Fix: Filter Features before collision calculation

Filters out Water and Land Features before calculating FeatureCollisions
as these FeatureTypes will require separate, special checks.

CityDoctorParent/CityDoctorValidation/src/main/java/de/hft/stuttgart/citydoctor2/checks/topology/FeatureCollisionCheck.java

@@ -18,6 +18,7 @@ import de.hft.stuttgart.citydoctor2.datastructure.BridgeObject;
 import de.hft.stuttgart.citydoctor2.datastructure.Building;
 import de.hft.stuttgart.citydoctor2.datastructure.CityFurniture;
 import de.hft.stuttgart.citydoctor2.datastructure.CityObject;
+import de.hft.stuttgart.citydoctor2.datastructure.FeatureType;
 import de.hft.stuttgart.citydoctor2.datastructure.GenericCityObject;
 import de.hft.stuttgart.citydoctor2.datastructure.Geometry;
 import de.hft.stuttgart.citydoctor2.datastructure.LinearRing;
@@ -129,6 +130,10 @@ public class FeatureCollisionCheck extends Check{
 
     private void checkForFeatureCollisions(CityObject subject){
         Collection<CityObject> candidates = cache.getCandidates(subject, epsilon);
+        candidates = candidates.stream()
+                .filter(c -> c.getFeatureType() != FeatureType.LAND &&
+                        c.getFeatureType() != FeatureType.WATER )
+                .toList();
         List<Geometry> subjGeoms = new ArrayList<>();
         subject.accept(new CheckableUtilsVisitor() {
             @Override
@@ -189,8 +194,6 @@ public class FeatureCollisionCheck extends Check{
         return intersections;
     }
 
-
-
     @Override
     public Check createNewInstance() {
         return new FeatureCollisionCheck();