--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/ChangeSupport.d	Tue Apr 21 10:55:51 2009 +0200
@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2006, 2007 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.core.databinding.observable;
+
+/**
+ * @since 1.0
+ *
+ */
+public abstract class ChangeSupport : ChangeManager {
+
+    /**
+     * @param realm 
+     */
+    public this(Realm realm) {
+        super(realm);
+    }
+    
+    public void addListener(Object listenerType,
+            IObservablesListener listener) {
+        super.addListener(listenerType, listener);
+    }
+    
+    public void removeListener(Object listenerType,
+            IObservablesListener listener) {
+        super.removeListener(listenerType, listener);
+    }
+    
+    public void fireEvent(ObservableEvent event) {
+        super.fireEvent(event);
+    }
+    
+    /**
+     * 
+     */
+    protected abstract void firstListenerAdded();
+    
+    /**
+     * 
+     */
+    protected abstract void lastListenerRemoved();
+
+    /**
+     * @param listener
+     */
+    public void addChangeListener(IChangeListener listener) {
+        addListener(ChangeEvent.TYPE, listener);
+    }
+    
+    /**
+     * @param listener
+     */
+    public void removeChangeListener(IChangeListener listener) {
+        removeListener(ChangeEvent.TYPE, listener);
+    }
+
+    /**
+     * @param listener
+     */
+    public void addStaleListener(IStaleListener listener) {
+        addListener(StaleEvent.TYPE, listener);
+    }
+    
+    /**
+     * @param listener
+     */
+    public void removeStaleListener(IStaleListener listener) {
+        removeListener(StaleEvent.TYPE, listener);
+    }
+    
+}