author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 12:52:45 +0200 | |
changeset 1 | c42dffbd5b4f |
parent 0 | ba25891c3a9e |
child 2 | 661f3784fe57 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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|
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#if !defined(XMLBUFFERMGR_HPP) |
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#define XMLBUFFERMGR_HPP |
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#include <xercesc/framework/XMLBuffer.hpp> |
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|
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XERCES_CPP_NAMESPACE_BEGIN |
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class XMLBufBid; |
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/** |
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* There are many places where XMLBuffer objects are needed. In order to |
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* avoid either constantly creating and destroying them or maintaining a |
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* fixed set and worrying about accidental reuse, a buffer manager can |
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* provide a pool of buffers which can be temporarily used and then put |
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* back into the pool. This provides a good compromise between performance |
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* and easier maintenance. |
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*/ |
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class XMLPARSER_EXPORT XMLBufferMgr : public XMemory |
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{ |
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public : |
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// ----------------------------------------------------------------------- |
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// Constructors and Destructor |
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// ----------------------------------------------------------------------- |
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/** @name Constructor */ |
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//@{ |
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XMLBufferMgr(MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager); |
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//@} |
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/** @name Destructor */ |
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//@{ |
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~XMLBufferMgr(); |
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//@} |
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|
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// ----------------------------------------------------------------------- |
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// Buffer management |
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// ----------------------------------------------------------------------- |
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XMLBuffer& bidOnBuffer(); |
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void releaseBuffer(XMLBuffer& toRelease); |
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// ----------------------------------------------------------------------- |
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// Getter methods |
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// ----------------------------------------------------------------------- |
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unsigned int getBufferCount() const; |
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unsigned int getAvailableBufferCount() const; |
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private : |
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// ----------------------------------------------------------------------- |
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// Unimplemented constructors and operators |
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// ----------------------------------------------------------------------- |
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XMLBufferMgr(const XMLBufferMgr&); |
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XMLBufferMgr& operator=(const XMLBufferMgr&); |
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// ----------------------------------------------------------------------- |
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// Private data members |
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// |
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// fBufCount |
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// The count of buffers that have been allocated so far. |
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// |
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// fBufList; |
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// The list of pointers to buffers that are loaned out. There will |
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// never be a lot of them, so a flat list is good enough. |
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// ----------------------------------------------------------------------- |
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unsigned int fBufCount; |
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MemoryManager* fMemoryManager; |
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XMLBuffer** fBufList; |
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}; |
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inline unsigned int XMLBufferMgr::getBufferCount() const |
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{ |
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return fBufCount; |
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} |
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107 |
|
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inline unsigned int XMLBufferMgr::getAvailableBufferCount() const |
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109 |
{ |
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unsigned available = fBufCount; |
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for (unsigned int index = 0; index < fBufCount && fBufList[index]; index++) |
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112 |
{ |
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if (fBufList[index]->getInUse()) |
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--available; |
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} |
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return available; |
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} |
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118 |
|
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|
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/** |
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* XMLBufBid is a scoped based janitor that allows the scanner code to ask |
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* for a buffer on a scoped basis and then insure that it gets freed back |
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* into the pool no matter how the scope is exited (exception or normal exit.) |
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*/ |
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class XMLBufBid : public XMemory |
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126 |
{ |
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public : |
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// ----------------------------------------------------------------------- |
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// Constructors and Destructor |
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// ----------------------------------------------------------------------- |
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XMLBufBid(XMLBufferMgr* const srcMgr) : |
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132 |
|
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fBuffer(srcMgr->bidOnBuffer()) |
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, fMgr(srcMgr) |
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135 |
{ |
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} |
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137 |
|
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~XMLBufBid() |
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139 |
{ |
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fMgr->releaseBuffer(fBuffer); |
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} |
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142 |
|
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143 |
|
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144 |
|
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// ----------------------------------------------------------------------- |
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// Buffer access |
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// ----------------------------------------------------------------------- |
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void append(const XMLCh toAppend) |
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149 |
{ |
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fBuffer.append(toAppend); |
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} |
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152 |
|
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void append(const XMLCh* const toAppend, const unsigned int count = 0) |
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154 |
{ |
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fBuffer.append(toAppend, count); |
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} |
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157 |
|
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const XMLBuffer& getBuffer() const |
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{ |
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return fBuffer; |
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} |
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162 |
|
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XMLBuffer& getBuffer() |
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{ |
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return fBuffer; |
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} |
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|
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const XMLCh* getRawBuffer() const |
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{ |
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fBuffer.fBuffer[fBuffer.fIndex] = 0; |
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return fBuffer.fBuffer; |
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} |
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173 |
|
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XMLCh* getRawBuffer() |
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{ |
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fBuffer.fBuffer[fBuffer.fIndex] = 0; |
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return fBuffer.fBuffer; |
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} |
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|
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unsigned int getLen() const |
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{ |
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return fBuffer.fIndex; |
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} |
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184 |
|
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bool isEmpty() const |
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{ |
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return (fBuffer.fIndex == 0); |
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} |
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|
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void reset() |
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{ |
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fBuffer.reset(); |
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} |
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|
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void set(const XMLCh* const chars, const unsigned int count = 0) |
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{ |
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fBuffer.set(chars, count); |
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} |
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199 |
|
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200 |
|
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private : |
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// ----------------------------------------------------------------------- |
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// Unimplemented constructors and operators |
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// ----------------------------------------------------------------------- |
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XMLBufBid(const XMLBufBid&); |
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XMLBufBid& operator=(const XMLBufBid&); |
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|
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// ----------------------------------------------------------------------- |
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// Private data members |
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// |
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// fBuffer |
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// This is the buffer we got, and which we will release. |
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// |
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// fMgr |
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// This is the buffer manager we got the buffer from. This is needed |
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// to release the buffer later. |
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// ----------------------------------------------------------------------- |
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XMLBuffer& fBuffer; |
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XMLBufferMgr* const fMgr; |
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}; |
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XERCES_CPP_NAMESPACE_END |
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#endif |