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diff --git a/chart2/source/model/main/Wall.hxx b/chart2/source/model/main/Wall.hxx
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+++ b/chart2/source/model/main/Wall.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 .
+ */
+#ifndef INCLUDED_CHART2_SOURCE_MODEL_MAIN_WALL_HXX
+#define INCLUDED_CHART2_SOURCE_MODEL_MAIN_WALL_HXX
+
+#include <com/sun/star/util/XCloneable.hpp>
+#include <com/sun/star/util/XModifyBroadcaster.hpp>
+#include <com/sun/star/util/XModifyListener.hpp>
+#include <MutexContainer.hxx>
+#include <OPropertySet.hxx>
+
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/uno3.hxx>
+
+namespace chart
+{
+
+namespace impl
+{
+typedef ::cppu::WeakImplHelper<
+        css::util::XCloneable,
+        css::util::XModifyBroadcaster,
+        css::util::XModifyListener >
+    Wall_Base;
+}
+
+class Wall final :
+    public MutexContainer,
+    public impl::Wall_Base,
+    public ::property::OPropertySet
+{
+public:
+    Wall();
+    virtual ~Wall() override;
+
+    /// merge XInterface implementations
+     DECLARE_XINTERFACE()
+
+private:
+    explicit Wall( const Wall & rOther );
+
+    // ____ OPropertySet ____
+    virtual css::uno::Any GetDefaultValue( sal_Int32 nHandle ) const override;
+
+    // ____ OPropertySet ____
+    virtual ::cppu::IPropertyArrayHelper & SAL_CALL getInfoHelper() override;
+
+    // ____ XPropertySet ____
+    virtual css::uno::Reference< css::beans::XPropertySetInfo > SAL_CALL
+        getPropertySetInfo() override;
+
+    // ____ XCloneable ____
+    virtual css::uno::Reference< css::util::XCloneable > SAL_CALL createClone() override;
+
+    // ____ XModifyBroadcaster ____
+    virtual void SAL_CALL addModifyListener(
+        const css::uno::Reference< css::util::XModifyListener >& aListener ) override;
+    virtual void SAL_CALL removeModifyListener(
+        const css::uno::Reference< css::util::XModifyListener >& aListener ) override;
+
+    // ____ XModifyListener ____
+    virtual void SAL_CALL modified(
+        const css::lang::EventObject& aEvent ) override;
+
+    // ____ XEventListener (base of XModifyListener) ____
+    virtual void SAL_CALL disposing(
+        const css::lang::EventObject& Source ) override;
+
+    // ____ OPropertySet ____
+    virtual void firePropertyChangeEvent() override;
+    using OPropertySet::disposing;
+
+private:
+
+    css::uno::Reference< css::util::XModifyListener > m_xModifyEventForwarder;
+};
+
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_MODEL_MAIN_WALL_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */