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  package org.apache.cayenne.reflect.valueholder;
  
  import java.util.Map;
  
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.ValueHolder;
  import org.apache.cayenne.reflect.Accessor;
  import org.apache.cayenne.reflect.ClassDescriptor;
  import org.apache.cayenne.reflect.PropertyException;
  import org.apache.cayenne.reflect.ToManyMapProperty;
  import org.apache.cayenne.util.PersistentObjectMap;
  
  /**
   * @since 3.0
   */
  class ValueHolderMapProperty extends ValueHolderToManyProperty implements
          ToManyMapProperty {
  
      private Accessor mapKeyAccessor;
  
      ValueHolderMapProperty(ClassDescriptor owner, ClassDescriptor targetDescriptor,
              Accessor accessor, String reverseName, Accessor mapKeyAccessor) {
          super(owner, targetDescriptor, accessor, reverseName);
          this.mapKeyAccessor = mapKeyAccessor;
      }
  
      @Override
      public void addTarget(Object source, Object target, boolean setReverse) {
  
          if (target == null) {
              throw new NullPointerException("Attempt to add null object.");
          }
  
          // Now do the rest of the normal handling (regardless of whether it was
          // flattened or not)
          Map<Object, Object> collection = (Map<Object, Object>) readProperty(source);
          collection.put(getMapKey(target), target);
  
          if (setReverse) {
              setReverse(source, null, target);
          }
      }
      
      @Override
      public void addTargetDirectly(Object source, Object target) throws PropertyException {
          PersistentObjectMap collection = (PersistentObjectMap) readProperty(source);
          collection.putDirectly(getMapKey(target), target);
      }
  
      @Override
      public void removeTarget(Object source, Object target, boolean setReverse) {
  
          // Now do the rest of the normal handling (regardless of whether it was
          // flattened or not)
          Map<Object, Object> collection = (Map<Object, Object>) readProperty(source);
          collection.remove(getMapKey(target));
  
          if (target != null && setReverse) {
              setReverse(source, target, null);
          }
      }
      
      @Override
      public void removeTargetDirectly(Object source, Object target) throws PropertyException {
          PersistentObjectMap collection = (PersistentObjectMap) readProperty(source);
          collection.removeDirectly(getMapKey(target));
      }
  
      @Override
      protected ValueHolder createCollectionValueHolder(Object object)
              throws PropertyException {
          if (!(object instanceof Persistent)) {
  
              throw new PropertyException(
                      "ValueHolders for non-persistent objects are not supported.",
                      this,
                      object);
          }
  
          return new PersistentObjectMap((Persistent) object, getName(), mapKeyAccessor);
      }
  
      public Object getMapKey(Object target) throws PropertyException {
          return mapKeyAccessor.getValue(target);
      }
  }
  