1 files changed, 94 insertions, 0 deletions
diff --git a/include/svl/sharedstringpool.hxx b/include/svl/sharedstringpool.hxx
new file mode 100644
index 000000000000..6793162059f8
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+++ b/include/svl/sharedstringpool.hxx
@@ -0,0 +1,94 @@
+/* -*- 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/.
+ */
+
+#ifndef SVL_STRINGPOOL_HXX
+#define SVL_STRINGPOOL_HXX
+
+#include "svl/svldllapi.h"
+#include "rtl/ustring.hxx"
+
+#include <boost/unordered_map.hpp>
+#include <boost/unordered_set.hpp>
+
+class CharClass;
+
+namespace svl {
+
+/**
+ * Storage for pool of shared strings.  It also provides mapping from
+ * original-cased strings to upper-cased strings for case insensitive
+ * operations.
+ */
+class SVL_DLLPUBLIC SharedStringPool
+{
+    typedef boost::unordered_set<OUString, OUStringHash> StrHashType;
+    typedef std::pair<StrHashType::iterator, bool> InsertResultType;
+    typedef boost::unordered_map<const rtl_uString*, OUString> StrIdMapType;
+
+    StrHashType maStrPool;
+    StrHashType maStrPoolUpper;
+    StrIdMapType maToUpperMap;
+    const CharClass* mpCharClass;
+
+public:
+
+    SharedStringPool();
+    SharedStringPool( const CharClass* pCharClass );
+
+    /**
+     * Intern a string object into the shared string pool.
+     *
+     * @param rStr string object to intern.
+     *
+     * @return a pointer to the string object stored inside the pool, or NULL
+     *         if the insertion fails.
+     */
+    rtl_uString* intern( const OUString& rStr );
+
+    /**
+     * Get a unique ID of string object that's expected to be in the shared
+     * string pool. If the string is not in the pool, NULL is returned.  The
+     * ID obtained by this method can be used for case sensitive comparison.
+     *
+     * @param rStr string object to get the ID of.
+     *
+     * @return unique ID of the string object.
+     */
+    sal_uIntPtr getIdentifier( const OUString& rStr ) const;
+
+    /**
+     * Get a unique ID of string object for case insensitive comparison. The
+     * string object is expected to be in the pool.
+     *
+     * @param rStr string object to get the ID of.
+     *
+     * @return unique ID of the string object usable for case insensitive
+     *         comparison.
+     */
+    sal_uIntPtr getIdentifierIgnoreCase( const OUString& rStr ) const;
+
+    /**
+     * Go through all string objects in the pool, and clear those that are no
+     * longer used outside of the pool.
+     */
+    void purge();
+
+    size_t getCount() const;
+
+    size_t getCountIgnoreCase() const;
+
+private:
+    InsertResultType findOrInsert( StrHashType& rPool, const OUString& rStr ) const;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */