--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ListeningLabelProvider.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,70 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+
+module org.eclipse.jface.databinding.viewers.ListeningLabelProvider;
+
+import java.lang.all;
+
+import java.util.Iterator;
+
+import org.eclipse.core.databinding.observable.set.IObservableSet;
+import org.eclipse.core.databinding.observable.set.ISetChangeListener;
+import org.eclipse.core.databinding.observable.set.SetChangeEvent;
+import org.eclipse.jface.internal.databinding.provisional.viewers.ViewerLabelProvider;
+
+/**
+ * @since 1.1
+ * 
+ */
+public abstract class ListeningLabelProvider : ViewerLabelProvider {
+
+    private ISetChangeListener listener = new class() ISetChangeListener {
+        public void handleSetChange(SetChangeEvent event) {
+            for (Iterator it = event.diff.getAdditions().iterator(); it.hasNext();) {
+                addListenerTo(it.next());
+            }
+            for (Iterator it = event.diff.getRemovals().iterator(); it.hasNext();) {
+                removeListenerFrom(it.next());
+            }
+        }
+    };
+
+    private IObservableSet items;
+
+    /**
+     * @param itemsThatNeedLabels
+     */
+    public this(IObservableSet itemsThatNeedLabels) {
+        this.items = itemsThatNeedLabels;
+        items.addSetChangeListener(listener);
+        for (Iterator it = items.iterator(); it.hasNext();) {
+            addListenerTo(it.next());
+        }
+    }
+
+    /**
+     * @param next
+     */
+    protected abstract void removeListenerFrom(Object next);
+
+    /**
+     * @param next
+     */
+    protected abstract void addListenerTo(Object next);
+
+    public void dispose() {
+        for (Iterator iter = items.iterator(); iter.hasNext();) {
+            removeListenerFrom(iter.next());
+        }
+        items.removeSetChangeListener(listener);
+        super.dispose();
+    }
+}