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diff --git a/chart2/source/inc/CachedDataSequence.hxx b/chart2/source/inc/CachedDataSequence.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
+
+// helper classes
+#include <cppuhelper/compbase.hxx>
+#include <comphelper/uno3.hxx>
+#include <comphelper/broadcasthelper.hxx>
+#include <comphelper/propertycontainer.hxx>
+#include <comphelper/proparrhlp.hxx>
+
+// interfaces and types
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/chart2/data/XDataSequence.hpp>
+#include <com/sun/star/chart2/data/XNumericalDataSequence.hpp>
+#include <com/sun/star/chart2/data/XTextualDataSequence.hpp>
+#include <com/sun/star/util/XCloneable.hpp>
+#include "ModifyListenerHelper.hxx"
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace chart
+{
+
+namespace impl
+{
+typedef ::cppu::WeakComponentImplHelper<
+    css::chart2::data::XDataSequence,
+    css::chart2::data::XNumericalDataSequence,
+    css::chart2::data::XTextualDataSequence,
+    css::util::XCloneable,
+    css::util::XModifyBroadcaster,
+    css::lang::XInitialization,
+    css::lang::XServiceInfo >
+    CachedDataSequence_Base;
+}
+
+/**
+ * This sequence object does store actual values within, hence "cached".
+ */
+class CachedDataSequence final :
+        public ::comphelper::OMutexAndBroadcastHelper,
+        public ::comphelper::OPropertyContainer,
+        public ::comphelper::OPropertyArrayUsageHelper< CachedDataSequence >,
+        public impl::CachedDataSequence_Base
+{
+public:
+    /** constructs an empty sequence
+     */
+    CachedDataSequence();
+
+    explicit CachedDataSequence( const css::uno::Reference< css::uno::XComponentContext > & xContext );
+
+    /** creates a sequence and initializes it with the given string.  This is
+        especially useful for labels, which only have one element.
+     */
+    explicit CachedDataSequence( const OUString & rSingleText );
+
+    /// Copy CTOR
+    explicit CachedDataSequence( const CachedDataSequence & rSource );
+
+    virtual ~CachedDataSequence() override;
+
+    /// declare XServiceInfo methods
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    /// merge XInterface implementations
+    DECLARE_XINTERFACE()
+    /// merge XTypeProvider implementations
+    DECLARE_XTYPEPROVIDER()
+
+private:
+    // ____ XPropertySet ____
+    /// @see css::beans::XPropertySet
+    virtual css::uno::Reference< css::beans::XPropertySetInfo > SAL_CALL getPropertySetInfo() override;
+    /// @see ::comphelper::OPropertySetHelper
+    virtual ::cppu::IPropertyArrayHelper& SAL_CALL getInfoHelper() override;
+    /// @see ::comphelper::OPropertyArrayUsageHelper
+    virtual ::cppu::IPropertyArrayHelper* createArrayHelper() const override;
+
+    // ____ XDataSequence ____
+    virtual css::uno::Sequence< css::uno::Any > SAL_CALL getData() override;
+    virtual OUString SAL_CALL getSourceRangeRepresentation() override;
+    virtual css::uno::Sequence< OUString > SAL_CALL generateLabel(
+        css::chart2::data::LabelOrigin nLabelOrigin ) override;
+    virtual ::sal_Int32 SAL_CALL getNumberFormatKeyByIndex( ::sal_Int32 nIndex ) override;
+
+    // ____ XNumericalDataSequence ____
+    /// @see css::chart::data::XNumericalDataSequence
+    virtual css::uno::Sequence< double > SAL_CALL getNumericalData() override;
+
+    // ____ XTextualDataSequence ____
+    /// @see css::chart::data::XTextualDataSequence
+    virtual css::uno::Sequence< OUString > SAL_CALL getTextualData() 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;
+
+    // css::lang::XInitialization:
+    virtual void SAL_CALL initialize(const css::uno::Sequence< css::uno::Any > & aArguments) override;
+
+    // <properties>
+    sal_Int32                                       m_nNumberFormatKey;
+    OUString                                 m_sRole;
+    // </properties>
+
+    enum DataType
+    {
+        NUMERICAL,
+        TEXTUAL,
+        MIXED
+    };
+
+    /** This method registers all properties.  It should be called by all
+        constructors.
+     */
+    void registerProperties();
+
+    /** is used by interface method getNumericalData().
+     */
+    css::uno::Sequence< double > Impl_getNumericalData() const;
+    /** is used by interface method getTextualData().
+     */
+    css::uno::Sequence< OUString > Impl_getTextualData() const;
+    /** is used by interface method getData().
+     */
+    css::uno::Sequence< css::uno::Any > Impl_getMixedData() const;
+
+    enum DataType                                          m_eCurrentDataType;
+
+    css::uno::Sequence< double >                           m_aNumericalSequence;
+    css::uno::Sequence< OUString >                         m_aTextualSequence;
+    css::uno::Sequence< css::uno::Any >                    m_aMixedSequence;
+    rtl::Reference<ModifyEventForwarder> m_xModifyEventForwarder;
+};
+
+}  // namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */