664 lines
20 KiB
C
664 lines
20 KiB
C
/*
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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: RefHashTableOf.c 678409 2008-07-21 13:08:10Z borisk $
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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/RefHashTableOf.hpp>
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#endif
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#include <xercesc/util/Janitor.hpp>
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#include <xercesc/util/XMLString.hpp>
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#include <xercesc/util/NullPointerException.hpp>
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#include <new>
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XERCES_CPP_NAMESPACE_BEGIN
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Constructors and Destructor
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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RefHashTableOf<TVal, THasher>::RefHashTableOf(
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const XMLSize_t modulus,
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MemoryManager* const manager)
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: fMemoryManager(manager)
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, fAdoptedElems(true)
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, fBucketList(0)
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, fHashModulus(modulus)
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, fInitialModulus(modulus)
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, fCount(0)
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{
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initialize(modulus);
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}
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template <class TVal, class THasher>
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RefHashTableOf<TVal, THasher>::RefHashTableOf(
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const XMLSize_t modulus,
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const THasher& hasher,
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MemoryManager* const manager)
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: fMemoryManager(manager)
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, fAdoptedElems(true)
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, fBucketList(0)
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, fHashModulus(modulus)
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, fInitialModulus(modulus)
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, fCount(0)
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, fHasher (hasher)
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{
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initialize(modulus);
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}
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template <class TVal, class THasher>
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RefHashTableOf<TVal, THasher>::RefHashTableOf(
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const XMLSize_t modulus,
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const bool adoptElems,
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MemoryManager* const manager)
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: fMemoryManager(manager)
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, fAdoptedElems(adoptElems)
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, fBucketList(0)
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, fHashModulus(modulus)
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, fInitialModulus(modulus)
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, fCount(0)
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{
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initialize(modulus);
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}
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template <class TVal, class THasher>
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RefHashTableOf<TVal, THasher>::RefHashTableOf(
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const XMLSize_t modulus,
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const bool adoptElems,
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const THasher& hasher,
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MemoryManager* const manager)
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: fMemoryManager(manager)
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, fAdoptedElems(adoptElems)
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, fBucketList(0)
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, fHashModulus(modulus)
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, fInitialModulus(modulus)
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, fCount(0)
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, fHasher (hasher)
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{
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initialize(modulus);
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}
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::initialize(const XMLSize_t 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 = (RefHashTableBucketElem<TVal>**) fMemoryManager->allocate
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(
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fHashModulus * sizeof(RefHashTableBucketElem<TVal>*)
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);
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for (XMLSize_t index = 0; index < fHashModulus; index++)
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fBucketList[index] = 0;
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}
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template <class TVal, class THasher>
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RefHashTableOf<TVal, THasher>::~RefHashTableOf()
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{
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cleanup();
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}
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Element management
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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inline bool RefHashTableOf<TVal, THasher>::isEmpty() const
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{
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return fCount==0;
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}
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template <class TVal, class THasher>
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inline bool RefHashTableOf<TVal, THasher>::containsKey(const void* const key) const
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{
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XMLSize_t hashVal;
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const RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
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return (findIt != 0);
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}
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::
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removeKey(const void* const key)
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{
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// Hash the key
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XMLSize_t hashVal = fHasher.getHashVal(key, fHashModulus);
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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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RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
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RefHashTableBucketElem<TVal>* lastElem = 0;
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while (curElem)
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{
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if (fHasher.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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{
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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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// If we adopted the data, then delete it too
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// (Note: the userdata hash table instance has data type of void *.
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// This will generate compiler warnings here on some platforms, but they
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// can be ignored since fAdoptedElements is false.
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if (fAdoptedElems)
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delete curElem->fData;
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// Then delete the current element and move forward
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// delete curElem;
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// destructor doesn't do anything...
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fMemoryManager->deallocate(curElem);
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fCount--;
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return;
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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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// We never found that key
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager);
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}
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::removeAll()
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{
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if(isEmpty())
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return;
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// Clean up the buckets first
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for (XMLSize_t buckInd = 0; buckInd < fHashModulus; buckInd++)
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{
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// Get the bucket list head for this entry
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RefHashTableBucketElem<TVal>* curElem = fBucketList[buckInd];
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RefHashTableBucketElem<TVal>* nextElem;
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while (curElem)
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{
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// Save the next element before we hose this one
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nextElem = curElem->fNext;
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// If we adopted the data, then delete it too
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// (Note: the userdata hash table instance has data type of void *.
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// This will generate compiler warnings here on some platforms, but they
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// can be ignored since fAdoptedElements is false.
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if (fAdoptedElems)
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delete curElem->fData;
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// Then delete the current element and move forward
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// delete curElem;
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// destructor doesn't do anything...
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// curElem->~RefHashTableBucketElem();
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fMemoryManager->deallocate(curElem);
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curElem = nextElem;
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}
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// Clean out this entry
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fBucketList[buckInd] = 0;
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}
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fCount = 0;
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}
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// This method returns the data associated with a key. The key entry is deleted. The caller
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// now owns the returned data (case of hashtable adopting the data).
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// This function is called by transferElement so that the undeleted data can be transferred
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// to a new key which will own that data.
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template <class TVal, class THasher> TVal* RefHashTableOf<TVal, THasher>::
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orphanKey(const void* const key)
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{
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// Hash the key
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TVal* retVal = 0;
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XMLSize_t hashVal = fHasher.getHashVal(key, fHashModulus);
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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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RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
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RefHashTableBucketElem<TVal>* lastElem = 0;
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while (curElem)
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{
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if (fHasher.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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{
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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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retVal = curElem->fData;
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// Delete the current element
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// delete curElem;
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// destructor doesn't do anything...
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// curElem->~RefHashTableBucketElem();
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fMemoryManager->deallocate(curElem);
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break;
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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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// We never found that key
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if (!retVal)
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ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager);
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return retVal;
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}
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//
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// cleanup():
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// similar to destructor
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// called to cleanup the memory, in case destructor cannot be called
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//
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::cleanup()
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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);
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fBucketList = 0;
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}
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//
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// reinitialize():
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// similar to constructor
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// called to re-construct the fElemList from scratch again
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//
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::reinitialize(const THasher& hasher)
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{
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if (fBucketList)
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cleanup();
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fHasher = hasher;
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fHashModulus = fInitialModulus;
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initialize(fHashModulus);
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}
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// this function transfer the data from key1 to key2
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// this is equivalent to calling
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// 1. get(key1) to retrieve the data,
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// 2. removeKey(key1),
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// 3. and then put(key2, data)
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// except that the data is not deleted in "removeKey" even it is adopted so that it
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// can be transferred to key2.
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// whatever key2 has originally will be purged (if adopted)
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template <class TVal, class THasher>
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inline void RefHashTableOf<TVal, THasher>::transferElement(const void* const key1, void* key2)
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{
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put(key2, orphanKey(key1));
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}
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Getters
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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inline TVal* RefHashTableOf<TVal, THasher>::get(const void* const key)
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{
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XMLSize_t hashVal;
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RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
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return findIt ? findIt->fData : 0;
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}
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template <class TVal, class THasher>
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inline const TVal* RefHashTableOf<TVal, THasher>::
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get(const void* const key) const
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{
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XMLSize_t hashVal;
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const RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
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return findIt ? findIt->fData : 0;
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}
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template <class TVal, class THasher>
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inline MemoryManager* RefHashTableOf<TVal, THasher>::getMemoryManager() const
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{
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return fMemoryManager;
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}
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template <class TVal, class THasher>
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inline XMLSize_t RefHashTableOf<TVal, THasher>::getHashModulus() const
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{
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return fHashModulus;
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}
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template <class TVal, class THasher>
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inline XMLSize_t RefHashTableOf<TVal, THasher>::getCount() const
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{
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return fCount;
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}
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Getters
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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inline void RefHashTableOf<TVal, THasher>::setAdoptElements(const bool aValue)
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{
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fAdoptedElems = aValue;
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}
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Putters
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::put(void* key, TVal* const valueToAdopt)
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{
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// Apply 0.75 load factor to find threshold.
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XMLSize_t threshold = fHashModulus * 3 / 4;
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// If we've grown too big, expand the table and rehash.
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if (fCount >= threshold)
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rehash();
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// First see if the key exists already
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XMLSize_t hashVal;
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RefHashTableBucketElem<TVal>* newBucket = findBucketElem(key, hashVal);
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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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if (fAdoptedElems)
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delete newBucket->fData;
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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(RefHashTableBucketElem<TVal>)))
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RefHashTableBucketElem<TVal>(key, valueToAdopt, fBucketList[hashVal]);
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fBucketList[hashVal] = newBucket;
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fCount++;
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}
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}
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// ---------------------------------------------------------------------------
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// RefHashTableOf: Private methods
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// ---------------------------------------------------------------------------
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template <class TVal, class THasher>
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void RefHashTableOf<TVal, THasher>::rehash()
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{
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const XMLSize_t newMod = (fHashModulus * 2) + 1;
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RefHashTableBucketElem<TVal>** newBucketList =
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(RefHashTableBucketElem<TVal>**) fMemoryManager->allocate
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(
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newMod * sizeof(RefHashTableBucketElem<TVal>*)
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);
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// Make sure the new bucket list is destroyed if an
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// exception is thrown.
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ArrayJanitor<RefHashTableBucketElem<TVal>*> guard(newBucketList, fMemoryManager);
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memset(newBucketList, 0, newMod * sizeof(newBucketList[0]));
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// Rehash all existing entries.
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for (XMLSize_t index = 0; index < fHashModulus; index++)
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{
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// Get the bucket list head for this entry
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RefHashTableBucketElem<TVal>* curElem = fBucketList[index];
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while (curElem)
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{
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// Save the next element before we detach this one
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RefHashTableBucketElem<TVal>* const nextElem = curElem->fNext;
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const XMLSize_t hashVal = fHasher.getHashVal(curElem->fKey, newMod);
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RefHashTableBucketElem<TVal>* const newHeadElem = newBucketList[hashVal];
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// Insert at the start of this bucket's list.
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curElem->fNext = newHeadElem;
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newBucketList[hashVal] = curElem;
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curElem = nextElem;
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}
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}
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RefHashTableBucketElem<TVal>** const oldBucketList = fBucketList;
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// Everything is OK at this point, so update the
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// member variables.
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fBucketList = guard.release();
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fHashModulus = newMod;
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// Delete the old bucket list.
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fMemoryManager->deallocate(oldBucketList);//delete[] oldBucketList;
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}
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template <class TVal, class THasher>
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inline RefHashTableBucketElem<TVal>* RefHashTableOf<TVal, THasher>::
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findBucketElem(const void* const key, XMLSize_t& hashVal)
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{
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// Hash the key
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hashVal = fHasher.getHashVal(key, fHashModulus);
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// Search that bucket for the key
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RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
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while (curElem)
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{
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if (fHasher.equals(key, curElem->fKey))
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return curElem;
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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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template <class TVal, class THasher>
|
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inline const RefHashTableBucketElem<TVal>* RefHashTableOf<TVal, THasher>::
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findBucketElem(const void* const key, XMLSize_t& hashVal) const
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{
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// Hash the key
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hashVal = fHasher.getHashVal(key, fHashModulus);
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// Search that bucket for the key
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const RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
|
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while (curElem)
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{
|
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if (fHasher.equals(key, curElem->fKey))
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return curElem;
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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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// ---------------------------------------------------------------------------
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// RefHashTableOfEnumerator: Constructors and Destructor
|
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// ---------------------------------------------------------------------------
|
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template <class TVal, class THasher> RefHashTableOfEnumerator<TVal, THasher>::
|
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RefHashTableOfEnumerator(RefHashTableOf<TVal, THasher>* const toEnum
|
|
, const bool adopt
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, MemoryManager* const manager)
|
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: fAdopted(adopt), fCurElem(0), fCurHash((XMLSize_t)-1), fToEnum(toEnum)
|
|
, fMemoryManager(manager)
|
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{
|
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if (!toEnum)
|
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ThrowXMLwithMemMgr(NullPointerException, XMLExcepts::CPtr_PointerIsZero, fMemoryManager);
|
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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
|
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// from the beginning.
|
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//
|
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findNext();
|
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}
|
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template <class TVal, class THasher>
|
|
RefHashTableOfEnumerator<TVal, THasher>::~RefHashTableOfEnumerator()
|
|
{
|
|
if (fAdopted)
|
|
delete fToEnum;
|
|
}
|
|
|
|
|
|
template <class TVal, class THasher> RefHashTableOfEnumerator<TVal, THasher>::
|
|
RefHashTableOfEnumerator(const RefHashTableOfEnumerator<TVal, THasher>& toCopy) :
|
|
XMLEnumerator<TVal>(toCopy)
|
|
, XMemory(toCopy)
|
|
, fAdopted(toCopy.fAdopted)
|
|
, fCurElem(toCopy.fCurElem)
|
|
, fCurHash(toCopy.fCurHash)
|
|
, fToEnum(toCopy.fToEnum)
|
|
, fMemoryManager(toCopy.fMemoryManager)
|
|
{
|
|
}
|
|
// ---------------------------------------------------------------------------
|
|
// RefHashTableOfEnumerator: Enum interface
|
|
// ---------------------------------------------------------------------------
|
|
template <class TVal, class THasher>
|
|
bool RefHashTableOfEnumerator<TVal, THasher>::hasMoreElements() const
|
|
{
|
|
//
|
|
// If our current has is at the max and there are no more elements
|
|
// in the current bucket, then no more elements.
|
|
//
|
|
if (!fCurElem && (fCurHash == fToEnum->fHashModulus))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template <class TVal, class THasher>
|
|
TVal& RefHashTableOfEnumerator<TVal, THasher>::nextElement()
|
|
{
|
|
// Make sure we have an element to return
|
|
if (!hasMoreElements())
|
|
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager);
|
|
|
|
//
|
|
// Save the current element, then move up to the next one for the
|
|
// next time around.
|
|
//
|
|
RefHashTableBucketElem<TVal>* saveElem = fCurElem;
|
|
findNext();
|
|
|
|
return *saveElem->fData;
|
|
}
|
|
|
|
template <class TVal, class THasher>
|
|
void* RefHashTableOfEnumerator<TVal, THasher>::nextElementKey()
|
|
{
|
|
// Make sure we have an element to return
|
|
if (!hasMoreElements())
|
|
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager);
|
|
|
|
//
|
|
// Save the current element, then move up to the next one for the
|
|
// next time around.
|
|
//
|
|
RefHashTableBucketElem<TVal>* saveElem = fCurElem;
|
|
findNext();
|
|
|
|
return saveElem->fKey;
|
|
}
|
|
|
|
template <class TVal, class THasher>
|
|
void RefHashTableOfEnumerator<TVal, THasher>::Reset()
|
|
{
|
|
fCurHash = (XMLSize_t)-1;
|
|
fCurElem = 0;
|
|
findNext();
|
|
}
|
|
|
|
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// RefHashTableOfEnumerator: Private helper methods
|
|
// ---------------------------------------------------------------------------
|
|
template <class TVal, class THasher>
|
|
void RefHashTableOfEnumerator<TVal, THasher>::findNext()
|
|
{
|
|
//
|
|
// If there is a current element, move to its next element. If this
|
|
// hits the end of the bucket, the next block will handle the rest.
|
|
//
|
|
if (fCurElem)
|
|
fCurElem = fCurElem->fNext;
|
|
|
|
//
|
|
// If the current element is null, then we have to move up to the
|
|
// next hash value. If that is the hash modulus, then we cannot
|
|
// go further.
|
|
//
|
|
if (!fCurElem)
|
|
{
|
|
fCurHash++;
|
|
if (fCurHash == fToEnum->fHashModulus)
|
|
return;
|
|
|
|
// Else find the next non-empty bucket
|
|
while (fToEnum->fBucketList[fCurHash]==0)
|
|
{
|
|
// Bump to the next hash value. If we max out return
|
|
fCurHash++;
|
|
if (fCurHash == fToEnum->fHashModulus)
|
|
return;
|
|
}
|
|
fCurElem = fToEnum->fBucketList[fCurHash];
|
|
}
|
|
}
|
|
|
|
XERCES_CPP_NAMESPACE_END
|