DOMImplementationRegistry.cpp
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上传日期:2013-06-25
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Visual C++
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2002 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) 2002, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: DOMImplementationRegistry.cpp,v 1.3 2002/11/04 15:07:34 tng Exp $
- */
- #include <xercesc/util/PlatformUtils.hpp>
- #include <xercesc/util/RefVectorOf.hpp>
- #include <xercesc/util/XMLRegisterCleanup.hpp>
- #include <xercesc/dom/DOMImplementationRegistry.hpp>
- #include <xercesc/dom/DOMImplementationSource.hpp>
- #include <xercesc/dom/DOMImplementation.hpp>
- #include "DOMImplementationImpl.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- // -----------------------------------------------------------------------
- // Static constants. These are lazily initialized on first usage.
- // (Static constructors can not be safely used because
- // of order of initialization dependencies.)
- // -----------------------------------------------------------------------
- // Points to the singleton instance of a registry of DOMImplementationSource
- static RefVectorOf<DOMImplementationSource>* gDOMImplSrcVector;
- // Global mutex that is used to synchronize access to the vector
- static XMLMutex* gDOMImplSrcVectorMutex = 0;
- // -----------------------------------------------------------------------
- // Function prototypes for internally used functions.
- // -----------------------------------------------------------------------
- RefVectorOf<DOMImplementationSource>* getDOMImplSrcVector();
- XMLMutex& getDOMImplSrcVectorMutex();
- // -----------------------------------------------------------------------
- // Reset the static data
- // -----------------------------------------------------------------------
- static void reinitDOMImplSrcVector()
- {
- delete gDOMImplSrcVector;
- gDOMImplSrcVector = 0;
- }
- static void reinitDOMImplSrcVectorMutex()
- {
- delete gDOMImplSrcVectorMutex;
- gDOMImplSrcVectorMutex = 0;
- };
- // -----------------------------------------------------------------------
- // Get the static data
- // -----------------------------------------------------------------------
- RefVectorOf<DOMImplementationSource>* getDOMImplSrcVector()
- {
- static XMLRegisterCleanup cleanupDOMImplSrcVector;
- if (gDOMImplSrcVector == 0)
- {
- RefVectorOf<DOMImplementationSource> *t = new RefVectorOf<DOMImplementationSource>(3, false);
- if (XMLPlatformUtils::compareAndSwap((void **)&gDOMImplSrcVector, t, 0) != 0)
- {
- delete t;
- }
- else
- {
- cleanupDOMImplSrcVector.registerCleanup(reinitDOMImplSrcVector);
- }
- }
- return gDOMImplSrcVector;
- }
- XMLMutex& getDOMImplSrcVectorMutex()
- {
- static XMLRegisterCleanup cleanupDOMImplSrcVectorMutex;
- if (!gDOMImplSrcVectorMutex)
- {
- XMLMutex* tmpMutex = new XMLMutex;
- if (XMLPlatformUtils::compareAndSwap((void**)&gDOMImplSrcVectorMutex, tmpMutex, 0))
- {
- // Someone beat us to it, so let's clean up ours
- delete tmpMutex;
- }
- else
- cleanupDOMImplSrcVectorMutex.registerCleanup(reinitDOMImplSrcVectorMutex);
- }
- return *gDOMImplSrcVectorMutex;
- }
- // -----------------------------------------------------------------------
- // DOMImplementationRegistry Functions
- // -----------------------------------------------------------------------
- DOMImplementation *DOMImplementationRegistry::getDOMImplementation(const XMLCh* features) {
- XMLMutexLock lock(&getDOMImplSrcVectorMutex());
- unsigned int len = getDOMImplSrcVector()->size();
- // Put our defined source there
- if (len == 0)
- getDOMImplSrcVector()->addElement((DOMImplementationSource*)DOMImplementationImpl::getDOMImplementationImpl());
- len = getDOMImplSrcVector()->size();
- for (unsigned int i = len; i > 0; i--) {
- DOMImplementationSource* source = getDOMImplSrcVector()->elementAt(i-1);
- DOMImplementation* impl = source->getDOMImplementation(features);
- if (impl)
- return impl;
- }
- return 0;
- }
- void DOMImplementationRegistry::addSource (DOMImplementationSource* source) {
- XMLMutexLock lock(&getDOMImplSrcVectorMutex());
- getDOMImplSrcVector()->addElement(source);
- }
- XERCES_CPP_NAMESPACE_END