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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: backendnotifier.hxx,v $
+ * $Revision: 1.4 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+#ifndef CONFIGMGR_BACKEND_BACKENDNOTIFIER_HXX
+#define CONFIGMGR_BACKEND_BACKENDNOTIFIER_HXX
+
+#include "mergeddataprovider.hxx"
+#include <com/sun/star/configuration/backend/XBackend.hpp>
+#include <com/sun/star/configuration/backend/XBackendChangesNotifier.hpp>
+#include <osl/mutex.hxx>
+#include <cppuhelper/implbase1.hxx>
+
+#ifndef INCLUDED_MAP
+#include <map>
+#define INCLUDED_MAP
+#endif
+
+#ifndef INCLUDED_LIST
+#include <list>
+#define INCLUDED_LIST
+#endif
+
+
+namespace configmgr
+{
+// ---------------------------------------------------------------------------
+    namespace backend
+    {
+    namespace uno       = ::com::sun::star::uno;
+    namespace lang      = ::com::sun::star::lang;
+    namespace backenduno = ::com::sun::star::configuration::backend;
+// ---------------------------------------------------------------------------
+    struct ComponentListener
+    {
+        explicit
+        ComponentListener(INodeDataListener * _xListener, RequestOptions _aOptions):
+        m_aListener( _xListener),
+        m_aOptions(_aOptions)
+        {}
+
+        bool operator==(const ComponentListener& _aListener)const
+        {
+            return ( (&m_aListener == &_aListener.m_aListener)&&
+                     (compareRequestOptions(m_aOptions, _aListener.m_aOptions)== 0) );
+
+        }
+        INodeDataListener * m_aListener;
+        RequestOptions m_aOptions;
+    };
+
+    /** Class used to store ComponentListener(listener and options)
+    */
+    class ComponentNotifier
+    {
+    public:
+        ComponentNotifier();
+        void addListenerToList(const ComponentListener& _aListener);
+        void removeListenerFromList(const ComponentListener& _aListener);
+        bool isListEmpty(){ return m_aListenerList.empty();}
+        void notifyListeners(const rtl::OUString& _aComponent);
+    private:
+        std::list<ComponentListener> m_aListenerList;
+    };
+    // ---------------------------------------------------------------------------
+    /** Interface providing a multicasting service for changes in the backend
+     */
+    class BackendChangeNotifier :public cppu::WeakImplHelper1<backenduno::XBackendChangesListener>
+    {
+    public:
+        BackendChangeNotifier(const uno::Reference<backenduno::XBackend>& _xBackend);
+        ~BackendChangeNotifier();
+
+        virtual void SAL_CALL componentDataChanged(const backenduno::ComponentChangeEvent& aEvent)
+        throw (::com::sun::star::uno::RuntimeException);
+
+        virtual void SAL_CALL disposing( lang::EventObject const & rSource )
+            throw (uno::RuntimeException);
+      // notification support.
+        /// register a listener for observing changes to the cached data
+        void addListener(INodeDataListener * _xListener, const ComponentRequest& _aRequest) SAL_THROW(());
+        /// unregister a listener previously registered
+        void removeListener(INodeDataListener * _xListener, const ComponentRequest& _aRequest) SAL_THROW(());
+    private:
+        osl::Mutex   m_aMutex;
+        std::map<rtl::OUString, ComponentNotifier> m_aListeners;
+
+        /** Backend being accessed */
+        uno::Reference<backenduno::XBackendChangesNotifier> m_aBackend ;
+    };
+// ---------------------------------------------------------------------------
+ } // namespace backend
+
+// ---------------------------------------------------------------------------
+} // namespace configmgr
+
+#endif
+