Feat: Implement getCandidates

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

@@ -22,6 +22,8 @@ public interface CityObjectCache {
      */
     CityObject get(GmlId id);
 
+    Collection<CityObject> getCandidates(CityObject subject, double collectionRadius);
+
 
     Collection<CityObject> getAll(List<GmlId> ids);
     /**

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

@@ -119,6 +119,12 @@ public class FeatureCache implements CityObjectCache{
         return cache.get(id);
     }
 
+    @Override
+    public Collection<CityObject> getCandidates(CityObject subject, double collectionRadius){
+        List<GmlId> ids = handler.getBufferCollisionCandidates(subject, collectionRadius);
+        return this.getAll(ids);
+    }
+
     @Override
     public Collection<CityObject> getAll(List<GmlId> ids){
         Map<GmlId, CityObject> map = cache.getAll(new HashSet<>(ids));

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

@@ -38,6 +38,19 @@ public class UnconnectedCache implements CityObjectCache{
         return cache.get(id);
     }
 
+    @Override
+    public Collection<CityObject> getCandidates(CityObject subject, double collectionRadius) {
+        List<CityObject> candidates =  new ArrayList<>();
+        // Quick and dirty candidate selection
+        cache.forEach((gmlId, cityObject) -> {
+            double distance = cityObject.getBbox().getCenter().getDistance(subject.getBbox().getCenter());
+            if (distance - cityObject.getBbox().getLongestSide() - subject.getBbox().getLongestSide() < collectionRadius){
+                candidates.add(cityObject);
+            }
+        });
+        return candidates;
+    }
+
     @Override
     public Collection<CityObject> getAll(List<GmlId> ids) {
        return ids.stream().map(cache::get).toList();