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diff --git a/chart2/source/inc/LegendHelper.hxx b/chart2/source/inc/LegendHelper.hxx
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+++ b/chart2/source/inc/LegendHelper.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_INC_LEGENDHELPER_HXX
+#define INCLUDED_CHART2_SOURCE_INC_LEGENDHELPER_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include "charttoolsdllapi.hxx"
+
+namespace chart { class ChartModel; }
+namespace com::sun::star::chart2 { class XDiagram; }
+namespace com::sun::star::chart2 { class XLegend; }
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace chart
+{
+
+class OOO_DLLPUBLIC_CHARTTOOLS LegendHelper
+{
+public:
+    static css::uno::Reference< css::chart2::XLegend >
+        showLegend( ChartModel& rModel
+                  , const css::uno::Reference< css::uno::XComponentContext >& xContext );
+
+    static  void hideLegend( ChartModel& rModel );
+
+    static css::uno::Reference< css::chart2::XLegend >
+        getLegend( ChartModel& rModel
+                 , const css::uno::Reference< css::uno::XComponentContext >& xContext = nullptr
+                 , bool bCreate = false );
+
+    /** returns <FALSE/>, if either there is no legend at the diagram, or there
+        is a legend which has a "Show" property of value <FALSE/>. Otherwise,
+        <TRUE/> is returned.
+     */
+    static bool hasLegend( const css::uno::Reference< css::chart2::XDiagram > & xDiagram );
+};
+
+} //namespace chart
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */