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diff --git a/chart2/source/inc/ExplicitCategoriesProvider.hxx b/chart2/source/inc/ExplicitCategoriesProvider.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_EXPLICITCATEGORIESPROVIDER_HXX
+#define INCLUDED_CHART2_SOURCE_INC_EXPLICITCATEGORIESPROVIDER_HXX
+
+#include "charttoolsdllapi.hxx"
+#include <cppuhelper/weakref.hxx>
+#include <com/sun/star/uno/Reference.h>
+#include <com/sun/star/uno/Sequence.h>
+
+#include <vector>
+
+namespace chart { class ChartModel; }
+namespace com::sun::star::chart2 { class XCoordinateSystem; }
+namespace com::sun::star::chart2::data { class XDataSequence; }
+namespace com::sun::star::chart2::data { class XLabeledDataSequence; }
+namespace com::sun::star::uno { class Any; }
+
+namespace chart
+{
+
+struct OOO_DLLPUBLIC_CHARTTOOLS ComplexCategory
+{
+    OUString Text;
+    sal_Int32 Count;
+
+    ComplexCategory( const OUString& rText, sal_Int32 nCount ) : Text( rText ), Count (nCount)
+    {}
+};
+
+class SplitCategoriesProvider
+{
+public:
+    virtual ~SplitCategoriesProvider();
+
+    virtual sal_Int32 getLevelCount() const = 0;
+    virtual css::uno::Sequence< OUString > getStringsForLevel( sal_Int32 nIndex ) const = 0;
+};
+
+class OOO_DLLPUBLIC_CHARTTOOLS ExplicitCategoriesProvider final
+{
+public:
+    ExplicitCategoriesProvider( const css::uno::Reference< css::chart2::XCoordinateSystem >& xCooSysModel
+                       , ChartModel& rChartModel
+                       );
+    ~ExplicitCategoriesProvider();
+
+    void init();
+
+    css::uno::Reference< css::chart2::data::XDataSequence > getOriginalCategories();
+
+    css::uno::Sequence< OUString > const & getSimpleCategories();
+    const std::vector<ComplexCategory>* getCategoriesByLevel( sal_Int32 nLevel );
+
+    static OUString getCategoryByIndex(
+          const css::uno::Reference< css::chart2::XCoordinateSystem >& xCooSysModel
+        , ChartModel& rModel
+        , sal_Int32 nIndex );
+
+    static css::uno::Sequence< OUString > getExplicitSimpleCategories(
+            const SplitCategoriesProvider& rSplitCategoriesProvider );
+
+    static void convertCategoryAnysToText( css::uno::Sequence< OUString >& rOutTexts
+        , const css::uno::Sequence< css::uno::Any >& rInAnys
+        , ChartModel& rModel );
+
+    bool hasComplexCategories() const;
+    sal_Int32 getCategoryLevelCount() const;
+
+    const css::uno::Sequence< css::uno::Reference<
+        css::chart2::data::XLabeledDataSequence> >& getSplitCategoriesList() const { return m_aSplitCategoriesList;}
+
+    bool isDateAxis();
+    const std::vector< double >&  getDateCategories();
+
+private:
+    ExplicitCategoriesProvider(ExplicitCategoriesProvider const &) = delete;
+    ExplicitCategoriesProvider& operator =(ExplicitCategoriesProvider const &) = delete;
+
+    bool volatile m_bDirty;
+    css::uno::WeakReference< css::chart2::XCoordinateSystem >   m_xCooSysModel;
+    ChartModel& mrModel;
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence> m_xOriginalCategories;
+
+    bool m_bIsExplicitCategoriesInited;
+    css::uno::Sequence< OUString >  m_aExplicitCategories;
+    std::vector< std::vector< ComplexCategory > >   m_aComplexCats;
+    css::uno::Sequence< css::uno::Reference<
+        css::chart2::data::XLabeledDataSequence> > m_aSplitCategoriesList;
+
+    bool m_bIsDateAxis;
+    bool m_bIsAutoDate;
+    std::vector< double >  m_aDateCategories;
+};
+
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_INC_EXPLICITCATEGORIESPROVIDER_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */