Refactor: Move method to Cache class

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/CityObjectCache.java

@@ -2,7 +2,9 @@ package de.hft.stuttgart.citydoctor2.database;
 
 import de.hft.stuttgart.citydoctor2.datastructure.CityObject;
 import de.hft.stuttgart.citydoctor2.datastructure.GmlId;
+import de.hft.stuttgart.citydoctor2.utils.Pair;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.lang.ref.SoftReference;
@@ -40,6 +42,17 @@ public class CityObjectCache {
         return cityObject;
     }
 
+    public static List<Pair<GmlId, List<GmlId>>> getCollidingObjectsList() {
+        List<Pair<GmlId, List<GmlId>>> collidingObjects = new ArrayList<>();
+        for (GmlId id : DatabaseHandler.getAllGmlIds()) {
+            List<GmlId> collidingIds = DatabaseHandler.getBBoxIntersectingObjects(id);
+            if (collidingIds != null && !collidingIds.isEmpty()) {
+                collidingObjects.add(new Pair<>(id, collidingIds));
+            }
+        }
+        return collidingObjects;
+    }
+
     public void remove(GmlId id) {
         cache.remove(id);
     }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/DatabaseHandler.java

@@ -125,6 +125,22 @@ public class DatabaseHandler {
         return cos;
     }
 
+    public static List<GmlId> getAllGmlIds() {
+        List<GmlId> cos = new ArrayList<>();
+        try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
+            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid FROM features")) {
+                ResultSet rs = ps.executeQuery();
+                while (rs.next()) {
+                    cos.add(new GmlId(rs.getString("gmlid")));
+                }
+            }
+        } catch (SQLException e) {
+            logger.error("Connection to database failed while trying to get all CityObjects!");
+            logger.debug(e.getMessage());
+        }
+        return cos;
+    }
+
     public static List<CityObject> getBufferIntersectingObjects(CityObject co, double bufferSize) {
         List<CityObject> intersectingObjects = new ArrayList<>();
         try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
@@ -161,11 +177,26 @@ public class DatabaseHandler {
         return intersectingObjects;
     }
 
-    public static List<Pair<CityObject, List<CityObject>>> getCollidingObjects() {
-        List<Pair<CityObject, List<CityObject>>> collidingObjects = new ArrayList<>();
-        // TODO: Implement query to return all Objects that have a collision and the list of whhich other objects collide
-        return collidingObjects;
+    public static List<GmlId> getBBoxIntersectingObjects(GmlId id) {
+        List<GmlId> intersectingObjects = new ArrayList<>();
+
+        try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
+            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid FROM features AS tab1" +
+                    " WHERE ST_INTERSECTS(tab1.bbox, (SELECT bbox FROM features WHERE gmlid = ?)) AND tab1.gmlid <> ?")) {
+                ps.setString(1, id.toString());
+                ps.setString(2, id.toString());
+                ResultSet rs = ps.executeQuery();
+                while (rs.next()) {
+                    intersectingObjects.add(new GmlId(rs.getString("gmlid")));
+                }
             }
+        } catch (SQLException e) {
+            logger.error("Connection to database failed while trying to get bbox intersecting objects!");
+            logger.debug(e.getMessage());
+        }
+        return intersectingObjects;
+    }
+
 
     public static int getFeatureCount() {
         int count = -1;