--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/map/MapDiff.d	Tue Apr 21 10:55:51 2009 +0200
@@ -0,0 +1,54 @@
+/*******************************************************************************
+ * 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.map;
+
+import java.util.Set;
+
+/**
+ * @since 1.1
+ * 
+ */
+public abstract class MapDiff {
+
+    /**
+     * @return the set of keys which were added
+     */
+    public abstract Set getAddedKeys();
+
+    /**
+     * @return the set of keys which were removed
+     */
+    public abstract Set getRemovedKeys();
+
+    /**
+     * @return the set of keys for which the value has changed
+     */
+    public abstract Set getChangedKeys();
+
+    /**
+     * Returns the old value for the given key, which must be an element of
+     * {@link #getRemovedKeys()} or {@link #getChangedKeys()}.
+     * 
+     * @param key
+     * @return the old value for the given key.
+     */
+    public abstract Object getOldValue(Object key);
+
+    /**
+     * Returns the new value for the given key, which must be an element of
+     * {@link #getChangedKeys()} or {@link #getAddedKeys()}.
+     * 
+     * @param key
+     * @return the new value for the given key.
+     */
+    public abstract Object getNewValue(Object key);
+}