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diff --git a/chart2/source/inc/OPropertySet.hxx b/chart2/source/inc/OPropertySet.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_OPROPERTYSET_HXX
+#define INCLUDED_CHART2_SOURCE_INC_OPROPERTYSET_HXX
+
+// helper classes
+#include <cppuhelper/propshlp.hxx>
+
+// interfaces and types
+#include <com/sun/star/lang/XTypeProvider.hpp>
+#include <com/sun/star/beans/XPropertyState.hpp>
+#include <com/sun/star/beans/XMultiPropertyStates.hpp>
+#include <com/sun/star/style/XStyleSupplier.hpp>
+#include "charttoolsdllapi.hxx"
+
+#include <memory>
+
+namespace property
+{
+
+namespace impl
+{ class ImplOPropertySet; }
+
+class OPropertySet :
+    public ::cppu::OBroadcastHelper,
+    // includes beans::XPropertySet, XMultiPropertySet and XFastPropertySet
+    public ::cppu::OPropertySetHelper,
+    // includes uno::XWeak (and XInterface, esp. ref-counting)
+
+    public css::lang::XTypeProvider,
+    public css::beans::XPropertyState,
+    public css::beans::XMultiPropertyStates,
+    public css::style::XStyleSupplier
+{
+public:
+    OPropertySet( ::osl::Mutex & rMutex );
+    virtual ~OPropertySet();
+
+protected:
+    explicit OPropertySet( const OPropertySet & rOther, ::osl::Mutex & rMutex );
+
+    void SetNewValuesExplicitlyEvenIfTheyEqualDefault();
+
+    /** implement this method to provide default values for all properties
+        supporting defaults.  If a property does not have a default value, you
+        may throw an UnknownPropertyException.
+
+        @throws css::beans::UnknownPropertyException
+        @throws css::uno::RuntimeException
+     */
+    virtual css::uno::Any GetDefaultValue( sal_Int32 nHandle ) const = 0;
+
+    /** The InfoHelper table contains all property names and types of
+        this object.
+
+        @return the object that provides information for the
+                PropertySetInfo
+
+        @see ::cppu::OPropertySetHelper
+     */
+    virtual ::cppu::IPropertyArrayHelper & SAL_CALL getInfoHelper() override = 0;
+
+    /** Try to convert the value <code>rValue</code> to the type required by the
+        property associated with <code>nHandle</code>.
+
+        Override this method to take influence in modification of properties.
+
+        If the conversion changed , </sal_True> is returned and the converted value
+        is in <code>rConvertedValue</code>.  The former value is contained in
+        <code>rOldValue</code>.
+
+        After this call returns successfully, the vetoable listeners are
+        notified.
+
+        @throws IllegalArgumentException, if the conversion was not successful,
+                or if there is no corresponding property to the given handle.
+
+        @param rConvertedValue the converted value. Only set if return is true.
+        @param rOldValue the old value. Only set if return is true.
+        @param nHandle the handle of the property.
+
+        @return true, if the conversion was successful and converted value
+                differs from the old value.
+
+        @see ::cppu::OPropertySetHelper
+     */
+    virtual sal_Bool SAL_CALL convertFastPropertyValue
+        ( css::uno::Any & rConvertedValue,
+          css::uno::Any & rOldValue,
+          sal_Int32 nHandle,
+          const css::uno::Any& rValue ) override;
+
+    /** The same as setFastPropertyValue; nHandle is always valid.
+        The changes must not be broadcasted in this method.
+
+        @attention
+        Although you are permitted to throw any UNO exception, only the following
+        are valid for usage:
+        -- css::beans::UnknownPropertyException
+        -- css::beans::PropertyVetoException
+        -- css::lang::IllegalArgumentException
+        -- css::lang::WrappedTargetException
+        -- css::uno::RuntimeException
+
+        @param nHandle handle
+        @param rValue  value
+
+        @see ::cppu::OPropertySetHelper
+    */
+    virtual void SAL_CALL setFastPropertyValue_NoBroadcast
+        ( sal_Int32 nHandle,
+          const css::uno::Any& rValue ) override;
+
+    /**
+       The same as getFastPropertyValue, but return the value through rValue and
+       nHandle is always valid.
+
+        @see ::cppu::OPropertySetHelper
+     */
+    virtual void SAL_CALL getFastPropertyValue
+        ( css::uno::Any& rValue,
+          sal_Int32 nHandle ) const override;
+
+    /// make original interface function visible again
+    using ::com::sun::star::beans::XFastPropertySet::getFastPropertyValue;
+
+    /** implement this method in derived classes to get called when properties
+        change.
+     */
+    virtual void firePropertyChangeEvent();
+
+    // Interfaces
+
+    // ____ XInterface ____
+    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type& aType ) override;
+
+    // ____ XTypeProvider ____
+    virtual css::uno::Sequence< css::uno::Type > SAL_CALL
+        getTypes() override;
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL
+        getImplementationId() override;
+
+    // ____ XPropertyState ____
+    virtual css::beans::PropertyState SAL_CALL
+        getPropertyState( const OUString& PropertyName ) override;
+    virtual css::uno::Sequence< css::beans::PropertyState > SAL_CALL
+        getPropertyStates( const css::uno::Sequence< OUString >& aPropertyName ) override;
+    virtual void SAL_CALL
+        setPropertyToDefault( const OUString& PropertyName ) override;
+    virtual css::uno::Any SAL_CALL
+        getPropertyDefault( const OUString& aPropertyName ) override;
+
+    // ____ XMultiPropertyStates ____
+    // Note: getPropertyStates() is already implemented in XPropertyState with the
+    // same signature
+    virtual void SAL_CALL
+        setAllPropertiesToDefault() override;
+    virtual void SAL_CALL
+        setPropertiesToDefault( const css::uno::Sequence< OUString >& aPropertyNames ) override;
+    virtual css::uno::Sequence< css::uno::Any > SAL_CALL
+        getPropertyDefaults( const css::uno::Sequence< OUString >& aPropertyNames ) override;
+
+    // ____ XStyleSupplier ____
+    virtual css::uno::Reference< css::style::XStyle > SAL_CALL getStyle() override;
+    virtual void SAL_CALL setStyle( const css::uno::Reference< css::style::XStyle >& xStyle ) override;
+
+    // ____ XMultiPropertySet ____
+    virtual void SAL_CALL setPropertyValues(
+        const css::uno::Sequence< OUString >& PropertyNames,
+        const css::uno::Sequence< css::uno::Any >& Values ) override;
+
+    // ____ XFastPropertySet ____
+    virtual void SAL_CALL setFastPropertyValue( sal_Int32 nHandle, const css::uno::Any& rValue ) override;
+
+    // Note: it is assumed that the base class implements setPropertyValue by
+    // using setFastPropertyValue
+
+private:
+    /// reference to mutex of class deriving from here
+    ::osl::Mutex &   m_rMutex;
+
+    /// pImpl idiom implementation
+    std::unique_ptr< impl::ImplOPropertySet > m_pImplProperties;
+    bool m_bSetNewValuesExplicitlyEvenIfTheyEqualDefault;
+};
+
+} //  namespace property
+
+// INCLUDED_CHART2_SOURCE_INC_OPROPERTYSET_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */