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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 INCLUDED_COMPHELPER_ACCIMPLACCESS_HXX
+#define INCLUDED_COMPHELPER_ACCIMPLACCESS_HXX
+
+#include <cppuhelper/implbase1.hxx>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <comphelper/comphelperdllapi.h>
+
+namespace comphelper
+{
+    //= OAccessibleImplementationAccess
+
+    typedef ::cppu::ImplHelper1 <   css::lang::XUnoTunnel
+                                >   OAccImpl_Base;
+
+    /** This is a helper class which allows accessing several aspects of the implementation
+        of an AccessibleContext.
+
+        <p>For instance, when you want to implement a context which can be re-parented, you:
+            <ul><li>derive your class from OAccessibleImplementationAccess</li>
+                <li>use <code>setAccessibleParent( <em>component</em>, <em>new_parent</em> )</code>
+            </ul>
+        </p>
+
+        <p>Another aspect which can be controlled from the outside are states. If you have a class which
+        has only partial control over it's states, you may consider deriving from OAccessibleImplementationAccess.<br/>
+        For instance, say you have an implementation (say component A) which is <em>unable</em> to know or to
+        determine if the represented object is selected, but another component (say B) which uses A (and integrates
+        it into a tree of accessibility components) is.<br/>
+        In this case, if A is derived from OAccessibleImplementationAccess, B can manipulate this
+        foreign-controlled state flag "SELECTED" by using the static helper methods on this class.</p>
+
+        <p>Please note that the support for foreign controlled states is rather restrictive: You can't have states
+        which <em>may be</em> controlled by a foreign instances. This is implied by the fact that a derived
+        class can ask for states which are <em>set</em> only, not for the ones which are <em>reset</em> currently.
+        </p>
+    */
+    class COMPHELPER_DLLPUBLIC OAccessibleImplementationAccess : public OAccImpl_Base
+    {
+    protected:
+        OAccessibleImplementationAccess( );
+        virtual ~OAccessibleImplementationAccess( );
+
+        // XUnoTunnel
+        virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& _rIdentifier ) override;
+
+    public:
+
+    private:
+        COMPHELPER_DLLPRIVATE static css::uno::Sequence< sal_Int8 > getUnoTunnelImplementationId();
+    };
+
+} // namespace comphelper
+
+#endif // INCLUDED_COMPHELPER_ACCIMPLACCESS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */