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DOMStringImpl.hpp

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00001 #ifndef DOMStringImpl_HEADER_GUARD_
00002 #define DOMStringImpl_HEADER_GUARD_
00003 
00004 /*
00005  * The Apache Software License, Version 1.1
00006  * 
00007  * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights
00008  * reserved.
00009  * 
00010  * Redistribution and use in source and binary forms, with or without
00011  * modification, are permitted provided that the following conditions
00012  * are met:
00013  * 
00014  * 1. Redistributions of source code must retain the above copyright
00015  *    notice, this list of conditions and the following disclaimer. 
00016  * 
00017  * 2. Redistributions in binary form must reproduce the above copyright
00018  *    notice, this list of conditions and the following disclaimer in
00019  *    the documentation and/or other materials provided with the
00020  *    distribution.
00021  * 
00022  * 3. The end-user documentation included with the redistribution,
00023  *    if any, must include the following acknowledgment:  
00024  *       "This product includes software developed by the
00025  *        Apache Software Foundation (http://www.apache.org/)."
00026  *    Alternately, this acknowledgment may appear in the software itself,
00027  *    if and wherever such third-party acknowledgments normally appear.
00028  * 
00029  * 4. The names "Xerces" and "Apache Software Foundation" must
00030  *    not be used to endorse or promote products derived from this
00031  *    software without prior written permission. For written 
00032  *    permission, please contact apache\@apache.org.
00033  * 
00034  * 5. Products derived from this software may not be called "Apache",
00035  *    nor may "Apache" appear in their name, without prior written
00036  *    permission of the Apache Software Foundation.
00037  * 
00038  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00039  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00040  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00041  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00042  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00043  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00044  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
00045  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00046  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00047  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
00048  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00049  * SUCH DAMAGE.
00050  * ====================================================================
00051  * 
00052  * This software consists of voluntary contributions made by many
00053  * individuals on behalf of the Apache Software Foundation, and was
00054  * originally based on software copyright (c) 1999, International
00055  * Business Machines, Inc., http://www.ibm.com .  For more information
00056  * on the Apache Software Foundation, please see
00057  * <http://www.apache.org/>.
00058  */
00059 
00060 /*
00061  * $Log: DOMStringImpl.hpp,v $
00062  * Revision 1.8  2000/05/09 00:22:30  andyh
00063  * Memory Cleanup.  XMLPlatformUtils::Terminate() deletes all lazily
00064  * allocated memory; memory leak checking tools will no longer report
00065  * that leaks exist.  (DOM GetElementsByTagID temporarily removed
00066  * as part of this.)
00067  *
00068  * Revision 1.7  2000/03/02 19:53:52  roddey
00069  * This checkin includes many changes done while waiting for the
00070  * 1.1.0 code to be finished. I can't list them all here, but a list is
00071  * available elsewhere.
00072  *
00073  * Revision 1.6  2000/02/24 20:11:27  abagchi
00074  * Swat for removing Log from API docs
00075  *
00076  * Revision 1.5  2000/02/06 07:47:27  rahulj
00077  * Year 2K copyright swat.
00078  *
00079  * Revision 1.4  2000/02/04 05:46:31  andyh
00080  * Change offsets and lengths form signed to unsigned
00081  *
00082  * Revision 1.3  2000/01/29 00:39:08  andyh
00083  * Redo synchronization in DOMStringHandle allocator.  There
00084  * was a bug in the use of Compare and Swap.  Switched to mutexes.
00085  *
00086  * Changed a few plain deletes to delete [].
00087  *
00088  * Revision 1.2  2000/01/12 19:55:14  aruna1
00089  * Included header for size_t
00090  *
00091  * Revision 1.1  2000/01/05 22:16:26  robweir
00092  * Move DOMString implementation class declarations into a new
00093  * file: DOMStringImpl.hpp.  Include this header in DOMString.hpp
00094  * for XML_DEBUG builds so the underlying character array will be
00095  * visible in the debugger.  <robert_weir@lotus.com>
00096  *
00097  *
00098  */
00099 
00100 
00101 //
00102 //  This file is part of the internal implementation of the C++ XML DOM.
00103 //  It should NOT be included or used directly by application programs.
00104 //
00105 
00106 
00107 #include <util/XercesDefs.hpp>
00108 #include <util/Mutexes.hpp>
00109 #include <stdio.h>
00110 
00111 
00112 class   DOMStringData
00113 {
00114 public:
00115     unsigned int        fBufferLength;
00116     int                 fRefCount;
00117     XMLCh               fData[1];
00118     
00119     static DOMStringData *allocateBuffer(unsigned int length);
00120     inline void         addRef();
00121     inline void         removeRef();
00122 };
00123 
00124 class  DOMStringHandle
00125 {
00126 public:
00127             unsigned int     fLength;              // The logical length of the DOMString.
00128                                                    //  This may be shorter than the buffer length.
00129             int              fRefCount;            // The number of DOMString objects pointing to
00130                                                    //  this string handle.
00131             DOMStringData    *fDSData;             // Pointer to the string buffer. May be null.
00132 
00133     void    *operator new( size_t sizeToAlloc);    // StringHandles have custom, optimized
00134     void    operator delete( void *pvMem );        //   memory allocation.
00135 
00136 
00137 private:
00138     static  void             *freeListPtr;         // Head of the linked list of unallocated String Handles
00139 
00140     static  DOMStringHandle  *blockListPtr;        // Head of the linked list of memory blocks from which
00141                                                    //  string handles are sub-allocated.
00142 
00143 public:
00144     static  DOMStringHandle  *createNewStringHandle(unsigned int bufLength);
00145             DOMStringHandle  *cloneStringHandle();
00146     inline  void             addRef();
00147     inline  void             removeRef();
00148                              ~DOMStringHandle() {};
00149     static  void             DOMStringCleanup();
00150 private:
00151     inline                   DOMStringHandle() {};
00152     static inline  XMLMutex &getMutex();
00153 };
00154 
00155 
00156 #endif
00157     


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