Refactor: Improve toString() method

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/utils/CollisionRecord.java

@@ -4,6 +4,7 @@ import de.hft.stuttgart.citydoctor2.datastructure.CityObject;
 import de.hft.stuttgart.citydoctor2.datastructure.Geometry;
 import de.hft.stuttgart.citydoctor2.datastructure.GmlId;
 import de.hft.stuttgart.citydoctor2.datastructure.Polygon;
+import org.jspecify.annotations.NonNull;
 
 import java.io.Serializable;
 import java.util.ArrayList;
@@ -11,6 +12,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.StringJoiner;
 
 
 public record CollisionRecord(Geometry subjectGeom, Geometry collidingGeom, GmlId subjectFeatureId,
@@ -33,4 +35,27 @@ public record CollisionRecord(Geometry subjectGeom, Geometry collidingGeom, GmlI
         return Collections.unmodifiableMap(collisionMap);
     }
 
+    @Override
+    public @NonNull String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("CollisionRecord{ ");
+        sb.append("subjectFeature=").append(subjectFeatureId).append("; ");
+        sb.append("subjectGeom=").append(subjectGeom).append("; ");
+        sb.append("collidingFeature=").append(collidingFeatureId).append("; ");
+        sb.append("collidingGeom=").append(collidingGeom).append("; ");
+        sb.append("collisionMap=");
+        StringJoiner joiner = new StringJoiner(", ", "[","]; ");
+        for (Map.Entry<Polygon, List<Polygon>> entry : collisionMap.entrySet()) {
+            StringBuilder builder = new StringBuilder();
+            builder.append("{ subjectPolygon=").append(entry.getKey()).append("; ");
+            StringJoiner sj = new StringJoiner(", ","[","]; ");
+            sj.setEmptyValue("NULL");
+            entry.getValue().forEach(poly -> sj.add(poly.toString()));
+            builder.append("collidingPolygons=").append(sj).append("} ");
+            joiner.add(builder.toString());
+        }
+        sb.append(joiner);
+        sb.append("}");
+        return sb.toString();
+    }
 }