Fix: Clear ImplicitGeometry Object maps before parsing

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

@@ -24,6 +24,9 @@ public class ImplicitGeometryHolder extends Geometry {
     private static final long serialVersionUID = -8938931081577196349L;
     private static final Logger logger = LogManager.getLogger(ImplicitGeometryHolder.class);
 
+    public enum PrototypeGeometryType {
+        LIBRARY_OBJECT, RELATIVE_GEOMETRY
+    }
 
     private ImplicitGeometry cgmlImplicitGeometry = null;
     private static ConcurrentHashMap<ImplicitGeometryHolder, ImplicitGeometry> deferredRelGeomObjects = new ConcurrentHashMap<>();
@@ -101,9 +104,12 @@ public class ImplicitGeometryHolder extends Geometry {
         return type;
     }
 
-    @Override
-    public void accept(CheckableVisitor c) {
-        prototypeGeometry.accept(c);
+    /**
+     * Resets the Object maps of {@link RelativeGeometry} and {@link LibraryObject} to prevent memory and data leaks
+     */
+    public static void resetObjectMaps() {
+        RelativeGeometry.resetObjectMap();
+        LibraryObject.resetObjectMap();
     }
 
     @Override
@@ -111,8 +117,5 @@ public class ImplicitGeometryHolder extends Geometry {
         return prototypeGeometry.isValidated();
     }
 
-    public enum PrototypeGeometryType {
-        LIBRARY_OBJECT, RELATIVE_GEOMETRY
-    }
 
 }

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

@@ -80,4 +80,7 @@ public class LibraryObject extends Geometry {
     }
 
 
+    public static void resetObjectMap() {
+        libraryObjects.clear();
+    }
 }

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

@@ -34,4 +34,8 @@ public class RelativeGeometry extends Geometry {
 	private RelativeGeometry(GeometryType type, Lod lod, Orientation orientation) {
 		super(type, lod, orientation);
 	}
+
+	public static void resetObjectMap() {
+		relativeGeometries.clear();
+	}
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/mapper/citygml3/Citygml3FeatureMapper.java

@@ -182,6 +182,7 @@ public class Citygml3FeatureMapper extends ObjectWalker {
 			model = new CityDoctorModel(config, path.toFile(), new UnconnectedCache());
 		} else {
 			featureCache.resetCache();
+			ImplicitGeometryHolder.resetObjectMaps();
 			model = new CityDoctorModel(config, path.toFile(), featureCache);
 		}
         neighborDistance = 1.8d / Math.pow(10, config.getNumberOfRoundingPlaces());