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diff --git a/ridljar/com/sun/star/lib/util/DisposeNotifier.java b/ridljar/com/sun/star/lib/util/DisposeNotifier.java
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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+package com.sun.star.lib.util;
+
+/**
+ * Optional interface to be implemented by objects stored in a
+ * <code>WeakMap</code>.
+ *
+ * @see WeakMap
+ */
+public interface DisposeNotifier {
+    /**
+     * Adds a dispose listener, to be notified when this object is disposed.
+     *
+     * <p>It is unspecified what happens when the same listener is added
+     * multiple times.</p>
+     *
+     * <p>It is unspecified exactly when the <code>notifyDispose</code> callback
+     * is fired: immediately before the notifier is disposed, while it is in the
+     * process of disposing, or some time after it got disposed.  But even if
+     * adding a listener to an already disposed notifier, the listener must
+     * eventually receive a <code>notifyDispose</code> callback.</p>
+     *
+     * @param listener a dispose listener, to be notified when this object is
+     * disposed; must not be <code>null</code>
+     */
+    void addDisposeListener(DisposeListener listener);
+}