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DStringPool.hpp

/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */


//
// file DStringPool.hpp
//

//
//  This file is part of the internal implementation of the C++ XML DOM.
//  It should NOT be included or used directly by application programs.
//
//  Applications should include the file <dom/DOM.hpp> for the entire
//  DOM API, or DOM_*.hpp for individual DOM classes, where the class
//  name is substituded for the *.
//

#ifndef DStringPool_HEADER_GUARD_
#define DStringPool_HEADER_GUARD_

#include <xercesc/util/XercesDefs.hpp>
#include <xercesc/dom/DOMString.hpp>
#include <xercesc/util/XMLRegisterCleanup.hpp>

struct DStringPoolEntry;

//
// DStringPool is a hash table of DOMStrings.
//  Each DOM Document maintains a DStringPool containing a DOMString
//  for each Element tag name and Attribute Name that has been added
//  to the document.  When creating additional elements or attributes,
//  if the name has been seen before, the already existing string
//  will be reused.
//
class DStringPool
{
public:
    DStringPool(int  hashTableSize);  
    ~DStringPool();

    const DOMString &getPooledString(const DOMString &in);
    const DOMString &getPooledString(const XMLCh *in);

    static const DOMString &getStaticString(const char *in
                                          , DOMString **loc
                                          , XMLRegisterCleanup::XMLCleanupFn fn
                                          , XMLRegisterCleanup &clnObj);

private:
    DStringPool(const DStringPool &other);      // Copy constructor and assignment
    void operator = (const DStringPool &other); //  of DStringPool are not supported.

    DStringPoolEntry **fHashTable;
    int              fHashTableSize;
};

#endif

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