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diff --git a/i18npool/inc/xdictionary.hxx b/i18npool/inc/xdictionary.hxx
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+++ b/i18npool/inc/xdictionary.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 <osl/file.h>
+#include <sal/types.h>
+
+#include <com/sun/star/i18n/Boundary.hpp>
+
+namespace i18npool {
+
+#define CACHE_MAX 32        // max cache structure number
+#define DEFAULT_SIZE 256    // for boundary size, to avoid alloc and release memory
+
+// cache structure.
+struct WordBreakCache {
+    sal_Unicode *contents;      // separated segment contents.
+    sal_Int32* wordboundary;        // word boundaries in segments.
+    sal_Int32 length;       // contents length saved here.
+    sal_Int32 size;         // size of wordboundary
+
+    WordBreakCache();
+    bool equals(const sal_Unicode *str, css::i18n::Boundary const & boundary) const;    // checking cached string
+};
+
+struct xdictionarydata
+{
+    const sal_uInt8  * existMark;
+    const sal_Int16  * index1;
+    const sal_Int32  * index2;
+    const sal_Int32  * lenArray;
+    const sal_Unicode* dataArea;
+    xdictionarydata() :
+        existMark( nullptr ),
+        index1( nullptr ),
+        index2( nullptr ),
+        lenArray( nullptr ),
+        dataArea( nullptr )
+    {
+    }
+};
+
+class xdictionary
+{
+private:
+    xdictionarydata data;
+    void initDictionaryData(const char *lang);
+
+    css::i18n::Boundary boundary;
+    bool japaneseWordBreak;
+#ifdef DICT_JA_ZH_IN_DATAFILE
+    oslFileHandle m_aFileHandle;
+    sal_uInt64 m_nFileSize;
+    char* m_pMapping;
+#endif
+
+public:
+    xdictionary(const char *lang);
+    ~xdictionary();
+    css::i18n::Boundary nextWord( const OUString& rText, sal_Int32 nPos, sal_Int16 wordType);
+    css::i18n::Boundary previousWord( const OUString& rText, sal_Int32 nPos, sal_Int16 wordType);
+    css::i18n::Boundary const & getWordBoundary( const OUString& rText, sal_Int32 nPos, sal_Int16 wordType, bool bDirection );
+    void setJapaneseWordBreak();
+
+private:
+    WordBreakCache cache[CACHE_MAX];
+    OUString segmentCachedString;
+    css::i18n::Boundary segmentCachedBoundary;
+
+    bool        seekSegment(const OUString& rText, sal_Int32 pos, css::i18n::Boundary& boundary);
+    WordBreakCache& getCache(const sal_Unicode *text, css::i18n::Boundary const & boundary);
+    bool        exists(const sal_uInt32 u) const;
+    sal_Int32   getLongestMatch(const sal_Unicode *text, sal_Int32 len) const;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */