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XalanDOMStringCache.hpp

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00001 /*
00002  * The Apache Software License, Version 1.1
00003  *
00004  *
00005  * Copyright (c) 1999-2004 The Apache Software Foundation.  All rights 
00006  * reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions
00010  * are met:
00011  *
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, this list of conditions and the following disclaimer. 
00014  *
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in
00017  *    the documentation and/or other materials provided with the
00018  *    distribution.
00019  *
00020  * 3. The end-user documentation included with the redistribution,
00021  *    if any, must include the following acknowledgment:  
00022  *       "This product includes software developed by the
00023  *        Apache Software Foundation (http://www.apache.org/)."
00024  *    Alternately, this acknowledgment may appear in the software itself,
00025  *    if and wherever such third-party acknowledgments normally appear.
00026  *
00027  * 4. The names "Xalan" and "Apache Software Foundation" must
00028  *    not be used to endorse or promote products derived from this
00029  *    software without prior written permission. For written 
00030  *    permission, please contact apache@apache.org.
00031  *
00032  * 5. Products derived from this software may not be called "Apache",
00033  *    nor may "Apache" appear in their name, without prior written
00034  *    permission of the Apache Software Foundation.
00035  *
00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
00043  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00044  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00045  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00047  * SUCH DAMAGE.
00048  * ====================================================================
00049  *
00050  * This software consists of voluntary contributions made by many
00051  * individuals on behalf of the Apache Software Foundation and was
00052  * originally based on software copyright (c) 1999, International
00053  * Business Machines, Inc., http://www.ibm.com.  For more
00054  * information on the Apache Software Foundation, please see
00055  * <http://www.apache.org/>.
00056  */
00057 #if !defined(XALAN_DOMSTRINGCACHE_HEADER_GUARD)
00058 #define XALAN_DOMSTRINGCACHE_HEADER_GUARD
00059 
00060 
00061 
00062 // Base include file.  Must be first.
00063 #include <xalanc/PlatformSupport/PlatformSupportDefinitions.hpp>
00064 
00065 
00066 
00067 #include <deque>
00068 #include <vector>
00069 
00070 
00071 
00072 #include <xalanc/XalanDOM/XalanDOMString.hpp>
00073 
00074 
00075 
00076 XALAN_CPP_NAMESPACE_BEGIN
00077 
00078 
00079 
00080 class XALAN_PLATFORMSUPPORT_EXPORT XalanDOMStringCache
00081 {
00082 public:
00083 
00084     enum { eDefaultMaximumSize = 100 };
00085 
00086 #if defined(XALAN_NO_STD_NAMESPACE)
00087     typedef vector<XalanDOMString*>         StringListType;
00088 #else
00089     typedef std::vector<XalanDOMString*>    StringListType;
00090 #endif
00091 
00092     explicit
00093     XalanDOMStringCache(unsigned int    theMaximumSize = eDefaultMaximumSize);
00094 
00095     ~XalanDOMStringCache();
00096 
00097     unsigned int
00098     getMaximumSize() const
00099     {
00100         return m_maximumSize;
00101     }
00102 
00103     void
00104     setMaximumSize(unsigned int     theSize)
00105     {
00106         m_maximumSize = theSize;
00107     }
00108 
00109     XalanDOMString&
00110     get();
00111 
00112     bool
00113     release(XalanDOMString&     theString);
00114 
00115     /*
00116      * Clear all of the strings in the cache.  This
00117      * destroys all of the strings.
00118      *
00119      */
00120     void
00121     clear();
00122 
00123     /*
00124      * Reset the cache so that all strings that are
00125      * currently in use are available.
00126      */
00127     void
00128     reset();
00129 
00130     class GetAndRelease
00131     {
00132     public:
00133 
00134         GetAndRelease(XalanDOMStringCache&  theCache) :
00135             m_cache(theCache),
00136             m_string(&theCache.get())
00137         {
00138         }
00139 
00140         ~GetAndRelease()
00141         {
00142             m_cache.release(*m_string);
00143         }
00144 
00145         XalanDOMString&
00146         get() const
00147         {
00148             return *m_string;
00149         }
00150 
00151     private:
00152 
00153         XalanDOMStringCache&    m_cache;
00154 
00155         XalanDOMString* const   m_string;
00156     };
00157 
00158 private:
00159 
00160     // not implemented
00161     XalanDOMStringCache(const XalanDOMStringCache&);
00162 
00163     bool
00164     operator==(const XalanDOMStringCache&) const;
00165 
00166     XalanDOMStringCache&
00167     operator=(const XalanDOMStringCache&);
00168 
00172     StringListType  m_availableList;
00173 
00177     StringListType  m_busyList;
00178 
00179     unsigned int    m_maximumSize;
00180 };
00181 
00182 
00183 
00184 XALAN_CPP_NAMESPACE_END
00185 
00186 
00187 
00188 #endif  // XALAN_RESULTNAMESPACESSTACK_HEADER_GUARD

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Xalan-C++ XSLT Processor Version 1.7
Copyright © 1999-2004 The Apache Software Foundation. All Rights Reserved.