Fix: Cached CityObjects leaking to other files

Invalidates all Cache entries before starting parsing of a new file to
prevent cached CityObjects being unintentionally transferred to wrong
database table.

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

@@ -18,6 +18,7 @@ public class CacheManager {
         if (cache == null){
             cache = new FeatureCache(filename);
         } else {
+            cache.resetCache();
             cache.changeFileName(filename);
         }
         return cache;

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

@@ -19,4 +19,5 @@ public interface CityObjectCache {
 
     int getFeatureCount();
 
+    void resetCache();
 }

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

@@ -65,6 +65,10 @@ public class FeatureCache implements CityObjectCache{
         return handler.getFeatureCount();
     }
 
+    @Override
+    public void resetCache(){
+        cache.invalidateAll();
+    }
 
 }
 

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

@@ -44,4 +44,8 @@ public class UnconnectedCache implements CityObjectCache{
     public int getFeatureCount() {
         return cache.size();
     }
+
+    public void resetCache(){
+        cache.clear();
+    }
 }