--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/tree/AbstractObservableTree.d	Tue Apr 21 10:55:51 2009 +0200
@@ -0,0 +1,151 @@
+/*******************************************************************************
+ * 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
+ *     Brad Reynolds - bug 164134
+ *******************************************************************************/
+
+package org.eclipse.core.internal.databinding.observable.tree;
+
+import org.eclipse.core.databinding.observable.AbstractObservable;
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.util.Policy;
+import org.eclipse.core.internal.databinding.BindingMessages;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.ListenerList;
+import org.eclipse.core.runtime.Status;
+
+/**
+ * @since 3.3
+ * 
+ */
+public abstract class AbstractObservableTree : AbstractObservable
+        , IObservableTree {
+
+    private bool stale;
+
+    private ListenerList treeListeners = new ListenerListcast(ListenerList.IDENTITY);
+
+    /**
+     * @param realm
+     */
+    public this(Realm realm) {
+        super(realm);
+    }
+
+    public void addChild(TreePath parentPath, Object childElement) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void addTreeChangeListener(ITreeChangeListener listener) {
+        treeListeners.add(listener);
+    }
+
+    public int getChildCount(TreePath parentPath) {
+        return getChildren(parentPath).length;
+    }
+
+    public bool hasChildren(TreePath parentPath) {
+        return getChildCount(parentPath) > 0;
+    }
+
+    public void insertChild(TreePath parentPath, int index, Object childElement) {
+        throw new UnsupportedOperationException();
+    }
+
+    public bool isLazy() {
+        return false;
+    }
+
+    public bool isOrdered() {
+        return false;
+    }
+
+    public void removeChild(TreePath parentPath, Object childElement) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void removeChild(TreePath parentPath, int index) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void removeTreeChangeListener(ITreeChangeListener listener) {
+        treeListeners.remove(listener);
+    }
+
+    public void setChildCount(TreePath parentPath, int count) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void setChildren(TreePath parentPath, Object[] children) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void updateChildren(IChildrenUpdate update) {
+        TreePath parent = update.getParent();
+        Object[] children = getChildren(parent);
+        for (int i = 0; i < update.getLength(); i++) {
+            int targetIndex = update.getOffset() + i;
+            if (targetIndex < children.length) {
+                update.setChild(children[targetIndex], targetIndex);
+            } else {
+                update
+                        .setStatus(new Status(
+                                IStatus.WARNING,
+                                Policy.JFACE_DATABINDING, 
+                                IStatus.OK,
+                                BindingMessages
+                                        .getStringcast(BindingMessages.INDEX_OUT_OF_RANGE), 
+                                        null));
+            }
+        }
+        update.done();
+    }
+
+    public void updateChildrenCount(IChildrenCountUpdate update) {
+        TreePath[] parents = update.getParents();
+        for (int i = 0; i < parents.length; i++) {
+            update.setChildCount(parents[i], getChildCount(parents[i]));
+        }
+        update.done();
+    }
+
+    public void updateHasChildren(IHasChildrenUpdate update) {
+        TreePath[] parents = update.getElements();
+        for (int i = 0; i < parents.length; i++) {
+            update.setHasChilren(parents[i], hasChildren(parents[i]));
+        }
+        update.done();
+    }
+
+    public bool isStale() {
+        return stale;
+    }
+
+    /**
+     * @param stale
+     */
+    public void setStale(bool stale) {
+        this.stale = stale;
+        if (stale) {
+            fireStale();
+        }
+    }
+
+    protected void fireTreeChange(TreeDiff diff) {
+        // fire general change event first
+        fireChange();
+
+        Object[] listeners = treeListeners.getListeners();
+        TreeChangeEvent event = new TreeChangeEvent(this, diff);
+        for (int i = 0; i < listeners.length; i++) {
+            (cast(ITreeChangeListener) listeners[i]).handleTreeChange(event);
+        }
+    }
+
+}