Implemented Connection creation in event classes

git-svn-id: svn://sunsvr01.isp.uni-luebeck.de/swproj13/trunk@151 72836036-5685-4462-b002-a69064685172

src/jrummikub/util/Event.java

@@ -7,9 +7,15 @@ public class Event implements IEvent {
   private HashSet<IListener> listeners = new HashSet<IListener>();
 
   @Override
-  public Connection add(IListener listener) {
+  public Connection add(final IListener listener) {
     listeners.add(listener);
-    return null;
+    return new Connection() {
+		
+		@Override
+		public void remove() {
+			Event.this.remove(listener);
+		}
+	};
   }
 
   @Override

src/jrummikub/util/Event1.java

@@ -12,9 +12,15 @@ public class Event1<T> implements IEvent1<T> {
 	private HashSet<IListener1<T>> listeners = new HashSet<IListener1<T>>();
 
 	@Override
-	public Connection add(IListener1<T> listener) {
+	public Connection add(final IListener1<T> listener) {
 		listeners.add(listener);
-		return null;
+	    return new Connection() {
+			
+			@Override
+			public void remove() {
+				Event1.this.remove(listener);
+			}
+		};
 	}
 
 	@Override

src/jrummikub/util/Event2.java

@@ -14,9 +14,15 @@ public class Event2<T1, T2> implements IEvent2<T1, T2> {
 	private HashSet<IListener2<T1, T2>> listeners = new HashSet<IListener2<T1, T2>>();
 
 	@Override
-	public Connection add(IListener2<T1, T2> listener) {
+	public Connection add(final IListener2<T1, T2> listener) {
 		listeners.add(listener);
-		return null;
+	    return new Connection() {
+			
+			@Override
+			public void remove() {
+				Event2.this.remove(listener);
+			}
+		};
 	}
 
 	@Override