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diff --git a/extensions/source/bibliography/loadlisteneradapter.hxx b/extensions/source/bibliography/loadlisteneradapter.hxx
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+++ b/extensions/source/bibliography/loadlisteneradapter.hxx
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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 .
+ */
+
+#pragma once
+
+#include <osl/mutex.hxx>
+#include <com/sun/star/lang/XComponent.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/form/XLoadable.hpp>
+#include <rtl/ref.hxx>
+
+
+namespace bib
+{
+
+
+    class OComponentAdapterBase;
+
+    class OComponentListener
+    {
+        friend class OComponentAdapterBase;
+
+    private:
+        rtl::Reference<OComponentAdapterBase>  m_xAdapter;
+        ::osl::Mutex&                          m_rMutex;
+    protected:
+        explicit OComponentListener( ::osl::Mutex& _rMutex )
+            :m_rMutex( _rMutex )
+        {
+        }
+
+        virtual ~OComponentListener();
+
+    protected:
+        void setAdapter( OComponentAdapterBase* _pAdapter );
+    };
+
+    class OComponentAdapterBase
+    {
+        friend class OComponentListener;
+
+    private:
+        css::uno::Reference< css::lang::XComponent >  m_xComponent;
+        OComponentListener*                 m_pListener;
+        bool                                m_bListening    : 1;
+
+        // impl method for dispose - virtual, 'cause you at least need to remove the listener from the broadcaster
+        virtual void disposing() = 0;
+
+    protected:
+        // attribute access for derivees
+        const css::uno::Reference< css::lang::XComponent >&
+                                getComponent() const    { return m_xComponent; }
+        OComponentListener*     getListener()           { return m_pListener; }
+
+        // to be called by derivees which started listening at the component
+        virtual void    startComponentListening() = 0;
+
+        virtual ~OComponentAdapterBase();
+
+    public:
+        explicit OComponentAdapterBase(
+            const css::uno::Reference< css::lang::XComponent >& _rxComp
+        );
+
+        // late construction
+        // can be called from within you ctor, to have you're object fully initialized at the moment of
+        // the call (which would not be the case when calling this ctor)
+        void Init( OComponentListener* _pListener );
+
+    // base for ref-counting, implemented by OComponentAdapter
+        virtual void SAL_CALL acquire(  ) noexcept = 0;
+        virtual void SAL_CALL release(  ) noexcept = 0;
+
+        /// dispose the object - stop listening and such
+        void dispose();
+
+    protected:
+    // XEventListener
+        /// @throws css::uno::RuntimeException
+        virtual void SAL_CALL disposing( const  css::lang::EventObject& Source );
+    };
+
+    class OLoadListener : public OComponentListener
+    {
+        friend class OLoadListenerAdapter;
+
+    protected:
+        explicit OLoadListener( ::osl::Mutex& _rMutex ) : OComponentListener( _rMutex ) { }
+
+    // XLoadListener equivalents
+        virtual void _loaded( const css::lang::EventObject& aEvent ) = 0;
+        virtual void _unloading( const css::lang::EventObject& aEvent ) = 0;
+        virtual void _reloading( const css::lang::EventObject& aEvent ) = 0;
+        virtual void _reloaded( const css::lang::EventObject& aEvent ) = 0;
+    };
+
+    typedef ::cppu::WeakImplHelper< css::form::XLoadListener >    OLoadListenerAdapter_Base;
+    class OLoadListenerAdapter
+        :public OLoadListenerAdapter_Base
+        ,public OComponentAdapterBase
+    {
+    protected:
+        OLoadListener*      getLoadListener( )  { return static_cast< OLoadListener* >( getListener() ); }
+
+    protected:
+        virtual void    disposing() override;
+        virtual void    startComponentListening() override;
+
+    public:
+        explicit OLoadListenerAdapter(
+            const css::uno::Reference< css::form::XLoadable >& _rxLoadable
+        );
+
+
+        virtual void SAL_CALL acquire(  ) noexcept override;
+        virtual void SAL_CALL release(  ) noexcept override;
+
+    protected:
+    // XEventListener
+        virtual void SAL_CALL disposing( const  css::lang::EventObject& _rSource ) override;
+
+    // XLoadListener
+        virtual void SAL_CALL loaded( const css::lang::EventObject& aEvent ) override;
+        virtual void SAL_CALL unloading( const css::lang::EventObject& aEvent ) override;
+        virtual void SAL_CALL unloaded( const css::lang::EventObject& aEvent ) override;
+        virtual void SAL_CALL reloading( const css::lang::EventObject& aEvent ) override;
+        virtual void SAL_CALL reloaded( const css::lang::EventObject& aEvent ) override;
+    };
+
+
+}   // namespace bib
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */