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diff --git a/linguistic/source/convdic.hxx b/linguistic/source/convdic.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_LINGUISTIC_SOURCE_CONVDIC_HXX
+#define INCLUDED_LINGUISTIC_SOURCE_CONVDIC_HXX
+
+#include <com/sun/star/linguistic2/XConversionDictionary.hpp>
+#include <com/sun/star/linguistic2/XConversionPropertyType.hpp>
+#include <com/sun/star/util/XFlushable.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/interfacecontainer3.hxx>
+#include <i18nlangtag/lang.h>
+
+#include <memory>
+#include <unordered_map>
+
+// text conversion dictionary extension
+inline constexpr OUStringLiteral CONV_DIC_EXT = u"tcd";
+#define CONV_DIC_DOT_EXT        ".tcd"
+
+inline constexpr OUStringLiteral SN_CONV_DICTIONARY = u"com.sun.star.linguistic2.ConversionDictionary";
+
+
+bool    IsConvDic( const OUString &rFileURL, LanguageType &nLang, sal_Int16 &nConvType );
+
+typedef std::unordered_multimap<OUString, OUString> ConvMap;
+typedef std::unordered_multimap<OUString, sal_Int16> PropTypeMap;
+
+class ConvDic :
+    public ::cppu::WeakImplHelper
+    <
+        css::linguistic2::XConversionDictionary,
+        css::linguistic2::XConversionPropertyType,
+        css::util::XFlushable,
+        css::lang::XServiceInfo
+    >
+{
+    friend class ConvDicXMLExport;
+
+protected:
+
+    ::comphelper::OInterfaceContainerHelper3<css::util::XFlushListener> aFlushListeners;
+
+    ConvMap                         aFromLeft;
+    std::unique_ptr< ConvMap >        pFromRight;     // only available for bidirectional conversion dictionaries
+
+    std::unique_ptr< PropTypeMap >    pConvPropType;
+
+    OUString        aMainURL;   // URL to file
+    OUString        aName;
+    LanguageType    nLanguage;
+    sal_Int16       nConversionType;
+    sal_Int16       nMaxLeftCharCount;
+    sal_Int16       nMaxRightCharCount;
+    bool            bMaxCharCountIsValid;
+    bool            bNeedEntries;
+    bool            bIsModified;
+    bool            bIsActive;
+
+    // disallow copy-constructor and assignment-operator for now
+    ConvDic(const ConvDic &);
+    ConvDic & operator = (const ConvDic &);
+
+    static ConvMap::iterator GetEntry( ConvMap &rMap, const OUString &rFirstText, std::u16string_view rSecondText );
+    void    Load();
+    void    Save();
+
+public:
+    ConvDic( OUString aName,
+             LanguageType nLanguage,
+             sal_Int16 nConversionType,
+             bool bBiDirectional,
+             const OUString &rMainURL);
+    virtual ~ConvDic() override;
+
+    // XConversionDictionary
+    virtual OUString SAL_CALL getName(  ) override;
+    virtual css::lang::Locale SAL_CALL getLocale(  ) override;
+    virtual sal_Int16 SAL_CALL getConversionType(  ) override;
+    virtual void SAL_CALL setActive( sal_Bool bActivate ) override;
+    virtual sal_Bool SAL_CALL isActive(  ) override;
+    virtual void SAL_CALL clear(  ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getConversions( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength, css::linguistic2::ConversionDirection eDirection, sal_Int32 nTextConversionOptions ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getConversionEntries( css::linguistic2::ConversionDirection eDirection ) override;
+    virtual void SAL_CALL addEntry( const OUString& aLeftText, const OUString& aRightText ) override;
+    virtual void SAL_CALL removeEntry( const OUString& aLeftText, const OUString& aRightText ) override;
+    virtual sal_Int16 SAL_CALL getMaxCharCount( css::linguistic2::ConversionDirection eDirection ) override;
+
+    // XConversionPropertyType
+    virtual void SAL_CALL setPropertyType( const OUString& aLeftText, const OUString& aRightText, ::sal_Int16 nPropertyType ) override;
+    virtual ::sal_Int16 SAL_CALL getPropertyType( const OUString& aLeftText, const OUString& aRightText ) override;
+
+    // XFlushable
+    virtual void SAL_CALL flush(  ) override;
+    virtual void SAL_CALL addFlushListener( const css::uno::Reference< css::util::XFlushListener >& l ) override;
+    virtual void SAL_CALL removeFlushListener( const css::uno::Reference< css::util::XFlushListener >& l ) override;
+
+    // XServiceInfo
+    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;
+
+    bool    HasEntry( const OUString &rLeftText, std::u16string_view rRightText );
+    void    AddEntry( const OUString &rLeftText, const OUString &rRightText );
+    void    RemoveEntry( const OUString &rLeftText, const OUString &rRightText );
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */