--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ObservableSetTreeContentProvider.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,164 @@
+/*******************************************************************************
+ * Copyright (c) 2008 Matthew Hall 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:
+ *     Matthew Hall - initial API and implementation (bug 207858)
+ *     Matthew Hall - bug 226765
+ *******************************************************************************/
+
+module org.eclipse.jface.databinding.viewers.ObservableSetTreeContentProvider;
+
+import java.lang.all;
+
+import java.util.Iterator;
+import java.util.Set;
+
+import org.eclipse.core.databinding.observable.IObservableCollection;
+import org.eclipse.core.databinding.observable.IObservablesListener;
+import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
+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.viewers.ObservableCollectionTreeContentProvider;
+import org.eclipse.jface.viewers.AbstractTreeViewer;
+import org.eclipse.jface.viewers.ITreeContentProvider;
+import org.eclipse.jface.viewers.Viewer;
+
+/**
+ * An {@link ITreeContentProvider} for use with an {@link AbstractTreeViewer},
+ * which uses the provided {@link IObservableFactory set factory} to obtain the
+ * elements of a tree. Objects of this class listen for changes to each
+ * {@link IObservableSet} created by the factory, and will insert and remove
+ * viewer elements to reflect the observed changes.
+ * 
+ * <p>
+ * This class is not intended to be subclassed by clients.
+ * 
+ * @since 1.2
+ */
+public class ObservableSetTreeContentProvider : ITreeContentProvider {
+    private final ObservableCollectionTreeContentProvider impl;
+
+    private static class Impl : ObservableCollectionTreeContentProvider {
+        this(IObservableFactory setFactory,
+                TreeStructureAdvisor structureAdvisor) {
+            super(setFactory, structureAdvisor);
+        }
+
+        private class SetChangeListener : ISetChangeListener {
+            final Object parentElement;
+
+            public this(Object parentElement) {
+                this.parentElement = parentElement;
+            }
+
+            public void handleSetChange(SetChangeEvent event) {
+                if (isViewerDisposed())
+                    return;
+
+                Set removals = event.diff.getRemovals();
+                if (!removals.isEmpty()) {
+                    viewerUpdater.remove(parentElement, removals.toArray());
+                    for (Iterator iterator = removals.iterator(); iterator
+                            .hasNext();) {
+                        Object child = iterator.next();
+                        TreeNode childNode = getExistingNode(child);
+                        if (childNode !is null)
+                            childNode.removeParent(parentElement);
+                    }
+                }
+
+                Set additions = event.diff.getAdditions();
+                if (!additions.isEmpty()) {
+                    for (Iterator iterator = additions.iterator(); iterator
+                            .hasNext();) {
+                        Object child = iterator.next();
+                        getOrCreateNode(child).addParent(parentElement);
+                    }
+                    viewerUpdater.add(parentElement, additions.toArray());
+                }
+            }
+        }
+
+        protected IObservablesListener createCollectionChangeListener(
+                Object parentElement) {
+            return new SetChangeListener(parentElement);
+        }
+
+        protected void addCollectionChangeListener(
+                IObservableCollection collection, IObservablesListener listener) {
+            IObservableSet set = cast(IObservableSet) collection;
+            ISetChangeListener setListener = cast(ISetChangeListener) listener;
+            set.addSetChangeListener(setListener);
+        }
+
+        protected void removeCollectionChangeListener(
+                IObservableCollection collection, IObservablesListener listener) {
+            IObservableSet set = cast(IObservableSet) collection;
+            ISetChangeListener setListener = cast(ISetChangeListener) listener;
+            set.removeSetChangeListener(setListener);
+        }
+    }
+
+    /**
+     * Constructs an ObservableListTreeContentProvider using the given list
+     * factory.
+     * 
+     * @param setFactory
+     *            observable factory that produces an IObservableSet of children
+     *            for a given parent element. Observable sets created by this
+     *            factory must be on the realm of the current display.
+     * @param structureAdvisor
+     *            an advisor that will be consulted from the implementations of
+     *            the {@link #getParent(Object)} and
+     *            {@link #hasChildren(Object)} methods, or <code>null</code>
+     *            if no advisor is available. It is recommended that clients
+     *            pass a non-null advisor if they can provide additional
+     *            structural information about the tree.
+     */
+    public this(IObservableFactory setFactory,
+            TreeStructureAdvisor structureAdvisor) {
+        impl = new Impl(setFactory, structureAdvisor);
+    }
+
+    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+        impl.inputChanged(viewer, oldInput, newInput);
+    }
+
+    public Object[] getElements(Object inputElement) {
+        return impl.getElements(inputElement);
+    }
+
+    public bool hasChildren(Object element) {
+        return impl.hasChildren(element);
+    }
+
+    public Object[] getChildren(Object parentElement) {
+        return impl.getChildren(parentElement);
+    }
+
+    public Object getParent(Object element) {
+        return impl.getParent(element);
+    }
+
+    public void dispose() {
+        impl.dispose();
+    }
+
+    /**
+     * Returns the set of elements known to this content provider. Label
+     * providers may track this set if they need to be notified about additions
+     * before the viewer sees the added element, and notified about removals
+     * after the element was removed from the viewer. This is intended for use
+     * by label providers, as it will always return the items that need labels.
+     * 
+     * @return readableSet of items that will need labels
+     */
+    public IObservableSet getKnownElements() {
+        return impl.getKnownElements();
+    }
+}