.addInstance(vertices);
+        if (edgeMap != null) {
+            for (Entry<SerializablePair<Vertex, Vertex>, Edge> e : edgeMap.entrySet()) {
+                handler.addInstance(e.getKey().getValue0());
+                handler.addInstance(e.getKey().getValue1());
+                handler.addInstance(e.getValue());
+            }
+        }
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new Geometry(type, lod);
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        Geometry originalGeometry = (Geometry) original;
+        for (Polygon originalPoly : originalGeometry.polygons) {
+            polygons.add(handler.getCopyInstance(originalPoly));
+        }
+        if (originalGeometry.edges != null) {
+            edges = new ArrayList<>(originalGeometry.edges.size());
+            for (Edge originalEdge : originalGeometry.edges) {
+                edges.add(handler.getCopyInstance(originalEdge));
+            }
+        }
+        if (originalGeometry.edgeMap != null) {
+            edgeMap = new HashMap<>(originalGeometry.edgeMap.size());
+            for (Entry<SerializablePair<Vertex, Vertex>, Edge> originalEntry : originalGeometry.edgeMap.entrySet()) {
+                Vertex copyV0 = handler.getCopyInstance(originalEntry.getKey().getValue0());
+                Vertex copyV1 = handler.getCopyInstance(originalEntry.getKey().getValue1());
+                SerializablePair<Vertex, Vertex> pair = new SerializablePair<>(copyV0, copyV1);
+                Edge copyEdge = handler.getCopyInstance(originalEntry.getValue());
+                edgeMap.put(pair, copyEdge);
+            }
+        }
+        if (originalGeometry.vertices != null) {
+            vertices = new ArrayList<>(originalGeometry.vertices.size());
+            for (Vertex originalVertex : originalGeometry.vertices) {
+                vertices.add(handler.getCopyInstance(originalVertex));
+            }
+        }
+        parent = handler.getCopyInstance(originalGeometry.parent);
+
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GeometryType.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -20,12 +20,11 @@ package de.hft.stuttgart.citydoctor2.datastructure;
 
 /**
  * Available geometry types
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public enum GeometryType {
 
-	MULTI_SURFACE, SOLID, COMPOSITE_SURFACE
+    MULTI_SURFACE, SOLID, COMPOSITE_SURFACE
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlElement.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -26,38 +26,37 @@ import java.io.Serial;
 
 /**
  * A general GML element that has a gml id
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public abstract class GmlElement extends Checkable implements Copyable {
 
-	@Serial
-	private static final long serialVersionUID = -3242505393303017359L;
-
-	private GmlId gmlId;
-
-	public void setGmlId(GmlId id) {
-		gmlId = id;
-	}
-
-	@Override
-	public GmlId getGmlId() {
-		if (gmlId == null) {
-			gmlId = GmlId.generateId();
-		}
-		return gmlId;
-	}
-	
-	public boolean hasExistingGmlId() {
-		return gmlId != null && !gmlId.isGenerated();
-	}
-	
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		GmlElement originalElement = (GmlElement) original;
-		// generate gml id before copying
-		gmlId = originalElement.getGmlId();
-	}
-	
+    @Serial
+    private static final long serialVersionUID = -3242505393303017359L;
+
+    private GmlId gmlId;
+
+    public void setGmlId(GmlId id) {
+        gmlId = id;
+    }
+
+    @Override
+    public GmlId getGmlId() {
+        if (gmlId == null) {
+            gmlId = GmlId.generateId();
+        }
+        return gmlId;
+    }
+
+    public boolean hasExistingGmlId() {
+        return gmlId != null && !gmlId.isGenerated();
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        GmlElement originalElement = (GmlElement) original;
+        // generate gml id before copying
+        gmlId = originalElement.getGmlId();
+    }
+
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlId.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -25,83 +25,82 @@ import java.util.concurrent.atomic.AtomicInteger;
 /**
  * Represents a GML id. Additionally contains information whether this id was
  * generated by city doctor
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class GmlId implements Serializable {
 
-	@Serial
-	private static final long serialVersionUID = 4273817255150972966L;
+    @Serial
+    private static final long serialVersionUID = 4273817255150972966L;
 
-	/* prefixes for generation */
-	private static final String GENERAL_GEN = "CityDoctor_%d_%d";
-	private static final AtomicInteger ID_COUNTER = new AtomicInteger();
+    /* prefixes for generation */
+    private static final String GENERAL_GEN = "CityDoctor_%d_%d";
+    private static final AtomicInteger ID_COUNTER = new AtomicInteger();
 
-	private final String gmlString;
-	private final boolean generated;
+    private final String gmlString;
+    private final boolean generated;
 
-	public GmlId(String gmlId) {
-		this(gmlId, false);
-	}
+    public GmlId(String gmlId) {
+        this(gmlId, false);
+    }
 
-	private GmlId(String gmlId, boolean generated) {
-		if (gmlId == null || gmlId.isEmpty()) {
-			throw new IllegalArgumentException("GmlId may not be null or empty. If no GmlId is given generate one");
-		}
-		this.gmlString = gmlId;
-		this.generated = generated;
-	}
+    private GmlId(String gmlId, boolean generated) {
+        if (gmlId == null || gmlId.isEmpty()) {
+            throw new IllegalArgumentException("GmlId may not be null or empty. If no GmlId is given generate one");
+        }
+        this.gmlString = gmlId;
+        this.generated = generated;
+    }
 
-	@Override
-	public String toString() {
-		return gmlString;
-	}
+    @Override
+    public String toString() {
+        return gmlString;
+    }
 
-	public String getGmlString() {
-		return gmlString;
-	}
+    public String getGmlString() {
+        return gmlString;
+    }
 
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + (generated ? 1231 : 1237);
-		result = prime * result + ((gmlString == null) ? 0 : gmlString.hashCode());
-		return result;
-	}
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (generated ? 1231 : 1237);
+        result = prime * result + ((gmlString == null) ? 0 : gmlString.hashCode());
+        return result;
+    }
 
-	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
-			return true;
-		}
-		if (obj == null) {
-			return false;
-		}
-		if (getClass() != obj.getClass()) {
-			return false;
-		}
-		GmlId other = (GmlId) obj;
-		if (generated != other.generated) {
-			return false;
-		}
-		if (gmlString == null) {
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        GmlId other = (GmlId) obj;
+        if (generated != other.generated) {
+            return false;
+        }
+        if (gmlString == null) {
             return other.gmlString == null;
-		} else return gmlString.equals(other.gmlString);
+        } else return gmlString.equals(other.gmlString);
     }
 
-	/**
-	 * Determines if the GML-ID was generated by CityDoctor or not.
-	 * 
-	 * @return True if it was generated, otherwise false.
-	 */
-	public boolean isGenerated() {
-		return generated;
-	}
+    /**
+     * Determines if the GML-ID was generated by CityDoctor or not.
+     *
+     * @return True if it was generated, otherwise false.
+     */
+    public boolean isGenerated() {
+        return generated;
+    }
 
-	public static GmlId generateId() {
-		return new GmlId(String.format(GENERAL_GEN, System.currentTimeMillis(), ID_COUNTER.getAndIncrement()), true);
-	}
+    public static GmlId generateId() {
+        return new GmlId(String.format(GENERAL_GEN, System.currentTimeMillis(), ID_COUNTER.getAndIncrement()), true);
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/ImplicitGeometryHolder.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.check.CheckError;
+import de.hft.stuttgart.citydoctor2.check.CheckId;
+import de.hft.stuttgart.citydoctor2.math.TransformationMatrix;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.citygml4j.core.model.core.ImplicitGeometry;
+
+import java.io.Serial;
+import java.util.List;
+
+/**
+ * Datastructure for representation and resolving of implicit geometries
+ *
+ * @author Riegel
+ */
+public class ImplicitGeometryHolder extends Geometry {
+
+    private static final Logger logger = LogManager.getLogger(ImplicitGeometryHolder.class);
+    @Serial
+    private static final long serialVersionUID = -8938931081577196349L;
+
+    private ImplicitGeometry cgmlImplicitGeometry = null;
+
+    private final PrototypeGeometryType type;
+    private final Geometry prototypeGeometry;
+
+    public ImplicitGeometryHolder(ImplicitGeometry cgmlImplicitGeometry, LibraryObject libObject) {
+        super(libObject.getType(), libObject.getLod());
+        prototypeGeometry = libObject;
+        type = PrototypeGeometryType.LIBRARY_OBJECT;
+        this.cgmlImplicitGeometry = cgmlImplicitGeometry;
+        applyTransformation();
+    }
+
+    public ImplicitGeometryHolder(ImplicitGeometry cgmlImplicitGeometry, RelativeGeometry relativeGeometry) {
+        super(relativeGeometry.getType(), relativeGeometry.getLod());
+        prototypeGeometry = relativeGeometry;
+        type = PrototypeGeometryType.RELATIVE_GEOMETRY;
+        this.cgmlImplicitGeometry = cgmlImplicitGeometry;
+        applyTransformation();
+    }
+
+
+    /**
+     * Applies the transformation matrix of the implicit geometry to a copy of the reference geometry and copies the resulting
+     * transformed geometry into this object.
+     */
+    private void applyTransformation() {
+        TransformationMatrix transformMatrix = new TransformationMatrix(cgmlImplicitGeometry);
+        Geometry transformedGeom = transformMatrix.transformGeometry(prototypeGeometry);
+        transformedGeom.getPolygons().forEach(this::addPolygon);
+        this.updateEdgesAndVertices();
+    }
+
+    public PrototypeGeometryType getPrototypeGeometryType() {
+        return type;
+    }
+
+    @Override
+    public void accept(Check c) {
+        prototypeGeometry.accept(c);
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        return prototypeGeometry.containsError(checkIdentifier);
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        prototypeGeometry.clearAllContainedCheckResults();
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        prototypeGeometry.clearAllContainedCheckResults();
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        return prototypeGeometry.containsAnyError();
+    }
+
+    @Override
+    public void prepareForChecking() {
+        this.updateEdgesAndVertices();
+        prototypeGeometry.prepareForChecking();
+    }
+
+    @Override
+    public boolean isValidated() {
+        return prototypeGeometry.isValidated();
+    }
+
+    public enum PrototypeGeometryType {
+        LIBRARY_OBJECT, RELATIVE_GEOMETRY
+    }
+
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/Installation.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,10 +18,13 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.ArrayList;
-import java.util.List;
-
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.check.CheckError;
+import de.hft.stuttgart.citydoctor2.check.CheckId;
+import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
+import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
+import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
+import de.hft.stuttgart.citydoctor2.utils.Copyable;
 import org.citygml4j.core.model.bridge.BridgeInstallation;
 import org.citygml4j.core.model.construction.AbstractInstallation;
 import org.citygml4j.core.model.core.AbstractSpaceBoundaryProperty;
@@ -32,252 +35,248 @@ import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
 import org.xmlobjects.gml.model.geometry.complexes.CompositeSurface;
 import org.xmlobjects.gml.model.geometry.primitives.SurfaceProperty;
 
-import de.hft.stuttgart.citydoctor2.check.Check;
-import de.hft.stuttgart.citydoctor2.check.CheckError;
-import de.hft.stuttgart.citydoctor2.check.CheckId;
-import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
-import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
-import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
-import de.hft.stuttgart.citydoctor2.utils.Copyable;
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.List;
 
 public class Installation extends CityObject {
 
-	@Serial
-	private static final long serialVersionUID = 1576237433322680191L;
-
-	private List<BoundarySurface> boundarySurfaces = new ArrayList<>(4);
-
-	private AbstractInstallation gmlBi;
-
-	private CityObject parent;
-	
-	public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
-		for (Geometry geom : getGeometries()) {
-			if (geom.getType() == GeometryType.MULTI_SURFACE) {
-				MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
-				if (ms != null) {
-					setGeometryAccordingToLod(geom.getLod(), new MultiSurfaceProperty(ms));
-				}
-			} else if (geom.getType() == GeometryType.COMPOSITE_SURFACE) {
-				CompositeSurface cs = CityGmlUtils.createCompositeSurface(geom, factory, config);
-				if (cs != null) {
-					setGeometryAccordingToLod(geom.getLod(), new SurfaceProperty(cs));
-				}
-			} else {
-				throw new IllegalStateException("BuildingInstallation not have Solid geometries");
-			}
-		}
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.reCreateGeometries(factory, config);
-		}
-	}	
-	
-	private void setGeometryAccordingToLod(Lod lod, GeometryProperty<?> ms) {
-		if (gmlBi instanceof org.citygml4j.core.model.building.BuildingInstallation localBi) {
-			addGeometryToBuildingInstallation(lod, ms, localBi);
-		} else if (gmlBi instanceof BridgeInstallation localBi) {
-			addGeometryToBridgeInstallation(lod, ms, localBi);
-		}
-	}
-
-	private void addGeometryToBuildingInstallation(Lod lod, GeometryProperty<?> ms,
-			org.citygml4j.core.model.building.BuildingInstallation localBi) {
-		switch (lod) {
-		case LOD2:
-			localBi.getDeprecatedProperties().setLod2Geometry(ms);
-			break;
-		case LOD3:
-			localBi.getDeprecatedProperties().setLod3Geometry(ms);
-			break;
-		case LOD4:
-			localBi.getDeprecatedProperties().setLod4Geometry(ms);
-			break;
-		default:
-			throw new IllegalStateException("Found geometry with LOD other than LOD2,"
-					+ " LOD3, LOD4, which is illegal for BuildingInstallations: " + lod);
-		}
-	}
-
-	private void addGeometryToBridgeInstallation(Lod lod, GeometryProperty<?> ms, BridgeInstallation localBi) {
-		switch (lod) {
-		case LOD2:
-			localBi.getDeprecatedProperties().setLod2Geometry(ms);
-			break;
-		case LOD3:
-			localBi.getDeprecatedProperties().setLod3Geometry(ms);
-			break;
-		case LOD4:
-			localBi.getDeprecatedProperties().setLod4Geometry(ms);
-			break;
-		default:
-			throw new IllegalStateException("Found geometry with LOD other than LOD2,"
-					+ " LOD3, LOD4, which is illegal for BuildingInstallations: " + lod);
-		}
-	}
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.accept(c);
-		}
-	}
-	
-	@Override
-	public void clearAllContainedCheckResults() {
-		super.clearAllContainedCheckResults();
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.clearAllContainedCheckResults();
-		}
-	}
-	
-	@Override
-	public void collectContainedErrors(List<CheckError> errors) {
-		super.collectContainedErrors(errors);
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.collectContainedErrors(errors);
-		}
-	}
-	
-	@Override
-	public boolean containsAnyError() {
-		boolean hasError = super.containsAnyError();
-		if (hasError) {
-			return true;
-		}
-		for (BoundarySurface bs : boundarySurfaces) {
-			if (bs.containsAnyError()) {
-				return true;
-			}
-		}
-		return false;
-	}
-	
-	@Override
-	public boolean containsError(CheckId checkIdentifier) {
-		boolean hasError = super.containsError(checkIdentifier);
-		if (hasError) {
-			return true;
-		}
-		for (BoundarySurface bs : boundarySurfaces) {
-			if (bs.containsError(checkIdentifier)) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	public void setParent(CityObject parent) {
-		this.parent = parent;
-	}
-	
-	public CityObject getParent() {
-		return parent;
-	}
-
-	public void addBoundarySurface(BoundarySurface bs) {
-		boundarySurfaces.add(bs);
-		bs.setParent(this);
-	}
-
-	public void unsetGmlGeometries() {
-		if (gmlBi instanceof org.citygml4j.core.model.building.BuildingInstallation localBi) {
-			localBi.getDeprecatedProperties().setLod2Geometry(null);
-			localBi.getDeprecatedProperties().setLod3Geometry(null);
-			localBi.getDeprecatedProperties().setLod4Geometry(null);
-		} else if (gmlBi instanceof BridgeInstallation localBi) {
-			removeGeometriesFromBridgeInstallation(localBi);
-		}
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.unsetGmlGeometries();
-		}
-	}
-
-	private void removeGeometriesFromBridgeInstallation(BridgeInstallation localBi) {
-		localBi.getDeprecatedProperties().setLod2Geometry(null);
-		localBi.getDeprecatedProperties().setLod3Geometry(null);
-		localBi.getDeprecatedProperties().setLod4Geometry(null);
-	}
-
-	public void setGmlObject(AbstractInstallation gmlBi) {
-		this.gmlBi = gmlBi;
-	}
-
-	@Override
-	public String toString() {
-		return "BuildingInstallation [id=" + getGmlId() + "]";
-	}
-
-	void anonymize() {
-		setGmlId(GmlId.generateId());
-		gmlBi = new org.citygml4j.core.model.building.BuildingInstallation();
-		gmlBi.setId(getGmlId().getGmlString());
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.anonymize();
-			gmlBi.getBoundaries().add(new AbstractSpaceBoundaryProperty(bs.getGmlObject()));
-		}
-	}
-	
-
-	@Override
-	public AbstractInstallation getGmlObject() {
-		return gmlBi;
-	}
-
-	@Override
-	public FeatureType getFeatureType() {
-		return FeatureType.INSTALLATION;
-	}
-
-	public List<BoundarySurface> getBoundarySurfaces() {
-		if (boundarySurfaces == null) {
-			boundarySurfaces = new ArrayList<>(4);
-		}
-		return boundarySurfaces;
-	}
-	
-	@Override
-	public void clearMetaInformation() {
-		super.clearMetaInformation();
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.clearMetaInformation();
-		}
-	}
-	
-	@Override
-	public void prepareForChecking() {
-		super.prepareForChecking();
-		for (BoundarySurface bs : boundarySurfaces) {
-			bs.prepareForChecking();
-		}
-	}
-	
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		super.fillValues(original, handler);
-		Installation originalBi = (Installation) original;
-		for (BoundarySurface originalBs : originalBi.boundarySurfaces) {
-			boundarySurfaces.add(handler.getCopyInstance(originalBs));
-		}
-		gmlBi = originalBi.gmlBi;
-		parent = handler.getCopyInstance(parent);
-	}
-	
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		super.collectInstances(handler);
-		for (BoundarySurface bs : boundarySurfaces) {
-			handler.addInstance(bs);
-		}
-		handler.addInstance(parent);
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new Installation();
-	}
+    @Serial
+    private static final long serialVersionUID = 1576237433322680191L;
+
+    private List<BoundarySurface> boundarySurfaces = new ArrayList<>(4);
+
+    private AbstractInstallation gmlBi;
+
+    private CityObject parent;
+
+    public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
+        for (Geometry geom : getGeometries()) {
+            if (geom.getType() == GeometryType.MULTI_SURFACE) {
+                MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
+                if (ms != null) {
+                    setGeometryAccordingToLod(geom.getLod(), new MultiSurfaceProperty(ms));
+                }
+            } else if (geom.getType() == GeometryType.COMPOSITE_SURFACE) {
+                CompositeSurface cs = CityGmlUtils.createCompositeSurface(geom, factory, config);
+                if (cs != null) {
+                    setGeometryAccordingToLod(geom.getLod(), new SurfaceProperty(cs));
+                }
+            } else {
+                throw new IllegalStateException("BuildingInstallation not have Solid geometries");
+            }
+        }
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.reCreateGeometries(factory, config);
+        }
+    }
+
+    private void setGeometryAccordingToLod(Lod lod, GeometryProperty<?> ms) {
+        if (gmlBi instanceof org.citygml4j.core.model.building.BuildingInstallation localBi) {
+            addGeometryToBuildingInstallation(lod, ms, localBi);
+        } else if (gmlBi instanceof BridgeInstallation localBi) {
+            addGeometryToBridgeInstallation(lod, ms, localBi);
+        }
+    }
+
+    private void addGeometryToBuildingInstallation(Lod lod, GeometryProperty<?> ms,
+                                                   org.citygml4j.core.model.building.BuildingInstallation localBi) {
+        switch (lod) {
+            case LOD2:
+                localBi.getDeprecatedProperties().setLod2Geometry(ms);
+                break;
+            case LOD3:
+                localBi.getDeprecatedProperties().setLod3Geometry(ms);
+                break;
+            case LOD4:
+                localBi.getDeprecatedProperties().setLod4Geometry(ms);
+                break;
+            default:
+                throw new IllegalStateException("Found geometry with LOD other than LOD2,"
+                        + " LOD3, LOD4, which is illegal for BuildingInstallations: " + lod);
+        }
+    }
+
+    private void addGeometryToBridgeInstallation(Lod lod, GeometryProperty<?> ms, BridgeInstallation localBi) {
+        switch (lod) {
+            case LOD2:
+                localBi.getDeprecatedProperties().setLod2Geometry(ms);
+                break;
+            case LOD3:
+                localBi.getDeprecatedProperties().setLod3Geometry(ms);
+                break;
+            case LOD4:
+                localBi.getDeprecatedProperties().setLod4Geometry(ms);
+                break;
+            default:
+                throw new IllegalStateException("Found geometry with LOD other than LOD2,"
+                        + " LOD3, LOD4, which is illegal for BuildingInstallations: " + lod);
+        }
+    }
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.accept(c);
+        }
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearAllContainedCheckResults();
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.clearAllContainedCheckResults();
+        }
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        super.collectContainedErrors(errors);
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.collectContainedErrors(errors);
+        }
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        boolean hasError = super.containsAnyError();
+        if (hasError) {
+            return true;
+        }
+        for (BoundarySurface bs : boundarySurfaces) {
+            if (bs.containsAnyError()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        boolean hasError = super.containsError(checkIdentifier);
+        if (hasError) {
+            return true;
+        }
+        for (BoundarySurface bs : boundarySurfaces) {
+            if (bs.containsError(checkIdentifier)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public void setParent(CityObject parent) {
+        this.parent = parent;
+    }
+
+    public CityObject getParent() {
+        return parent;
+    }
+
+    public void addBoundarySurface(BoundarySurface bs) {
+        boundarySurfaces.add(bs);
+        bs.setParent(this);
+    }
+
+    public void unsetGmlGeometries() {
+        if (gmlBi instanceof org.citygml4j.core.model.building.BuildingInstallation localBi) {
+            localBi.getDeprecatedProperties().setLod2Geometry(null);
+            localBi.getDeprecatedProperties().setLod3Geometry(null);
+            localBi.getDeprecatedProperties().setLod4Geometry(null);
+        } else if (gmlBi instanceof BridgeInstallation localBi) {
+            removeGeometriesFromBridgeInstallation(localBi);
+        }
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.unsetGmlGeometries();
+        }
+    }
+
+    private void removeGeometriesFromBridgeInstallation(BridgeInstallation localBi) {
+        localBi.getDeprecatedProperties().setLod2Geometry(null);
+        localBi.getDeprecatedProperties().setLod3Geometry(null);
+        localBi.getDeprecatedProperties().setLod4Geometry(null);
+    }
+
+    public void setGmlObject(AbstractInstallation gmlBi) {
+        this.gmlBi = gmlBi;
+    }
+
+    @Override
+    public String toString() {
+        return "BuildingInstallation [id=" + getGmlId() + "]";
+    }
+
+    void anonymize() {
+        setGmlId(GmlId.generateId());
+        gmlBi = new org.citygml4j.core.model.building.BuildingInstallation();
+        gmlBi.setId(getGmlId().getGmlString());
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.anonymize();
+            gmlBi.getBoundaries().add(new AbstractSpaceBoundaryProperty(bs.getGmlObject()));
+        }
+    }
+
+
+    @Override
+    public AbstractInstallation getGmlObject() {
+        return gmlBi;
+    }
+
+    @Override
+    public FeatureType getFeatureType() {
+        return FeatureType.INSTALLATION;
+    }
+
+    public List<BoundarySurface> getBoundarySurfaces() {
+        if (boundarySurfaces == null) {
+            boundarySurfaces = new ArrayList<>(4);
+        }
+        return boundarySurfaces;
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        super.clearMetaInformation();
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.clearMetaInformation();
+        }
+    }
+
+    @Override
+    public void prepareForChecking() {
+        super.prepareForChecking();
+        for (BoundarySurface bs : boundarySurfaces) {
+            bs.prepareForChecking();
+        }
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        Installation originalBi = (Installation) original;
+        for (BoundarySurface originalBs : originalBi.boundarySurfaces) {
+            boundarySurfaces.add(handler.getCopyInstance(originalBs));
+        }
+        gmlBi = originalBi.gmlBi;
+        parent = handler.getCopyInstance(parent);
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        super.collectInstances(handler);
+        for (BoundarySurface bs : boundarySurfaces) {
+            handler.addInstance(bs);
+        }
+        handler.addInstance(parent);
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new Installation();
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/LandObject.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,107 +18,105 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
+import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
+import de.hft.stuttgart.citydoctor2.utils.Copyable;
 import org.citygml4j.core.model.core.AbstractCityObject;
 import org.citygml4j.core.model.landuse.LandUse;
 import org.citygml4j.core.util.geometry.GeometryFactory;
 import org.xmlobjects.gml.model.geometry.aggregates.MultiSurface;
 import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
 
-import de.hft.stuttgart.citydoctor2.check.Check;
-import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
-import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
-import de.hft.stuttgart.citydoctor2.utils.Copyable;
-
 import java.io.Serial;
 
 /**
  * Represents a land use CityGML object.
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class LandObject extends CityObject {
 
-	@Serial
-	private static final long serialVersionUID = 1887455662411087326L;
-
-	private LandUse lu;
-
-	public LandObject(LandUse lu) {
-		this.lu = lu;
-	}
-
-	@Override
-	public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
-		for (Geometry geom : getGeometries()) {
-			if (geom.getType() == GeometryType.MULTI_SURFACE) {
-				MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
-				setMultiSurfaceAccordingToLod(geom, ms);
-			} else {
-				throw new IllegalStateException("Landuse cannot have solids: " + geom);
-			}
-		}
-	}
-
-	@Override
-	public FeatureType getFeatureType() {
-		return FeatureType.LAND;
-	}
-
-	private void setMultiSurfaceAccordingToLod(Geometry geom, MultiSurface ms) {
-		switch (geom.getLod()) {
-		case LOD0:
-			lu.setLod0MultiSurface(new MultiSurfaceProperty(ms));
-			break;
-		case LOD1:
-			lu.setLod1MultiSurface(new MultiSurfaceProperty(ms));
-			break;
-		case LOD2:
-			lu.setLod2MultiSurface(new MultiSurfaceProperty(ms));
-			break;
-		case LOD3:
-			lu.setLod3MultiSurface(new MultiSurfaceProperty(ms));
-			break;
-		case LOD4:
-			lu.getDeprecatedProperties().setLod4MultiSurface(new MultiSurfaceProperty(ms));
-			break;
-		}
-	}
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-	}
-
-	@Override
-	public AbstractCityObject getGmlObject() {
-		return lu;
-	}
-
-	@Override
-	public void unsetGmlGeometries() {
-		lu.setLod0MultiSurface(null);
-		lu.setLod1MultiSurface(null);
-		lu.setLod2MultiSurface(null);
-		lu.setLod3MultiSurface(null);
-		lu.getDeprecatedProperties().setLod4MultiSurface(null);
-	}
-
-	public void setGmlObject(LandUse landUse) {
-		lu = landUse;
-	}
-
-	@Override
-	public String toString() {
-		return "LandObject [id=" + getGmlId() + "]";
-	}
-	
-	@Override
-	public Copyable createCopyInstance() {
-		return new LandObject(lu);
-	}
+    @Serial
+    private static final long serialVersionUID = 1887455662411087326L;
+
+    private LandUse lu;
+
+    public LandObject(LandUse lu) {
+        this.lu = lu;
+    }
+
+    @Override
+    public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
+        for (Geometry geom : getGeometries()) {
+            if (geom.getType() == GeometryType.MULTI_SURFACE) {
+                MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
+                setMultiSurfaceAccordingToLod(geom, ms);
+            } else {
+                throw new IllegalStateException("Landuse cannot have solids: " + geom);
+            }
+        }
+    }
+
+    @Override
+    public FeatureType getFeatureType() {
+        return FeatureType.LAND;
+    }
+
+    private void setMultiSurfaceAccordingToLod(Geometry geom, MultiSurface ms) {
+        switch (geom.getLod()) {
+            case LOD0:
+                lu.setLod0MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD1:
+                lu.setLod1MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD2:
+                lu.setLod2MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD3:
+                lu.setLod3MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+            case LOD4:
+                lu.getDeprecatedProperties().setLod4MultiSurface(new MultiSurfaceProperty(ms));
+                break;
+        }
+    }
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+    }
+
+    @Override
+    public AbstractCityObject getGmlObject() {
+        return lu;
+    }
+
+    @Override
+    public void unsetGmlGeometries() {
+        lu.setLod0MultiSurface(null);
+        lu.setLod1MultiSurface(null);
+        lu.setLod2MultiSurface(null);
+        lu.setLod3MultiSurface(null);
+        lu.getDeprecatedProperties().setLod4MultiSurface(null);
+    }
+
+    public void setGmlObject(LandUse landUse) {
+        lu = landUse;
+    }
+
+    @Override
+    public String toString() {
+        return "LandObject [id=" + getGmlId() + "]";
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new LandObject(lu);
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/LibraryObject.java

+package de.hft.stuttgart.citydoctor2.datastructure;
+
+import de.hft.stuttgart.citydoctor2.parser.CityGmlParseException;
+import de.hft.stuttgart.citydoctor2.parser.CityGmlParser;
+import de.hft.stuttgart.citydoctor2.parser.InvalidGmlFileException;
+import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.Serial;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Reference object for handling of implicit geometries with a library object contained in an external file
+ *
+ * @author Riegel
+ */
+public class LibraryObject extends Geometry {
+
+    private static final Logger logger = LogManager.getLogger(LibraryObject.class);
+    @Serial
+    private static final long serialVersionUID = -50293435187454911L;
+    private final String filepath;
+    private final ParserConfiguration config;
+    private static Map<String, LibraryObject> libraryObjects = new ConcurrentHashMap<>();
+
+    public static LibraryObject of(Path path, ParserConfiguration config) {
+        if (libraryObjects.containsKey(path.toString())) {
+            return libraryObjects.get(path.toString());
+        }
+        Geometry protoGeom = parseFile(path, config);
+        if (protoGeom == null) {
+            return null;
+        }
+        LibraryObject libOb = new LibraryObject(protoGeom.getType(), protoGeom.getLod(), path, config);
+        protoGeom.getPolygons().forEach(libOb::addPolygon);
+        libOb.updateEdgesAndVertices();
+        libraryObjects.put(path.toString(), libOb);
+        return libOb;
+    }
+
+    private LibraryObject(GeometryType type, Lod lod, Path path, ParserConfiguration config) {
+        super(type, lod);
+        this.filepath = path.toString();
+        this.config = config;
+    }
+
+
+    private static Geometry parseFile(Path path, ParserConfiguration config) {
+        Geometry geo = null;
+        if (path.toFile().exists()) {
+            try {
+                CityGmlParser.gagLogger(true);
+                CityDoctorModel model = CityGmlParser.parseCityGmlFile(path.toString(), config);
+                List<CityObject> objects = model.createFeatureStream().toList();
+                if (objects.isEmpty()) {
+                    throw new InvalidGmlFileException("Referenced library-object's gml file does not contain a CityGML object!");
+                } else if (objects.size() > 1) {
+                    throw new InvalidGmlFileException("Referenced library-object's gml file contains more than one CityGML object!");
+                }
+                geo = objects.get(0).getHighestLodGeometry();
+            } catch (CityGmlParseException e) {
+                logger.error(String.format(
+                        "Encountered an error while parsing library object %s", path));
+                logger.error(e.getStackTrace());
+            } catch (InvalidGmlFileException e) {
+                logger.error(e.getStackTrace());
+            } finally {
+                // Failsafe to remove gag should parsing fail
+                CityGmlParser.gagLogger(false);
+            }
+        } else {
+            logger.error(String.format("Implicit geometry references non-existing library object file %s.", path));
+        }
+        return geo;
+    }
+
+}

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/LinearRing.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,337 +18,332 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.ArrayList;
-import java.util.List;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
-import de.hft.stuttgart.citydoctor2.math.ProjectionAxis;
-import de.hft.stuttgart.citydoctor2.math.Ring2d;
-import de.hft.stuttgart.citydoctor2.math.UnitVector3d;
-import de.hft.stuttgart.citydoctor2.math.Vector2d;
-import de.hft.stuttgart.citydoctor2.math.Vector3d;
+import de.hft.stuttgart.citydoctor2.math.*;
 import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
 
+import java.io.Serial;
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Represents a linear ring used in polygons. The ring contains the vertices.
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class LinearRing extends GmlElement {
 
-	@Serial
-	private static final long serialVersionUID = -2488180830514940722L;
-
-	private LinearRingType type;
-	private Polygon parent;
-
-	private final List<Vertex> vertices = new ArrayList<>();
-
-	public enum LinearRingType {
-		EXTERIOR, INTERIOR
-	}
-
-	public LinearRing(LinearRingType type) {
-		this.type = type;
-	}
-
-	/**
-	 * Checks whether a point is inside this ring. A point on the edge does count as
-	 * inside.
-	 * 
-	 * @param v the point.
-	 * @return true if the point is inside or on an edge, false if it is outside.
-	 */
-	public boolean isPointInside(Vector3d v) {
-		// project to 2d ring
-		ProjectionAxis axis = ProjectionAxis.of(this);
-		Vector2d point = axis.project(v);
-		Ring2d ring = Ring2d.of(this, axis);
-
-		int t = -1;
-		for (int i = 0; i < ring.getVertices().size() - 1; i++) {
-			t = t * crossProdTest(point, ring.getVertices().get(i), ring.getVertices().get(i + 1));
-			if (t == 0) {
-				return true;
-			}
-		}
-		return t >= 0;
-	}
-
-	private int crossProdTest(Vector2d a, Vector2d b, Vector2d c) {
-		if (a.getY() == b.getY() && a.getY() == c.getY()) {
-			if ((b.getX() <= a.getX() && a.getX() <= c.getX()) || (c.getX() <= a.getX() && a.getX() <= b.getX())) {
-				return 0;
-			} else {
-				return 1;
-			}
-		}
-		if (a.getY() == b.getY() && a.getX() == b.getX()) {
-			return 0;
-		}
-		if (b.getY() > c.getY()) {
-			Vector2d temp = b;
-			b = c;
-			c = temp;
-		}
-		if (a.getY() <= b.getY() || a.getY() > c.getY()) {
-			return 1;
-		}
-		return calculateDelta(a, b, c);
-	}
-
-	private int calculateDelta(Vector2d a, Vector2d b, Vector2d c) {
-		double delta = (b.getX() - a.getX()) * (c.getY() - a.getY()) - (b.getY() - a.getY()) * (c.getX() - a.getX());
-		if (delta > 0) {
-			return -1;
-		} else if (delta < 0) {
-			return 1;
-		} else {
-			return 0;
-		}
-	}
-
-	/**
-	 * Calculates the normal vector of the ring. Method by Newell. If the Newell
-	 * method would return a (0, 0, 0) vector a cross product is formed from the
-	 * first 3 vertices. If there are no 3 vertices available (1, 0, 0) is returned.
-	 * 
-	 * @return the normal as a normalized vector
-	 */
-	public UnitVector3d calculateNormalNormalized() {
-		return calculateNormal().normalize();
-	}
-
-	/**
-	 * Calculates the normal vector of the ring. Method by Newell. If the Newell
-	 * method would return a (0, 0, 0) vector a cross product is formed from the
-	 * first 3 vertices. If there are no 3 vertices available (1, 0, 0) is returned.
-	 * 
-	 * @return the normal vector
-	 */
-	public Vector3d calculateNormal() {
-		double[] coords = new double[3];
-		for (int i = 0; i < vertices.size() - 1; i++) {
-			Vertex current = vertices.get(i);
-			Vertex next = vertices.get(i + 1);
-			coords[0] += (current.getZ() + next.getZ()) * (current.getY() - next.getY());
-			coords[1] += (current.getX() + next.getX()) * (current.getZ() - next.getZ());
-			coords[2] += (current.getY() + next.getY()) * (current.getX() - next.getX());
-		}
-
-		if (coords[0] == 0 && coords[1] == 0 && coords[2] == 0) {
-			// no valid normal vector found
-			if (vertices.size() < 3) {
-				// no three points, return x-axis
-				return UnitVector3d.X_AXIS;
-			}
-
-			Vertex v1 = vertices.get(0);
-			Vertex v2 = vertices.get(1);
-			Vertex v3 = vertices.get(2);
-			return calculateNormalWithCross(v1, v2, v3);
-		}
-		return new Vector3d(coords);
-	}
-
-	public double getArea() {
-		int n = vertices.size();
-		if (n < 3)
-			return 0.0; // a degenerated polygon
-
-		// prepare an vertex array with n+2 vertices:
-		// V[0] ... V[n-1] - the n different vertices
-		// V[n]=V[0]
-		// V[n+1]=V[1]
-		Vertex[] vertexArray = new Vertex[n + 2];
-		for (int i = 0; i < n; i++) {
-			vertexArray[i] = vertices.get(i);
-		}
-		vertexArray[n] = vertices.get(0);
-		vertexArray[n + 1] = vertices.get(1);
-		double area = 0;
-
-		// make sure the normal has been calculated
-		Vector3d normal = calculateNormal();
-		// select largest abs coordinate to ignore for projection
-		double ax = Math.abs(normal.getX()); // abs x-coord
-		double ay = Math.abs(normal.getY()); // abs y-coord
-		double az = Math.abs(normal.getZ()); // abs z-coord
-
-		// coord to ignore: 1=x, 2=y, 3=z
-		int coord = 3; // ignore z-coord
-		if (ax > ay) {
-			if (ax > az) {
-				coord = 1; // ignore x-coord
-			}
-		} else if (ay > az) {
-			coord = 2; // ignore y-coord
-		}
-
-		// compute area of the 2D projection
-		for (int i = 1, j = 2, k = 0; i <= vertexArray.length - 2; i++, j++, k++) {
-			switch (coord) {
-			case 1:
-				area += (vertexArray[i].getY() * (vertexArray[j].getZ() - vertexArray[k].getZ()));
-				break;
-			case 2:
-				area += (vertexArray[i].getX() * (vertexArray[j].getZ() - vertexArray[k].getZ()));
-				break;
-			case 3:
-				area += (vertexArray[i].getX() * (vertexArray[j].getY() - vertexArray[k].getY()));
-				break;
-			default:
-				throw new IllegalStateException();
-			}
-		}
-
-		// scale to get area before projection
-		double an = Math.sqrt(ax * ax + ay * ay + az * az); // length of normal vector
-
-		switch (coord) {
-		case 1:
-			area *= (an / (2 * ax));
-			break;
-		case 2:
-			area *= (an / (2 * ay));
-			break;
-		case 3:
-			area *= (an / (2 * az));
-			break;
-		default:
-			throw new IllegalStateException();
-		}
-
-		return Math.abs(area);
-	}
-
-	private UnitVector3d calculateNormalWithCross(Vertex v1, Vertex v2, Vertex v3) {
-		Vector3d dir1 = v2.minus(v1);
-		Vector3d dir2 = v3.minus(v1);
-		Vector3d cross = dir1.cross(dir2);
-		return cross.normalize();
-	}
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-	}
-
-	@Override
-	public void clearAllContainedCheckResults() {
-		super.clearCheckResults();
-	}
-
-	public void setParent(Polygon polygon) {
-		parent = polygon;
-	}
-
-	public Polygon getParent() {
-		return parent;
-	}
-
-	public LinearRingType getType() {
-		return type;
-	}
-
-	public List<Vertex> getVertices() {
-		return vertices;
-	}
-
-	public void addVertex(Vertex v) {
-		vertices.add(v);
-		if (parent == null) {
-			return;
-		}
-		if (parent.isLinkedTo()) {
-			v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
-		}
-		v.addAdjacentRing(this, parent.getParent());
-	}
-
-	public void addVertex(int i, Vertex v) {
-		vertices.add(i, v);
-		if (parent.isLinkedTo()) {
-			v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
-		}
-		v.addAdjacentRing(this, parent.getParent());
-	}
-
-	public void setVertex(int i, Vertex v) {
-		vertices.set(i, v);
-		if (parent.isLinkedTo()) {
-			v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
-		}
-		v.addAdjacentRing(this, parent.getParent());
-	}
-
-	@Override
-	public String toString() {
-		return "LinearRing [type=" + type + ", gmlId=" + getGmlId() + "]";
-	}
-
-	void anonymize() {
-		setGmlId(GmlId.generateId());
-	}
-
-	public boolean isRingConnectedViaPoint(LinearRing other) {
-		for (Vertex v : vertices) {
-			if (other.getVertices().contains(v)) {
-				return true;
-			}
-		}
-		return false;
-	}
-
-	public boolean hasPointAsCorner(Vertex v) {
-		return vertices.contains(v);
-	}
-
-	public void setType(LinearRingType type) {
-		this.type = type;
-	}
-
-	public void addAllVertices(List<Vertex> extRing) {
-		vertices.addAll(extRing);
-	}
-
-	@Override
-	public void prepareForChecking() {
-		parent.getParent().prepareForChecking();
-	}
-
-	@Override
-	public void clearMetaInformation() {
-		parent.getParent().clearMetaInformation();
-	}
-
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		super.fillValues(original, handler);
-		LinearRing originalRing = (LinearRing) original;
-		type = originalRing.type;
-		parent = handler.getCopyInstance(originalRing.parent);
-		for (Vertex v : originalRing.vertices) {
-			vertices.add(handler.getCopyInstance(v));
-		}
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		for (Vertex v : vertices) {
-			handler.addInstance(v);
-		}
-		handler.addInstance(parent);
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new LinearRing(type);
-	}
+    @Serial
+    private static final long serialVersionUID = -2488180830514940722L;
+
+    private LinearRingType type;
+    private Polygon parent;
+
+    private final List<Vertex> vertices = new ArrayList<>();
+
+    public enum LinearRingType {
+        EXTERIOR, INTERIOR
+    }
+
+    public LinearRing(LinearRingType type) {
+        this.type = type;
+    }
+
+    /**
+     * Checks whether a point is inside this ring. A point on the edge does count as
+     * inside.
+     *
+     * @param v the point.
+     * @return true if the point is inside or on an edge, false if it is outside.
+     */
+    public boolean isPointInside(Vector3d v) {
+        // project to 2d ring
+        ProjectionAxis axis = ProjectionAxis.of(this);
+        Vector2d point = axis.project(v);
+        Ring2d ring = Ring2d.of(this, axis);
+
+        int t = -1;
+        for (int i = 0; i < ring.getVertices().size() - 1; i++) {
+            t = t * crossProdTest(point, ring.getVertices().get(i), ring.getVertices().get(i + 1));
+            if (t == 0) {
+                return true;
+            }
+        }
+        return t >= 0;
+    }
+
+    private int crossProdTest(Vector2d a, Vector2d b, Vector2d c) {
+        if (a.getY() == b.getY() && a.getY() == c.getY()) {
+            if ((b.getX() <= a.getX() && a.getX() <= c.getX()) || (c.getX() <= a.getX() && a.getX() <= b.getX())) {
+                return 0;
+            } else {
+                return 1;
+            }
+        }
+        if (a.getY() == b.getY() && a.getX() == b.getX()) {
+            return 0;
+        }
+        if (b.getY() > c.getY()) {
+            Vector2d temp = b;
+            b = c;
+            c = temp;
+        }
+        if (a.getY() <= b.getY() || a.getY() > c.getY()) {
+            return 1;
+        }
+        return calculateDelta(a, b, c);
+    }
+
+    private int calculateDelta(Vector2d a, Vector2d b, Vector2d c) {
+        double delta = (b.getX() - a.getX()) * (c.getY() - a.getY()) - (b.getY() - a.getY()) * (c.getX() - a.getX());
+        if (delta > 0) {
+            return -1;
+        } else if (delta < 0) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * Calculates the normal vector of the ring. Method by Newell. If the Newell
+     * method would return a (0, 0, 0) vector a cross product is formed from the
+     * first 3 vertices. If there are no 3 vertices available (1, 0, 0) is returned.
+     *
+     * @return the normal as a normalized vector
+     */
+    public UnitVector3d calculateNormalNormalized() {
+        return calculateNormal().normalize();
+    }
+
+    /**
+     * Calculates the normal vector of the ring. Method by Newell. If the Newell
+     * method would return a (0, 0, 0) vector a cross product is formed from the
+     * first 3 vertices. If there are no 3 vertices available (1, 0, 0) is returned.
+     *
+     * @return the normal vector
+     */
+    public Vector3d calculateNormal() {
+        double[] coords = new double[3];
+        for (int i = 0; i < vertices.size() - 1; i++) {
+            Vertex current = vertices.get(i);
+            Vertex next = vertices.get(i + 1);
+            coords[0] += (current.getZ() + next.getZ()) * (current.getY() - next.getY());
+            coords[1] += (current.getX() + next.getX()) * (current.getZ() - next.getZ());
+            coords[2] += (current.getY() + next.getY()) * (current.getX() - next.getX());
+        }
+
+        if (coords[0] == 0 && coords[1] == 0 && coords[2] == 0) {
+            // no valid normal vector found
+            if (vertices.size() < 3) {
+                // no three points, return x-axis
+                return UnitVector3d.X_AXIS;
+            }
+
+            Vertex v1 = vertices.get(0);
+            Vertex v2 = vertices.get(1);
+            Vertex v3 = vertices.get(2);
+            return calculateNormalWithCross(v1, v2, v3);
+        }
+        return new Vector3d(coords);
+    }
+
+    public double getArea() {
+        int n = vertices.size();
+        if (n < 3)
+            return 0.0; // a degenerated polygon
+
+        // prepare an vertex array with n+2 vertices:
+        // V[0] ... V[n-1] - the n different vertices
+        // V[n]=V[0]
+        // V[n+1]=V[1]
+        Vertex[] vertexArray = new Vertex[n + 2];
+        for (int i = 0; i < n; i++) {
+            vertexArray[i] = vertices.get(i);
+        }
+        vertexArray[n] = vertices.get(0);
+        vertexArray[n + 1] = vertices.get(1);
+        double area = 0;
+
+        // make sure the normal has been calculated
+        Vector3d normal = calculateNormal();
+        // select largest abs coordinate to ignore for projection
+        double ax = Math.abs(normal.getX()); // abs x-coord
+        double ay = Math.abs(normal.getY()); // abs y-coord
+        double az = Math.abs(normal.getZ()); // abs z-coord
+
+        // coord to ignore: 1=x, 2=y, 3=z
+        int coord = 3; // ignore z-coord
+        if (ax > ay) {
+            if (ax > az) {
+                coord = 1; // ignore x-coord
+            }
+        } else if (ay > az) {
+            coord = 2; // ignore y-coord
+        }
+
+        // compute area of the 2D projection
+        for (int i = 1, j = 2, k = 0; i <= vertexArray.length - 2; i++, j++, k++) {
+            switch (coord) {
+                case 1:
+                    area += (vertexArray[i].getY() * (vertexArray[j].getZ() - vertexArray[k].getZ()));
+                    break;
+                case 2:
+                    area += (vertexArray[i].getX() * (vertexArray[j].getZ() - vertexArray[k].getZ()));
+                    break;
+                case 3:
+                    area += (vertexArray[i].getX() * (vertexArray[j].getY() - vertexArray[k].getY()));
+                    break;
+                default:
+                    throw new IllegalStateException();
+            }
+        }
+
+        // scale to get area before projection
+        double an = Math.sqrt(ax * ax + ay * ay + az * az); // length of normal vector
+
+        switch (coord) {
+            case 1:
+                area *= (an / (2 * ax));
+                break;
+            case 2:
+                area *= (an / (2 * ay));
+                break;
+            case 3:
+                area *= (an / (2 * az));
+                break;
+            default:
+                throw new IllegalStateException();
+        }
+
+        return Math.abs(area);
+    }
+
+    private UnitVector3d calculateNormalWithCross(Vertex v1, Vertex v2, Vertex v3) {
+        Vector3d dir1 = v2.minus(v1);
+        Vector3d dir2 = v3.minus(v1);
+        Vector3d cross = dir1.cross(dir2);
+        return cross.normalize();
+    }
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearCheckResults();
+    }
+
+    public void setParent(Polygon polygon) {
+        parent = polygon;
+    }
+
+    public Polygon getParent() {
+        return parent;
+    }
+
+    public LinearRingType getType() {
+        return type;
+    }
+
+    public List<Vertex> getVertices() {
+        return vertices;
+    }
+
+    public void addVertex(Vertex v) {
+        vertices.add(v);
+        if (parent == null) {
+            return;
+        }
+        if (parent.isLinkedTo()) {
+            v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
+        }
+        v.addAdjacentRing(this, parent.getParent());
+    }
+
+    public void addVertex(int i, Vertex v) {
+        vertices.add(i, v);
+        if (parent.isLinkedTo()) {
+            v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
+        }
+        v.addAdjacentRing(this, parent.getParent());
+    }
+
+    public void setVertex(int i, Vertex v) {
+        vertices.set(i, v);
+        if (parent.isLinkedTo()) {
+            v.addAdjacentRing(this, parent.getLinkedFromPolygon().getParent());
+        }
+        v.addAdjacentRing(this, parent.getParent());
+    }
+
+    @Override
+    public String toString() {
+        return "LinearRing [type=" + type + ", gmlId=" + getGmlId() + "]";
+    }
+
+    void anonymize() {
+        setGmlId(GmlId.generateId());
+    }
+
+    public boolean isRingConnectedViaPoint(LinearRing other) {
+        for (Vertex v : vertices) {
+            if (other.getVertices().contains(v)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public boolean hasPointAsCorner(Vertex v) {
+        return vertices.contains(v);
+    }
+
+    public void setType(LinearRingType type) {
+        this.type = type;
+    }
+
+    public void addAllVertices(List<Vertex> extRing) {
+        vertices.addAll(extRing);
+    }
+
+    @Override
+    public void prepareForChecking() {
+        parent.getParent().prepareForChecking();
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        parent.getParent().clearMetaInformation();
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        LinearRing originalRing = (LinearRing) original;
+        type = originalRing.type;
+        parent = handler.getCopyInstance(originalRing.parent);
+        for (Vertex v : originalRing.vertices) {
+            vertices.add(handler.getCopyInstance(v));
+        }
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        for (Vertex v : vertices) {
+            handler.addInstance(v);
+        }
+        handler.addInstance(parent);
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new LinearRing(type);
+    }
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/LinkedPolygon.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,10 +18,6 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import java.io.Serial;
-import java.util.List;
-import java.util.Map;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
 import de.hft.stuttgart.citydoctor2.check.CheckError;
 import de.hft.stuttgart.citydoctor2.check.CheckId;
@@ -31,275 +27,277 @@ import de.hft.stuttgart.citydoctor2.tesselation.TesselatedPolygon;
 import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
 
+import java.io.Serial;
+import java.util.List;
+import java.util.Map;
+
 /**
  * A polygon that does not contain the geometry but is only a link to an actual
  * polygon. Created when href in CityGML are used.
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class LinkedPolygon extends Polygon {
 
-	@Serial
-	private static final long serialVersionUID = -4897578390280277931L;
-
-	private Geometry parent;
-	private ConcretePolygon poly;
-	
-	private LinkedPolygon() {
-	}
-	
-	/**
-	 * 
-	 * @param poly   polygon this is linked to
-	 * @param parent the parent of the linked polygon
-	 */
-	public LinkedPolygon(ConcretePolygon poly, Geometry parent) {
-		this.parent = parent;
-		this.poly = poly;
-		poly.setLinkedTo(this);
-		for (Vertex v : poly.getExteriorRing().getVertices()) {
-			v.addAdjacentRing(poly.getExteriorRing(), parent);
-		}
-		for (LinearRing lr : poly.getInnerRings()) {
-			for (Vertex v : lr.getVertices()) {
-				v.addAdjacentRing(lr, parent);
-			}
-		}
-	}
-
-	@Override
-	public CheckResult getCheckResult(Check c) {
-		return poly.getCheckResult(c);
-	}
-
-	@Override
-	public Map<CheckId, CheckResult> getAllCheckResults() {
-		return poly.getAllCheckResults();
-	}
-
-	@Override
-	public boolean hasAnyError() {
-		return poly.hasAnyError();
-	}
-
-	@Override
-	public boolean hasDependencyNotMetError(CheckId id) {
-		return poly.hasDependencyNotMetError(id);
-	}
-
-	@Override
-	public CheckResult getCheckResult(CheckId id) {
-		return poly.getCheckResult(id);
-	}
-
-	@Override
-	public boolean hasCheckResults() {
-		return poly.hasCheckResults();
-	}
-
-	@Override
-	public void setGmlId(GmlId id) {
-		poly.setGmlId(id);
-	}
-
-	@Override
-	public GmlId getGmlId() {
-		return poly.getGmlId();
-	}
-
-	@Override
-	public void accept(Check c) {
-		// linked polygons are not checked
-		setValidated(true);
-	}
-
-	@Override
-	public void addCheckResult(CheckResult cr) {
-		poly.addCheckResult(cr);
-	}
-
-	@Override
-	public void collectContainedErrors(List<CheckError> errors) {
-		poly.collectContainedErrors(errors);
-	}
-
-	@Override
-	public boolean containsAnyError() {
-		return poly.containsAnyError();
-	}
-
-	@Override
-	public boolean containsError(CheckId checkIdentifier) {
-		return poly.containsError(checkIdentifier);
-	}
-
-	@Override
-	public void clearCheckResults() {
-		poly.clearCheckResults();
-	}
-
-	@Override
-	public Vector3d calculateNormalNormalized() {
-		return poly.calculateNormalNormalized();
-	}
-	
-	@Override
-	public Vector3d calculateNormal() {
-		return poly.calculateNormal();
-	}
-
-	@Override
-	public TesselatedPolygon tesselate() {
-		return poly.tesselate();
-	}
-
-	@Override
-	public LinearRing getExteriorRing() {
-		return poly.getExteriorRing();
-	}
-
-	@Override
-	public List<LinearRing> getInnerRings() {
-		return poly.getInnerRings();
-	}
-
-	@Override
-	public boolean isPointInsideExteriorRing(Vector3d v) {
-		return poly.isPointInsideExteriorRing(v);
-	}
-
-	@Override
-	public Geometry getParent() {
-		return parent;
-	}
-
-	@Override
-	public void setParent(Geometry geometry) {
-		this.parent = geometry;
-	}
-
-	@Override
-	public void setExteriorRing(LinearRing extRing) {
-		poly.setExteriorRing(extRing);
-	}
-
-	@Override
-	public boolean isPolygonConnectedViaPoint(Polygon other) {
-		return poly.isPolygonConnectedViaPoint(other);
-	}
-
-	@Override
-	public String toString() {
-		return "LinkedPolygon [" + poly.getGmlId() + "]";
-	}
-
-	@Override
-	public void addInteriorRing(LinearRing inter) {
-		poly.addInteriorRing(inter);
-	}
-
-	@Override
-	public BoundarySurface getPartOfSurface() {
-		return poly.getPartOfSurface();
-	}
-
-	@Override
-	public void setPartOfSurface(BoundarySurface bs) {
-		poly.setPartOfSurface(bs);
-	}
-
-	@Override
-	public void removeInnerRing(LinearRing ring) {
-		poly.removeInnerRing(ring);
-	}
-
-	@Override
-	public void setPartOfInstallation(Installation bi) {
-		poly.setPartOfInstallation(bi);
-	}
-
-	@Override
-	public Installation getPartOfInstallation() {
-		return poly.getPartOfInstallation();
-	}
-
-	@Override
-	public boolean hasPointAsCorner(Vertex v) {
-		return poly.hasPointAsCorner(v);
-	}
-
-	@Override
-	public void removeRings() {
-		poly.removeRings();
-	}
-
-	@Override
-	public boolean isLink() {
-		return true;
-	}
-
-	@Override
-	public LinkedPolygon getLinkedFromPolygon() {
-		return this;
-	}
-
-	@Override
-	void anonymize() {
-		poly.anonymize();
-	}
-
-	@Override
-	public void clearAllContainedCheckResults() {
-		poly.clearAllContainedCheckResults();
-	}
-
-	@Override
-	public ConcretePolygon getOriginal() {
-		return poly;
-	}
-
-	@Override
-	public void prepareForChecking() {
-		poly.prepareForChecking();
-	}
-
-	@Override
-	public void clearMetaInformation() {
-		poly.clearMetaInformation();
-	}
-
-	@Override
-	public boolean isLinkedTo() {
-		return false;
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		handler.addInstance(parent);
-		handler.addInstance(poly);
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new LinkedPolygon();
-	}
-	
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		LinkedPolygon linkedOriginal = (LinkedPolygon) original;
-		parent = handler.getCopyInstance(linkedOriginal.parent);
-		poly = handler.getCopyInstance(linkedOriginal.poly);
-	}
-
-	@Override
-	public void remove() {
-		poly.remove();
-	}
-
-	@Override
-	public double getArea() {
-		return poly.getArea();
-	}
+    @Serial
+    private static final long serialVersionUID = -4897578390280277931L;
+
+    private Geometry parent;
+    private ConcretePolygon poly;
+
+    private LinkedPolygon() {
+    }
+
+    /**
+     * @param poly   polygon this is linked to
+     * @param parent the parent of the linked polygon
+     */
+    public LinkedPolygon(ConcretePolygon poly, Geometry parent) {
+        this.parent = parent;
+        this.poly = poly;
+        poly.setLinkedTo(this);
+        for (Vertex v : poly.getExteriorRing().getVertices()) {
+            v.addAdjacentRing(poly.getExteriorRing(), parent);
+        }
+        for (LinearRing lr : poly.getInnerRings()) {
+            for (Vertex v : lr.getVertices()) {
+                v.addAdjacentRing(lr, parent);
+            }
+        }
+    }
+
+    @Override
+    public CheckResult getCheckResult(Check c) {
+        return poly.getCheckResult(c);
+    }
+
+    @Override
+    public Map<CheckId, CheckResult> getAllCheckResults() {
+        return poly.getAllCheckResults();
+    }
+
+    @Override
+    public boolean hasAnyError() {
+        return poly.hasAnyError();
+    }
+
+    @Override
+    public boolean hasDependencyNotMetError(CheckId id) {
+        return poly.hasDependencyNotMetError(id);
+    }
+
+    @Override
+    public CheckResult getCheckResult(CheckId id) {
+        return poly.getCheckResult(id);
+    }
+
+    @Override
+    public boolean hasCheckResults() {
+        return poly.hasCheckResults();
+    }
+
+    @Override
+    public void setGmlId(GmlId id) {
+        poly.setGmlId(id);
+    }
+
+    @Override
+    public GmlId getGmlId() {
+        return poly.getGmlId();
+    }
+
+    @Override
+    public void accept(Check c) {
+        // linked polygons are not checked
+        setValidated(true);
+    }
+
+    @Override
+    public void addCheckResult(CheckResult cr) {
+        poly.addCheckResult(cr);
+    }
+
+    @Override
+    public void collectContainedErrors(List<CheckError> errors) {
+        poly.collectContainedErrors(errors);
+    }
+
+    @Override
+    public boolean containsAnyError() {
+        return poly.containsAnyError();
+    }
+
+    @Override
+    public boolean containsError(CheckId checkIdentifier) {
+        return poly.containsError(checkIdentifier);
+    }
+
+    @Override
+    public void clearCheckResults() {
+        poly.clearCheckResults();
+    }
+
+    @Override
+    public Vector3d calculateNormalNormalized() {
+        return poly.calculateNormalNormalized();
+    }
+
+    @Override
+    public Vector3d calculateNormal() {
+        return poly.calculateNormal();
+    }
+
+    @Override
+    public TesselatedPolygon tesselate() {
+        return poly.tesselate();
+    }
+
+    @Override
+    public LinearRing getExteriorRing() {
+        return poly.getExteriorRing();
+    }
+
+    @Override
+    public List<LinearRing> getInnerRings() {
+        return poly.getInnerRings();
+    }
+
+    @Override
+    public boolean isPointInsideExteriorRing(Vector3d v) {
+        return poly.isPointInsideExteriorRing(v);
+    }
+
+    @Override
+    public Geometry getParent() {
+        return parent;
+    }
+
+    @Override
+    public void setParent(Geometry geometry) {
+        this.parent = geometry;
+    }
+
+    @Override
+    public void setExteriorRing(LinearRing extRing) {
+        poly.setExteriorRing(extRing);
+    }
+
+    @Override
+    public boolean isPolygonConnectedViaPoint(Polygon other) {
+        return poly.isPolygonConnectedViaPoint(other);
+    }
+
+    @Override
+    public String toString() {
+        return "LinkedPolygon [" + poly.getGmlId() + "]";
+    }
+
+    @Override
+    public void addInteriorRing(LinearRing inter) {
+        poly.addInteriorRing(inter);
+    }
+
+    @Override
+    public BoundarySurface getPartOfSurface() {
+        return poly.getPartOfSurface();
+    }
+
+    @Override
+    public void setPartOfSurface(BoundarySurface bs) {
+        poly.setPartOfSurface(bs);
+    }
+
+    @Override
+    public void removeInnerRing(LinearRing ring) {
+        poly.removeInnerRing(ring);
+    }
+
+    @Override
+    public void setPartOfInstallation(Installation bi) {
+        poly.setPartOfInstallation(bi);
+    }
+
+    @Override
+    public Installation getPartOfInstallation() {
+        return poly.getPartOfInstallation();
+    }
+
+    @Override
+    public boolean hasPointAsCorner(Vertex v) {
+        return poly.hasPointAsCorner(v);
+    }
+
+    @Override
+    public void removeRings() {
+        poly.removeRings();
+    }
+
+    @Override
+    public boolean isLink() {
+        return true;
+    }
+
+    @Override
+    public LinkedPolygon getLinkedFromPolygon() {
+        return this;
+    }
+
+    @Override
+    void anonymize() {
+        poly.anonymize();
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        poly.clearAllContainedCheckResults();
+    }
+
+    @Override
+    public ConcretePolygon getOriginal() {
+        return poly;
+    }
+
+    @Override
+    public void prepareForChecking() {
+        poly.prepareForChecking();
+    }
+
+    @Override
+    public void clearMetaInformation() {
+        poly.clearMetaInformation();
+    }
+
+    @Override
+    public boolean isLinkedTo() {
+        return false;
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        handler.addInstance(parent);
+        handler.addInstance(poly);
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new LinkedPolygon();
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        LinkedPolygon linkedOriginal = (LinkedPolygon) original;
+        parent = handler.getCopyInstance(linkedOriginal.parent);
+        poly = handler.getCopyInstance(linkedOriginal.poly);
+    }
+
+    @Override
+    public void remove() {
+        poly.remove();
+    }
+
+    @Override
+    public double getArea() {
+        return poly.getArea();
+    }
 
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/Lod.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -20,24 +20,23 @@ package de.hft.stuttgart.citydoctor2.datastructure;
 
 /**
  * The different LODs available in CityGML
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public enum Lod {
 
-	LOD0(0), LOD1(1), LOD2(2), LOD3(3), LOD4(4);
+    LOD0(0), LOD1(1), LOD2(2), LOD3(3), LOD4(4);
 
-	private final int rank;
+    private final int rank;
 
-	private Lod(int rank) {
-		this.rank = rank;
-	}
+    private Lod(int rank) {
+        this.rank = rank;
+    }
 
-	public boolean isHigher(Lod other) {
-		if (other == null) {
-			return true;
-		}
-		return rank > other.rank;
-	}
+    public boolean isHigher(Lod other) {
+        if (other == null) {
+            return true;
+        }
+        return rank > other.rank;
+    }
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/Opening.java

 /*-
  *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
- * 
+ *
  *  This file is part of CityDoctor2.
  *
  *  CityDoctor2 is free software: you can redistribute it and/or modify
@@ -18,17 +18,16 @@
  */
 package de.hft.stuttgart.citydoctor2.datastructure;
 
-import org.citygml4j.core.model.construction.AbstractFillingSurface;
-import org.citygml4j.core.model.core.AbstractCityObject;
-import org.citygml4j.core.util.geometry.GeometryFactory;
-import org.xmlobjects.gml.model.geometry.aggregates.MultiSurface;
-import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
-
 import de.hft.stuttgart.citydoctor2.check.Check;
 import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
 import de.hft.stuttgart.citydoctor2.utils.CityGmlUtils;
 import de.hft.stuttgart.citydoctor2.utils.CopyHandler;
 import de.hft.stuttgart.citydoctor2.utils.Copyable;
+import org.citygml4j.core.model.construction.AbstractFillingSurface;
+import org.citygml4j.core.model.core.AbstractCityObject;
+import org.citygml4j.core.util.geometry.GeometryFactory;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurface;
+import org.xmlobjects.gml.model.geometry.aggregates.MultiSurfaceProperty;
 
 import java.io.Serial;
 
@@ -36,145 +35,144 @@ import java.io.Serial;
  * Represents an Opening suchs a window or Door in a surface of a feature.
  * Contains a reference to the boundary surface where this opening is embedded
  * in.
- * 
- * @author Matthias Betz
  *
+ * @author Matthias Betz
  */
 public class Opening extends CityObject {
 
-	@Serial
-	private static final long serialVersionUID = 6409303152284607944L;
-
-	private BoundarySurface partOf;
-	private OpeningType type;
-	private SurfaceFeatureType featureType;
-
-	private AbstractFillingSurface ao;
-
-	private Opening(OpeningType type) {
-		this.type = type;
-	}
-
-	public Opening(OpeningType type, SurfaceFeatureType featureType, BoundarySurface partOf,
-			AbstractFillingSurface ao) {
-		this.featureType = featureType;
-		this.partOf = partOf;
-		this.type = type;
-		this.ao = ao;
-	}
-
-	public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
-		if (ao.getId() != null) {
-			ao.setId(getGmlId().getGmlString());
-		}
-		for (Geometry geom : getGeometries()) {
-			if (geom.getType() == GeometryType.MULTI_SURFACE) {
-				MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
-				setGeometryAccordingToLod(geom.getLod(), new MultiSurfaceProperty(ms));
-			} else {
-				throw new IllegalStateException("Openings can only have MultiSurface geometries");
-			}
-		}
-	}
-
-	private void setGeometryAccordingToLod(Lod lod, MultiSurfaceProperty ms) {
-		switch (lod) {
-		case LOD0:
-			ao.setLod0MultiSurface(ms);
-			break;
-		case LOD1:
-			ao.setLod1MultiSurface(ms);
-			break;
-		case LOD2:
-			ao.setLod2MultiSurface(ms);
-			break;
-		case LOD3:
-			ao.setLod3MultiSurface(ms);
-			break;
-		case LOD4:
-			ao.getDeprecatedProperties().setLod4MultiSurface(ms);
-			break;
-		default:
-			throw new IllegalStateException("Cannot add geometry to opening because lod is not allowed: " + lod);
-		}
-	}
-
-
-	public SurfaceFeatureType getSurfaceFeatureType() {
-		return featureType;
-	}
-
-	public BoundarySurface getPartOf() {
-		return partOf;
-	}
-
-	public void setType(OpeningType type) {
-		this.type = type;
-	}
-
-	public OpeningType getType() {
-		return type;
-	}
-
-	@Override
-	public void accept(Check c) {
-		super.accept(c);
-		if (c.canExecute(this)) {
-			c.check(this);
-		}
-	}
-
-	@Override
-	public void clearAllContainedCheckResults() {
-		super.clearCheckResults();
-	}
-
-	public void unsetGmlGeometries() {
-		ao.setLod0MultiSurface(null);
-		ao.setLod1MultiSurface(null);
-		ao.setLod2MultiSurface(null);
-		ao.setLod3MultiSurface(null);
-		ao.getDeprecatedProperties().setLod4MultiSurface(null);
-	}
-
-	@Override
-	public String toString() {
-		return "Opening [type=" + type + ", id=" + getGmlId() + "]";
-	}
-
-	public void setPartOfSurface(BoundarySurface boundarySurface) {
-		partOf = boundarySurface;
-	}
-
-	@Override
-	public AbstractCityObject getGmlObject() {
-		return ao;
-	}
-
-	@Override
-	public FeatureType getFeatureType() {
-		return FeatureType.OPENING;
-	}
-
-	@Override
-	public Copyable createCopyInstance() {
-		return new Opening(type);
-	}
-
-	@Override
-	public void collectInstances(CopyHandler handler) {
-		super.collectInstances(handler);
-		handler.addInstance(partOf);
-	}
-
-	@Override
-	public void fillValues(Copyable original, CopyHandler handler) {
-		super.fillValues(original, handler);
-		Opening originalOpening = (Opening) original;
-		partOf = handler.getCopyInstance(originalOpening.partOf);
-		type = originalOpening.type;
-		featureType = originalOpening.featureType;
-		ao = originalOpening.ao;
-	}
+    @Serial
+    private static final long serialVersionUID = 6409303152284607944L;
+
+    private BoundarySurface partOf;
+    private OpeningType type;
+    private SurfaceFeatureType featureType;
+
+    private AbstractFillingSurface ao;
+
+    private Opening(OpeningType type) {
+        this.type = type;
+    }
+
+    public Opening(OpeningType type, SurfaceFeatureType featureType, BoundarySurface partOf,
+                   AbstractFillingSurface ao) {
+        this.featureType = featureType;
+        this.partOf = partOf;
+        this.type = type;
+        this.ao = ao;
+    }
+
+    public void reCreateGeometries(GeometryFactory factory, ParserConfiguration config) {
+        if (ao.getId() != null) {
+            ao.setId(getGmlId().getGmlString());
+        }
+        for (Geometry geom : getGeometries()) {
+            if (geom.getType() == GeometryType.MULTI_SURFACE) {
+                MultiSurface ms = CityGmlUtils.createMultiSurface(geom, factory, config);
+                setGeometryAccordingToLod(geom.getLod(), new MultiSurfaceProperty(ms));
+            } else {
+                throw new IllegalStateException("Openings can only have MultiSurface geometries");
+            }
+        }
+    }
+
+    private void setGeometryAccordingToLod(Lod lod, MultiSurfaceProperty ms) {
+        switch (lod) {
+            case LOD0:
+                ao.setLod0MultiSurface(ms);
+                break;
+            case LOD1:
+                ao.setLod1MultiSurface(ms);
+                break;
+            case LOD2:
+                ao.setLod2MultiSurface(ms);
+                break;
+            case LOD3:
+                ao.setLod3MultiSurface(ms);
+                break;
+            case LOD4:
+                ao.getDeprecatedProperties().setLod4MultiSurface(ms);
+                break;
+            default:
+                throw new IllegalStateException("Cannot add geometry to opening because lod is not allowed: " + lod);
+        }
+    }
+
+
+    public SurfaceFeatureType getSurfaceFeatureType() {
+        return featureType;
+    }
+
+    public BoundarySurface getPartOf() {
+        return partOf;
+    }
+
+    public void setType(OpeningType type) {
+        this.type = type;
+    }
+
+    public OpeningType getType() {
+        return type;
+    }
+
+    @Override
+    public void accept(Check c) {
+        super.accept(c);
+        if (c.canExecute(this)) {
+            c.check(this);
+        }
+    }
+
+    @Override
+    public void clearAllContainedCheckResults() {
+        super.clearCheckResults();
+    }
+
+    public void unsetGmlGeometries() {
+        ao.setLod0MultiSurface(null);
+        ao.setLod1MultiSurface(null);
+        ao.setLod2MultiSurface(null);
+        ao.setLod3MultiSurface(null);
+        ao.getDeprecatedProperties().setLod4MultiSurface(null);
+    }
+
+    @Override
+    public String toString() {
+        return "Opening [type=" + type + ", id=" + getGmlId() + "]";
+    }
+
+    public void setPartOfSurface(BoundarySurface boundarySurface) {
+        partOf = boundarySurface;
+    }
+
+    @Override
+    public AbstractCityObject getGmlObject() {
+        return ao;
+    }
+
+    @Override
+    public FeatureType getFeatureType() {
+        return FeatureType.OPENING;
+    }
+
+    @Override
+    public Copyable createCopyInstance() {
+        return new Opening(type);
+    }
+
+    @Override
+    public void collectInstances(CopyHandler handler) {
+        super.collectInstances(handler);
+        handler.addInstance(partOf);
+    }
+
+    @Override
+    public void fillValues(Copyable original, CopyHandler handler) {
+        super.fillValues(original, handler);
+        Opening originalOpening = (Opening) original;
+        partOf = handler.getCopyInstance(originalOpening.partOf);
+        type = originalOpening.type;
+        featureType = originalOpening.featureType;
+        ao = originalOpening.ao;
+    }
 
 }