DStringPool.cpp
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上传日期:2007-01-10
资源大小:6948k
文件大小:8k
源码类别:
xml/soap/webservice
开发平台:
C/C++
- /*
- * 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/>.
- */
- /*
- * $Log: DStringPool.cpp,v $
- * Revision 1.6 2001/10/25 21:47:14 peiyongz
- * Replace XMLDeleterFor with XMLRegisterCleanup
- *
- * Revision 1.5 2000/06/02 00:45:42 andyh
- * DOM Fixes: DOMString::rawBuffer() now returns a const XMLCh * pointer.
- * Two plain deletes changed to array deletes.
- *
- * Revision 1.4 2000/05/09 00:22:31 andyh
- * Memory Cleanup. XMLPlatformUtils::Terminate() deletes all lazily
- * allocated memory; memory leak checking tools will no longer report
- * that leaks exist. (DOM GetElementsByTagID temporarily removed
- * as part of this.)
- *
- * Revision 1.3 2000/03/02 19:53:58 roddey
- * This checkin includes many changes done while waiting for the
- * 1.1.0 code to be finished. I can't list them all here, but a list is
- * available elsewhere.
- *
- * Revision 1.2 2000/02/06 07:47:31 rahulj
- * Year 2K copyright swat.
- *
- * Revision 1.1.1.1 1999/11/09 01:09:05 twl
- * Initial checkin
- *
- * Revision 1.2 1999/11/08 20:44:23 rahul
- * Swat for adding in Product name and CVS comment log variable.
- *
- */
- //
- // file DStringPool.cpp
- //
- #include "DStringPool.hpp"
- #include <util/XMLRegisterCleanup.hpp>
- #include <util/XMLString.hpp>
- #include <util/PlatformUtils.hpp>
- //
- // DStringPoolEntry - one of these structs is allocated for each
- // DOMString in the pool. Each slot in the
- // hash table array itself is a pointer to the head
- // of a singly-linked list of these structs.
- //
- struct DStringPoolEntry
- {
- DStringPoolEntry *fNext;
- DOMString fString;
- };
- DStringPool::DStringPool(int hashTableSize)
- {
- fHashTableSize = hashTableSize;
- fHashTable = new DStringPoolEntry *[hashTableSize];
- for (int i=0; i<fHashTableSize; i++)
- fHashTable[i] = 0;
- };
- // Destructor. Iterate through the pool, deleting each of the
- // DSTringPoolEntry structs, then delete the hash
- // array itself.
- //
- DStringPool::~DStringPool()
- {
- for (int slot=0; slot<fHashTableSize; slot++)
- {
- DStringPoolEntry *spe;
- DStringPoolEntry *nextSPE;
- for (spe=fHashTable[slot]; spe != 0; spe = nextSPE )
- {
- // spe->string = 0;
- nextSPE = spe->fNext;
- delete spe; // Note that this will invoke the destructor
- // on spe->fString.
- }
- }
- delete [] fHashTable;
- fHashTable = 0;
- };
- const DOMString &DStringPool::getPooledString(const XMLCh *in)
- {
- DStringPoolEntry **pspe;
- DStringPoolEntry *spe;
- int inHash = XMLString::hash(in, fHashTableSize);
- pspe = &fHashTable[inHash];
- while (*pspe != 0)
- {
- if ((*pspe)->fString.equals(in))
- return (*pspe)->fString;
- pspe = &((*pspe)->fNext);
- }
- *pspe = spe = new DStringPoolEntry;
- spe->fNext = 0;
- spe->fString = DOMString(in);
- return spe->fString;
- };
- const DOMString &DStringPool::getPooledString(const DOMString &in)
- {
- DStringPoolEntry **pspe;
- DStringPoolEntry *spe;
- const XMLCh *inCharData = in.rawBuffer();
- int inLength = in.length();
- int inHash = XMLString::hashN(inCharData, inLength, fHashTableSize);
- pspe = &fHashTable[inHash];
- while (*pspe != 0)
- {
- if ((*pspe)->fString.equals(in))
- return (*pspe)->fString;
- pspe = &((*pspe)->fNext);
- }
- *pspe = spe = new DStringPoolEntry;
- spe->fNext = 0;
- spe->fString = DOMString(in);
- return spe->fString;
- };
- //
- // getLiteralString
- //
- // This is a static function that is somewhat separate from the rest
- // of the string pool. It is used to manage the one-time creation of
- // static strings that are reused freqently within the DOM implementation.
- // This is primarily things like the default names for the various
- // node types ("#text" and the like).
- //
- const DOMString &DStringPool::getStaticString(const char *in
- , DOMString **loc
- , XMLRegisterCleanup::XMLCleanupFn fn
- , XMLRegisterCleanup &clnObj)
- {
- if (*loc == 0)
- {
- DOMString *t = new DOMString(in); // This is one of the very few
- // places that a DOMString variable
- // is heap allocated. Normal usage
- // is to create local instances and
- // pass them around by value.
- if (XMLPlatformUtils::compareAndSwap((void **)loc, t, 0) != 0)
- delete t;
- else
- {
- // Register this string for deletion. Doing each string individually
- // may be a little heavyweight, but will work for the time being
- // for arranging the deletion of eveything on Termination of XML.
- clnObj.registerCleanup(fn);
- }
- }
- return **loc;
- }