author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 20:28:24 +0200 | |
changeset 2 | 661f3784fe57 |
parent 1 | c42dffbd5b4f |
permissions | -rw-r--r-- |
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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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* $Id: ValueHashTableOf.c 568078 2007-08-21 11:43:25Z amassari $ |
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*/ |
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|
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// --------------------------------------------------------------------------- |
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// Include |
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// --------------------------------------------------------------------------- |
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#if defined(XERCES_TMPLSINC) |
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#include <xercesc/util/ValueHashTableOf.hpp> |
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#endif |
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#include <xercesc/util/NullPointerException.hpp> |
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#include <assert.h> |
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#include <new> |
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XERCES_CPP_NAMESPACE_BEGIN |
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOf: Constructors and Destructor |
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// --------------------------------------------------------------------------- |
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template <class TVal> |
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ValueHashTableOf<TVal>::ValueHashTableOf( const unsigned int modulus |
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, HashBase* hashBase |
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, MemoryManager* const manager) |
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: fMemoryManager(manager) |
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, fBucketList(0) |
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, fHashModulus(modulus) |
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, fHash(0) |
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{ |
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initialize(modulus); |
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// set hasher |
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fHash = hashBase; |
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} |
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|
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template <class TVal> |
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ValueHashTableOf<TVal>::ValueHashTableOf( const unsigned int modulus |
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, MemoryManager* const manager) |
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: fMemoryManager(manager) |
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, fBucketList(0) |
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, fHashModulus(modulus) |
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, fHash(0) |
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{ |
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initialize(modulus); |
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|
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// create default hasher |
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fHash = new (fMemoryManager) HashXMLCh(); |
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} |
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|
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template <class TVal> void ValueHashTableOf<TVal>::initialize(const unsigned int modulus) |
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{ |
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if (modulus == 0) |
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ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::HshTbl_ZeroModulus, fMemoryManager); |
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// Allocate the bucket list and zero them |
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fBucketList = (ValueHashTableBucketElem<TVal>**) fMemoryManager->allocate |
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( |
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fHashModulus * sizeof(ValueHashTableBucketElem<TVal>*) |
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); //new ValueHashTableBucketElem<TVal>*[fHashModulus]; |
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memset(fBucketList, 0, sizeof(fBucketList[0]) * fHashModulus); |
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} |
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template <class TVal> ValueHashTableOf<TVal>::~ValueHashTableOf() |
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{ |
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removeAll(); |
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// Then delete the bucket list & hasher |
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fMemoryManager->deallocate(fBucketList); //delete [] fBucketList; |
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delete fHash; |
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} |
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOf: Element management |
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// --------------------------------------------------------------------------- |
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template <class TVal> bool ValueHashTableOf<TVal>::isEmpty() const |
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{ |
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// Just check the bucket list for non-empty elements |
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for (unsigned int buckInd = 0; buckInd < fHashModulus; buckInd++) |
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{ |
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if (fBucketList[buckInd] != 0) |
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return false; |
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} |
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return true; |
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} |
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template <class TVal> bool ValueHashTableOf<TVal>:: |
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containsKey(const void* const key) const |
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{ |
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unsigned int hashVal; |
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const ValueHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal); |
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return (findIt != 0); |
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} |
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111 |
|
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template <class TVal> void ValueHashTableOf<TVal>:: |
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removeKey(const void* const key) |
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114 |
{ |
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unsigned int hashVal; |
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removeBucketElem(key, hashVal); |
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} |
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118 |
|
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template <class TVal> void ValueHashTableOf<TVal>::removeAll() |
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120 |
{ |
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// Clean up the buckets first |
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for (unsigned int buckInd = 0; buckInd < fHashModulus; buckInd++) |
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123 |
{ |
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// Get the bucket list head for this entry |
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ValueHashTableBucketElem<TVal>* curElem = fBucketList[buckInd]; |
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ValueHashTableBucketElem<TVal>* nextElem; |
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while (curElem) |
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128 |
{ |
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// Save the next element before we hose this one |
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nextElem = curElem->fNext; |
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|
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// delete the current element and move forward |
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// destructor is empty... |
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// curElem->~ValueHashTableBucketElem(); |
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fMemoryManager->deallocate(curElem); |
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curElem = nextElem; |
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} |
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138 |
|
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// Clean out this entry |
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fBucketList[buckInd] = 0; |
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} |
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} |
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143 |
|
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144 |
|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOf: Getters |
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// --------------------------------------------------------------------------- |
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template <class TVal> TVal& ValueHashTableOf<TVal>::get(const void* const key, MemoryManager* const manager) |
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149 |
{ |
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unsigned int hashVal; |
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ValueHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal); |
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if (!findIt) |
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, manager); |
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|
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return findIt->fData; |
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} |
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|
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template <class TVal> const TVal& ValueHashTableOf<TVal>:: |
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get(const void* const key) const |
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{ |
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unsigned int hashVal; |
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const ValueHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal); |
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if (!findIt) |
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager); |
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|
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return findIt->fData; |
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} |
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|
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOf: Putters |
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// --------------------------------------------------------------------------- |
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template <class TVal> void ValueHashTableOf<TVal>::put(void* key, const TVal& valueToAdopt) |
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{ |
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// First see if the key exists already |
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unsigned int hashVal; |
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ValueHashTableBucketElem<TVal>* newBucket = findBucketElem(key, hashVal); |
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|
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// |
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// If so,then update its value. If not, then we need to add it to |
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// the right bucket |
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// |
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if (newBucket) |
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{ |
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newBucket->fData = valueToAdopt; |
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newBucket->fKey = key; |
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} |
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else |
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{ |
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newBucket = |
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new (fMemoryManager->allocate(sizeof(ValueHashTableBucketElem<TVal>))) |
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ValueHashTableBucketElem<TVal>(key, valueToAdopt, fBucketList[hashVal]); |
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fBucketList[hashVal] = newBucket; |
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} |
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} |
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|
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|
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOf: Private methods |
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// --------------------------------------------------------------------------- |
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template <class TVal> ValueHashTableBucketElem<TVal>* ValueHashTableOf<TVal>:: |
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findBucketElem(const void* const key, unsigned int& hashVal) |
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{ |
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// Hash the key |
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hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager); |
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assert(hashVal < fHashModulus); |
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|
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// Search that bucket for the key |
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ValueHashTableBucketElem<TVal>* curElem = fBucketList[hashVal]; |
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while (curElem) |
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{ |
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if (fHash->equals(key, curElem->fKey)) |
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return curElem; |
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|
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curElem = curElem->fNext; |
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} |
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return 0; |
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} |
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|
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template <class TVal> const ValueHashTableBucketElem<TVal>* ValueHashTableOf<TVal>:: |
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findBucketElem(const void* const key, unsigned int& hashVal) const |
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{ |
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// Hash the key |
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hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager); |
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assert(hashVal < fHashModulus); |
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|
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// Search that bucket for the key |
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const ValueHashTableBucketElem<TVal>* curElem = fBucketList[hashVal]; |
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while (curElem) |
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{ |
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if (fHash->equals(key, curElem->fKey)) |
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return curElem; |
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|
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curElem = curElem->fNext; |
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} |
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return 0; |
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} |
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239 |
|
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|
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template <class TVal> void ValueHashTableOf<TVal>:: |
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removeBucketElem(const void* const key, unsigned int& hashVal) |
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{ |
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// Hash the key |
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hashVal = fHash->getHashVal(key, fHashModulus); |
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assert(hashVal < fHashModulus); |
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|
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// |
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// Search the given bucket for this key. Keep up with the previous |
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// element so we can patch around it. |
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// |
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ValueHashTableBucketElem<TVal>* curElem = fBucketList[hashVal]; |
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ValueHashTableBucketElem<TVal>* lastElem = 0; |
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|
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while (curElem) |
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{ |
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if (fHash->equals(key, curElem->fKey)) |
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{ |
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if (!lastElem) |
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{ |
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// It was the first in the bucket |
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fBucketList[hashVal] = curElem->fNext; |
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} |
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else |
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265 |
{ |
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// Patch around the current element |
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lastElem->fNext = curElem->fNext; |
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} |
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269 |
|
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// Delete the current element |
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// delete curElem; |
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// destructor is empty... |
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// curElem->~ValueHashTableBucketElem(); |
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fMemoryManager->deallocate(curElem); |
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|
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return; |
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} |
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|
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// Move both pointers upwards |
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lastElem = curElem; |
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curElem = curElem->fNext; |
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} |
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283 |
|
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// We never found that key |
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager); |
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} |
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287 |
|
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288 |
|
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289 |
|
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290 |
|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOfEnumerator: Constructors and Destructor |
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// --------------------------------------------------------------------------- |
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template <class TVal> ValueHashTableOfEnumerator<TVal>:: |
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ValueHashTableOfEnumerator(ValueHashTableOf<TVal>* const toEnum |
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, const bool adopt |
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, MemoryManager* const manager) |
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: fAdopted(adopt), fCurElem(0), fCurHash((unsigned int)-1), fToEnum(toEnum), fMemoryManager(manager) |
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{ |
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if (!toEnum) |
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ThrowXMLwithMemMgr(NullPointerException, XMLExcepts::CPtr_PointerIsZero, manager); |
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|
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// |
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// Find the next available bucket element in the hash table. If it |
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// comes back zero, that just means the table is empty. |
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// |
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// Note that the -1 in the current hash tells it to start from the |
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// beginning. |
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309 |
// |
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findNext(); |
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311 |
} |
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312 |
|
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template <class TVal> ValueHashTableOfEnumerator<TVal>::~ValueHashTableOfEnumerator() |
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{ |
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if (fAdopted) |
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delete fToEnum; |
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} |
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|
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOfEnumerator: Enum interface |
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// --------------------------------------------------------------------------- |
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template <class TVal> bool ValueHashTableOfEnumerator<TVal>::hasMoreElements() const |
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{ |
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// |
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// If our current has is at the max and there are no more elements |
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// in the current bucket, then no more elements. |
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// |
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if (!fCurElem && (fCurHash == fToEnum->fHashModulus)) |
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return false; |
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return true; |
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} |
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|
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template <class TVal> TVal& ValueHashTableOfEnumerator<TVal>::nextElement() |
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{ |
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// Make sure we have an element to return |
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if (!hasMoreElements()) |
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager); |
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|
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// |
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// Save the current element, then move up to the next one for the |
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// next time around. |
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// |
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ValueHashTableBucketElem<TVal>* saveElem = fCurElem; |
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findNext(); |
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|
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return saveElem->fData; |
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} |
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|
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template <class TVal> void* ValueHashTableOfEnumerator<TVal>::nextElementKey() |
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351 |
{ |
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// Make sure we have an element to return |
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if (!hasMoreElements()) |
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager); |
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|
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// |
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// Save the current element, then move up to the next one for the |
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// next time around. |
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// |
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ValueHashTableBucketElem<TVal>* saveElem = fCurElem; |
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findNext(); |
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|
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return saveElem->fKey; |
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} |
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|
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|
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template <class TVal> void ValueHashTableOfEnumerator<TVal>::Reset() |
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{ |
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fCurHash = (unsigned int)-1; |
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fCurElem = 0; |
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findNext(); |
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} |
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|
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|
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|
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// --------------------------------------------------------------------------- |
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// ValueHashTableOfEnumerator: Private helper methods |
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// --------------------------------------------------------------------------- |
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template <class TVal> void ValueHashTableOfEnumerator<TVal>::findNext() |
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{ |
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381 |
// |
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// If there is a current element, move to its next element. If this |
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// hits the end of the bucket, the next block will handle the rest. |
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384 |
// |
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if (fCurElem) |
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fCurElem = fCurElem->fNext; |
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|
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388 |
// |
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// If the current element is null, then we have to move up to the |
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// next hash value. If that is the hash modulus, then we cannot |
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// go further. |
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392 |
// |
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if (!fCurElem) |
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{ |
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fCurHash++; |
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if (fCurHash == fToEnum->fHashModulus) |
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return; |
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398 |
|
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// Else find the next non-empty bucket |
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while (fToEnum->fBucketList[fCurHash]==0) |
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401 |
{ |
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// Bump to the next hash value. If we max out return |
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fCurHash++; |
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if (fCurHash == fToEnum->fHashModulus) |
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return; |
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} |
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fCurElem = fToEnum->fBucketList[fCurHash]; |
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408 |
} |
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409 |
} |
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410 |
|
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411 |
XERCES_CPP_NAMESPACE_END |