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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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 .
+ */
+#ifndef __com_sun_star_uno_XAggregation_idl__
+#define __com_sun_star_uno_XAggregation_idl__
+
+#include <com/sun/star/uno/XInterface.idl>
+
+
+module com { module sun { module star { module uno {
+
+/** Objects which implement this interface can become aggregates of
+    a delegator.
+
+    <p>That means if an object "A" aggregates "B", "A" can provide all
+    or some of the interfaces of "B". Whenever the method
+    XInterface::queryInterface()
+    is called on either of the objects, the call will be forwarded
+    to object "A". Object "A" now can determine whether to use the
+    interfaces of "A" or "B" or neither. Actually, any number of
+    aggregates can be used, even nested ones (aggregated objects which are
+    delegators by themselves).
+
+    <p>The following rules are to be observed:
+    <ol>
+    <li>All calls to XInterface::acquire()
+    which are made before the delegator was set (using the method
+    XAggregation::setDelegator()) must not be taken back
+    (using the method XInterface::release())
+    before the delegation is removed by calling
+    <code>xAggregation-&gt;setDelegator(NULL)</code>.
+
+    <li>The constructor of a delegator has to increment its
+    own reference count by calling its method
+    XInterface::acquire()
+    before it sets itself to any aggregate using the method
+    XAggregation::setDelegator(). After that
+    call it has to reset its own reference count without the
+    destructor getting called.
+
+    <li>The destructor of a delegator has to reset the delegator in
+    its aggregated objects by calling their method
+    XAggregation::setDelegator() with
+    NULL before it releases its reference to
+    its aggregated objects.
+    </ol>
+
+    @deprecated
+    Aggregation will no longer be supported as a high-level concept of UNO.
+    You may still have the option to implement a UNO object consisting of
+    several single objects in your specific programming language, though this
+    depends on your programming language.
+*/
+published interface XAggregation: com::sun::star::uno::XInterface
+{
+    /** sets the object to which all calls to the method
+        XInterface::queryInterface()
+        have to be forwarded.
+
+        @param pDelegator
+        specifies the object which handles the calls to
+        XInterface::queryInterface().
+        If <var>pDelegator</var> is NULL, the delegator is
+        removed and thus the object becomes its own delegator and has
+        to handle calls to the method
+        XInterface::queryInterface()
+        itself.
+
+        @see XAggregation::queryAggregation
+    */
+    void setDelegator( [in] com::sun::star::uno::XInterface pDelegator );
+
+    /** is similar to XInterface::queryInterface(),
+        but it is to be processed directly without being forwarded to the
+        delegator.
+
+        <p>This method is only called from within an implementation of
+        XInterface::queryInterface()
+        or XAggregation::queryAggregation(). This method
+        is to be called by the delegator if it does not implement the
+        interface itself. An object which got aggregated cannot depend
+        on getting its own interface when it calls the method
+        XInterface::queryInterface().
+
+        @see XAggregation::setDelegator
+    */
+    any queryAggregation( [in] type aType );
+
+};
+
+
+}; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */