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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/* |
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* $Id: StringPool.hpp 568078 2007-08-21 11:43:25Z amassari $ |
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*/ |
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|
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#if !defined(STRINGPOOL_HPP) |
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#define STRINGPOOL_HPP |
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|
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#include <xercesc/util/RefHashTableOf.hpp> |
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#include <xercesc/internal/XSerializable.hpp> |
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XERCES_CPP_NAMESPACE_BEGIN |
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|
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// |
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// This class implements a string pool, in which strings can be added and |
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// given a unique id by which they can be refered. It has to provide fast |
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// access both mapping from a string to its id and mapping from an id to |
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// its string. This requires that it provide two separate data structures. |
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// The map one is a hash table for quick storage and look up by name. The |
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// other is an array ordered by unique id which maps to the element in the |
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// hash table. |
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// |
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// This works because strings cannot be removed from the pool once added, |
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// other than flushing it completely, and because ids are assigned |
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// sequentially from 1. |
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// |
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class XMLUTIL_EXPORT XMLStringPool : public XSerializable, 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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XMLStringPool |
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( |
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const unsigned int modulus = 109 |
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, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager |
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); |
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virtual ~XMLStringPool(); |
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// ----------------------------------------------------------------------- |
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// Pool management methods |
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// ----------------------------------------------------------------------- |
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virtual unsigned int addOrFind(const XMLCh* const newString); |
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virtual bool exists(const XMLCh* const newString) const; |
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virtual bool exists(const unsigned int id) const; |
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virtual void flushAll(); |
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virtual unsigned int getId(const XMLCh* const toFind) const; |
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virtual const XMLCh* getValueForId(const unsigned int id) const; |
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virtual unsigned int getStringCount() const; |
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/*** |
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* Support for Serialization/De-serialization |
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***/ |
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DECL_XSERIALIZABLE(XMLStringPool) |
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XMLStringPool(MemoryManager* const manager); |
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private : |
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// ----------------------------------------------------------------------- |
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// Private data types |
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// ----------------------------------------------------------------------- |
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struct PoolElem |
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{ |
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unsigned int fId; |
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XMLCh* fString; |
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}; |
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// ----------------------------------------------------------------------- |
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// Unimplemented constructors and operators |
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// ----------------------------------------------------------------------- |
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XMLStringPool(const XMLStringPool&); |
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XMLStringPool& operator=(const XMLStringPool&); |
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// ----------------------------------------------------------------------- |
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// Private helper methods |
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// ----------------------------------------------------------------------- |
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unsigned int addNewEntry(const XMLCh* const newString); |
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// ----------------------------------------------------------------------- |
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// Private data members |
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// |
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// fIdMap |
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// This is an array of pointers to the pool elements. It is ordered |
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// by unique id, so using an id to index it gives instant access to |
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// the string of that id. This is grown as required. |
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// |
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// fHashTable |
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// This is the hash table used to store and quickly access the |
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// strings. |
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// |
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// fMapCapacity |
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// The current capacity of the id map. When the current id hits this |
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// value the map must must be expanded. |
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// |
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// ----------------------------------------------------------------------- |
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MemoryManager* fMemoryManager; |
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PoolElem** fIdMap; |
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RefHashTableOf<PoolElem>* fHashTable; |
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unsigned int fMapCapacity; |
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|
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protected: |
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// protected data members |
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// fCurId |
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// This is the counter used to assign unique ids. It is just bumped |
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// up one for each new string added. |
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unsigned int fCurId; |
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}; |
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|
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|
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// Provid inline versions of some of the simple functions to improve performance. |
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inline unsigned int XMLStringPool::addOrFind(const XMLCh* const newString) |
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{ |
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PoolElem* elemToFind = fHashTable->get(newString); |
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if (elemToFind) |
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return elemToFind->fId; |
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|
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return addNewEntry(newString); |
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} |
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|
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inline unsigned int XMLStringPool::getId(const XMLCh* const toFind) const |
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{ |
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PoolElem* elemToFind = fHashTable->get(toFind); |
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if (elemToFind) |
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return elemToFind->fId; |
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|
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// Not found, so return zero, which is never a legal id |
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return 0; |
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} |
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|
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inline bool XMLStringPool::exists(const XMLCh* const newString) const |
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{ |
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return fHashTable->containsKey(newString); |
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} |
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|
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inline bool XMLStringPool::exists(const unsigned int id) const |
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{ |
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if (!id || (id >= fCurId)) |
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return false; |
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return true; |
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} |
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|
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inline const XMLCh* XMLStringPool::getValueForId(const unsigned int id) const |
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{ |
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if (!id || (id >= fCurId)) |
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ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::StrPool_IllegalId, fMemoryManager); |
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|
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// Just index the id map and return that element's string |
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return fIdMap[id]->fString; |
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} |
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|
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inline unsigned int XMLStringPool::getStringCount() const |
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{ |
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return fCurId-1; |
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} |
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XERCES_CPP_NAMESPACE_END |
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#endif |