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diff --git a/linguistic/inc/iprcache.hxx b/linguistic/inc/iprcache.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_INC_IPRCACHE_HXX
+#define INCLUDED_LINGUISTIC_INC_IPRCACHE_HXX
+
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Reference.h>
+#include <com/sun/star/beans/XPropertyChangeListener.hpp>
+#include <com/sun/star/linguistic2/XDictionaryListEventListener.hpp>
+#include <com/sun/star/linguistic2/XSearchableDictionaryList.hpp>
+#include <com/sun/star/linguistic2/XLinguProperties.hpp>
+
+#include <rtl/ref.hxx>
+#include <i18nlangtag/lang.h>
+
+#include <set>
+#include <map>
+
+namespace linguistic
+{
+
+class SpellCache;
+
+class FlushListener final :
+    public cppu::WeakImplHelper
+    <
+        css::linguistic2::XDictionaryListEventListener,
+        css::beans::XPropertyChangeListener
+    >
+{
+    css::uno::Reference< css::linguistic2::XSearchableDictionaryList >    xDicList;
+    css::uno::Reference< css::linguistic2::XLinguProperties >             xPropSet;
+    SpellCache&                                                           mrSpellCache;
+
+    FlushListener(const FlushListener &) = delete;
+    FlushListener & operator = (const FlushListener &) = delete;
+
+public:
+    FlushListener( SpellCache& rFO ) : mrSpellCache(rFO) {}
+
+    void        SetDicList( css::uno::Reference< css::linguistic2::XSearchableDictionaryList > const &rDL );
+    void        SetPropSet( css::uno::Reference< css::linguistic2::XLinguProperties > const &rPS );
+
+    //XEventListener
+    virtual void SAL_CALL disposing( const css::lang::EventObject& rSource ) override;
+
+    // XDictionaryListEventListener
+    virtual void SAL_CALL processDictionaryListEvent( const css::linguistic2::DictionaryListEvent& rDicListEvent ) override;
+
+    // XPropertyChangeListener
+    virtual void SAL_CALL propertyChange( const css::beans::PropertyChangeEvent& rEvt ) override;
+};
+
+
+class SpellCache final
+{
+    rtl::Reference<FlushListener>  mxFlushLstnr;
+
+    typedef std::set< OUString >                  WordList_t;
+    typedef std::map< LanguageType, WordList_t >  LangWordList_t;
+    LangWordList_t  aWordLists;
+
+    SpellCache(const SpellCache &) = delete;
+    SpellCache & operator = (const SpellCache &) = delete;
+
+public:
+    SpellCache();
+    ~SpellCache();
+
+    // called from FlushListener
+    void    Flush();
+
+    void    AddWord( const OUString& rWord, LanguageType nLang );
+    bool    CheckWord( const OUString& rWord, LanguageType nLang );
+};
+
+
+}   // namespace linguistic
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */