net.sf.javagimmicks.collections8.event.ObservableEventMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of gimmicks Show documentation

Utility classes, APIs and tools for Java

There is a newer version: 0.99-alpha1

package net.sf.javagimmicks.collections8.event;

import java.util.Map;

import net.sf.javagimmicks.collections8.event.MapEvent.Type;
import net.sf.javagimmicks.event.EventListener;
import net.sf.javagimmicks.event.Observable;
import net.sf.javagimmicks.event.ObservableBase;

/**
 * A {@link Map} decorator that serves as an {@link Observable} for
 * {@link MapEvent}s.
 */
public class ObservableEventMap extends AbstractEventMap implements
      Observable>
{
   private static final long serialVersionUID = 8006998141057065129L;

   protected final ObservableBase> _helper = new ObservableBase>();

   /**
    * Wraps a new {@link ObservableEventMap} around a given {@link Map}.
    * 
    * @param decorated
    *           the {@link Map} to wrap around
    */
   public ObservableEventMap(final Map decorated)
   {
      super(decorated);
   }

   @Override
   public >> void addEventListener(final L listener)
   {
      _helper.addEventListener(listener);
   }

   @Override
   public >> void removeEventListener(final L listener)
   {
      _helper.removeEventListener(listener);
   }

   @Override
   protected void fireEntryAdded(final K key, final V value)
   {
      _helper.fireEvent(new MapEventImpl(Type.ADDED, key, value));
   }

   @Override
   protected void fireEntryRemoved(final K key, final V value)
   {
      _helper.fireEvent(new MapEventImpl(Type.REMOVED, key, value));
   }

   @Override
   protected void fireEntryUpdated(final K key, final V oldValue, final V newValue)
   {
      _helper.fireEvent(new MapEventImpl(Type.UPDATED, key, oldValue, newValue));
   }

   private class MapEventImpl implements MapEvent
   {
      protected final Type _type;
      protected final K _key;
      protected final V _value;
      protected final V _newValue;

      public MapEventImpl(final Type type, final K key, final V value, final V newValue)
      {
         _type = type;
         _key = key;
         _value = value;
         _newValue = newValue;
      }

      public MapEventImpl(final Type type, final K key, final V value)
      {
         this(type, key, value, null);
      }

      @Override
      public ObservableEventMap getSource()
      {
         return ObservableEventMap.this;
      }

      @Override
      public Type getType()
      {
         return _type;
      }

      @Override
      public K getKey()
      {
         return _key;
      }

      @Override
      public V getValue()
      {
         return _value;
      }

      @Override
      public V getNewValue()
      {
         return _newValue;
      }
   }
}