--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/set/ListToSetAdapter.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,86 @@
+/*******************************************************************************
+ * 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.core.databinding.observable.set.ListToSetAdapter;
+
+import java.lang.all;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.core.databinding.observable.Diffs;
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.observable.list.IListChangeListener;
+import org.eclipse.core.databinding.observable.list.IObservableList;
+import org.eclipse.core.databinding.observable.list.ListChangeEvent;
+import org.eclipse.core.databinding.observable.list.ListDiffEntry;
+
+/**
+ * Observable set backed by an observable list. The wrapped list must not
+ * contain duplicate elements.
+ * 
+ * <p>
+ * This class is thread safe. All state accessing methods must be invoked from
+ * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
+ * listeners may be invoked from any thread.
+ * </p>
+ * 
+ * @since 1.0
+ * 
+ */
+public class ListToSetAdapter : ObservableSet {
+
+    private final IObservableList list;
+
+    private IListChangeListener listener = new class() IListChangeListener {
+
+        public void handleListChange(ListChangeEvent event) {
+            Set added = new HashSet();
+            Set removed = new HashSet();
+            ListDiffEntry[] differences = event.diff.getDifferences();
+            for (int i = 0; i < differences.length; i++) {
+                ListDiffEntry entry = differences[i];
+                Object element = entry.getElement();
+                if (entry.isAddition()) {
+                    if (wrappedSet.add(element)) {
+                        if (!removed.remove(element))
+                            added.add(element);
+                    }
+                } else {
+                    if (wrappedSet.remove(element)) {
+                        removed.add(element);
+                        added.remove(element);
+                    }
+                }
+            }
+            fireSetChange(Diffs.createSetDiff(added, removed));
+        }
+    };
+
+    /**
+     * @param list
+     */
+    public this(IObservableList list) {
+        super(list.getRealm(), new HashSet(), list.getElementType());
+        this.list = list;
+        wrappedSet.addAll(list);
+        this.list.addListChangeListener(listener);
+    }
+
+    public synchronized void dispose() {
+        super.dispose();
+        if (list !is null && listener !is null) {
+            list.removeListChangeListener(listener);
+            listener = null;
+        }
+    }
+
+}