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diff --git a/chart2/source/inc/InternalData.hxx b/chart2/source/inc/InternalData.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 <com/sun/star/uno/Sequence.hxx>
+
+#include <vector>
+#include <valarray>
+
+namespace chart
+{
+
+class InternalData
+{
+public:
+    InternalData();
+
+    void createDefaultData();
+
+    void setData( const css::uno::Sequence< css::uno::Sequence< double > > & rDataInRows );
+    css::uno::Sequence< css::uno::Sequence< double > > getData() const;
+
+    css::uno::Sequence< double > getColumnValues( sal_Int32 nColumnIndex ) const;
+    css::uno::Sequence< double > getRowValues( sal_Int32 nRowIndex ) const;
+
+    void setColumnValues( sal_Int32 nColumnIndex, const std::vector< double > & rNewData );
+    void setRowValues( sal_Int32 nRowIndex, const std::vector< double > & rNewData );
+
+    void setComplexColumnLabel( sal_Int32 nColumnIndex, std::vector< css::uno::Any >&& rComplexLabel );
+    void setComplexRowLabel( sal_Int32 nRowIndex, std::vector< css::uno::Any >&& rComplexLabel );
+
+    std::vector< css::uno::Any > getComplexColumnLabel( sal_Int32 nColumnIndex ) const;
+    std::vector< css::uno::Any > getComplexRowLabel( sal_Int32 nRowIndex ) const;
+
+    void swapRowWithNext( sal_Int32 nRowIndex );
+    void swapColumnWithNext( sal_Int32 nColumnIndex );
+
+    void insertColumn( sal_Int32 nAfterIndex );
+    void insertRow( sal_Int32 nAfterIndex );
+    void deleteColumn( sal_Int32 nAtIndex );
+    void deleteRow( sal_Int32 nAtIndex );
+
+    /// @return the index of the newly appended column
+    sal_Int32 appendColumn();
+    /// @return the index of the newly appended row
+    sal_Int32 appendRow();
+
+    sal_Int32 getRowCount() const;
+    sal_Int32 getColumnCount() const;
+
+    typedef std::vector< std::vector< css::uno::Any > > tVecVecAny; //inner index is hierarchical level
+
+    void setComplexRowLabels( tVecVecAny&& rNewRowLabels );
+    const tVecVecAny& getComplexRowLabels() const;
+    void setComplexColumnLabels( tVecVecAny&& rNewColumnLabels );
+    const tVecVecAny& getComplexColumnLabels() const;
+
+    void dump() const;
+
+private: //methods
+    /** resizes the data if at least one of the given dimensions is larger than
+        before.  The data is never becoming smaller only larger.
+
+        @return </true>, if the data was enlarged
+    */
+    bool enlargeData( sal_Int32 nColumnCount, sal_Int32 nRowCount );
+
+private:
+    sal_Int32   m_nColumnCount;
+    sal_Int32   m_nRowCount;
+
+    typedef std::valarray< double > tDataType;
+    tDataType    m_aData;
+    tVecVecAny   m_aRowLabels;//outer index is row index, inner index is category level
+    tVecVecAny   m_aColumnLabels;//outer index is column index
+};
+
+} //  namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */