refhash2keystableof.c

经典开源游戏glest的源代码

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: RefHash2KeysTableOf.c 568078 2007-08-21 11:43:25Z amassari $
 */


// ---------------------------------------------------------------------------
//  Include
// ---------------------------------------------------------------------------
#if defined(XERCES_TMPLSINC)
#include <xercesc/util/RefHash2KeysTableOf.hpp>
#endif

#include <xercesc/util/Janitor.hpp>
#include <xercesc/util/NullPointerException.hpp>
#include <assert.h>
#include <new>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  RefHash2KeysTableOf: Constructors and Destructor
// ---------------------------------------------------------------------------
template <class TVal>
RefHash2KeysTableOf<TVal>::RefHash2KeysTableOf( const unsigned int   modulus
                                              , const bool           adoptElems
                                              , MemoryManager* const manager)
    : fMemoryManager(manager)
	, fAdoptedElems(adoptElems)
    , fBucketList(0)
    , fHashModulus(modulus)
    , fCount(0)
    , fHash(0)
{
    initialize(modulus);
	
	// create default hasher
	fHash = new (fMemoryManager) HashXMLCh();
}

template <class TVal>
RefHash2KeysTableOf<TVal>::RefHash2KeysTableOf( const unsigned int   modulus
                                              , const bool           adoptElems
                                              , HashBase*            hashBase
                                              , MemoryManager* const manager)
	: fMemoryManager(manager)
    , fAdoptedElems(adoptElems)
    , fBucketList(0)
    , fHashModulus(modulus)
    , fCount(0)
    , fHash(0)
{
	initialize(modulus);
	// set hasher
	fHash = hashBase;
}

template <class TVal>
RefHash2KeysTableOf<TVal>::RefHash2KeysTableOf(const unsigned int modulus,
                                               MemoryManager* const manager)
	: fMemoryManager(manager)
    , fAdoptedElems(true)
    , fBucketList(0)
    , fHashModulus(modulus)
    , fCount(0)
    , fHash(0)
{
	initialize(modulus);

	// create default hasher
	fHash = new (fMemoryManager) HashXMLCh();
}

template <class TVal>
void RefHash2KeysTableOf<TVal>::initialize(const unsigned int modulus)
{
	if (modulus == 0)
        ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::HshTbl_ZeroModulus, fMemoryManager);

    // Allocate the bucket list and zero them
    fBucketList = (RefHash2KeysTableBucketElem<TVal>**) fMemoryManager->allocate
    (
        fHashModulus * sizeof(RefHash2KeysTableBucketElem<TVal>*)
    ); //new RefHash2KeysTableBucketElem<TVal>*[fHashModulus];
    memset(fBucketList, 0, sizeof(fBucketList[0]) * fHashModulus);
}

template <class TVal> RefHash2KeysTableOf<TVal>::~RefHash2KeysTableOf()
{
    removeAll();

    // Then delete the bucket list & hasher
    fMemoryManager->deallocate(fBucketList); //delete [] fBucketList;
	delete fHash;
}


// ---------------------------------------------------------------------------
//  RefHash2KeysTableOf: Element management
// ---------------------------------------------------------------------------
template <class TVal> bool RefHash2KeysTableOf<TVal>::isEmpty() const
{
    return (fCount==0);
}

template <class TVal> bool RefHash2KeysTableOf<TVal>::
containsKey(const void* const key1, const int key2) const
{
    unsigned int hashVal;
    const RefHash2KeysTableBucketElem<TVal>* findIt = findBucketElem(key1, key2, hashVal);
    return (findIt != 0);
}

template <class TVal> void RefHash2KeysTableOf<TVal>::
removeKey(const void* const key1, const int key2)
{
    // Hash the key
    unsigned int hashVal = fHash->getHashVal(key1, fHashModulus);
    assert(hashVal < fHashModulus);

    //
    //  Search the given bucket for this key. Keep up with the previous
    //  element so we can patch around it.
    //
    RefHash2KeysTableBucketElem<TVal>* curElem = fBucketList[hashVal];
    RefHash2KeysTableBucketElem<TVal>* lastElem = 0;

    while (curElem)
    {
        if (fHash->equals(key1, curElem->fKey1) && (key2==curElem->fKey2))
        {
            if (!lastElem)
            {
                // It was the first in the bucket
                fBucketList[hashVal] = curElem->fNext;
            }
            else
            {
                // Patch around the current element
                lastElem->fNext = curElem->fNext;
            }

            // If we adopted the elements, then delete the data
            if (fAdoptedElems)
                delete curElem->fData;

            // Delete the current element
            // delete curElem;
            // destructor is empty...
            // curElem->~RefHash2KeysTableBucketElem();
            fMemoryManager->deallocate(curElem);            
            fCount--;
            return;
        }

        // Move both pointers upwards
        lastElem = curElem;
        curElem = curElem->fNext;
    }

    // We never found that key
    ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager);
}

template <class TVal> void RefHash2KeysTableOf<TVal>::
removeKey(const void* const key1)
{
    // Hash the key
    unsigned int hashVal = fHash->getHashVal(key1, fHashModulus);
    assert(hashVal < fHashModulus);

    //
    //  Search the given bucket for this key. Keep up with the previous
    //  element so we can patch around it.
    //
    RefHash2KeysTableBucketElem<TVal>* curElem = fBucketList[hashVal];
    RefHash2KeysTableBucketElem<TVal>* lastElem = 0;

    while (curElem)
    {
        if (fHash->equals(key1, curElem->fKey1))
        {
            if (!lastElem)
            {
                // It was the first in the bucket
                fBucketList[hashVal] = curElem->fNext;
            }
            else
            {
                // Patch around the current element
                lastElem->fNext = curElem->fNext;
            }

            // If we adopted the elements, then delete the data
            if (fAdoptedElems)
                delete curElem->fData;

            RefHash2KeysTableBucketElem<TVal>* toBeDeleted=curElem;
            curElem = curElem->fNext;

            // Delete the current element
            // delete curElem;
            // destructor is empty...
            // curElem->~RefHash2KeysTableBucketElem();
            fMemoryManager->deallocate(toBeDeleted);
            fCount--;
        }
        else
        {
            // Move both pointers upwards
            lastElem = curElem;
            curElem = curElem->fNext;
        }
    }
}

template <class TVal> void RefHash2KeysTableOf<TVal>::removeAll()
{
    if(isEmpty())
        return;

    // Clean up the buckets first
    for (unsigned int buckInd = 0; buckInd < fHashModulus; buckInd++)
    {
        // Get the bucket list head for this entry
        RefHash2KeysTableBucketElem<TVal>* curElem = fBucketList[buckInd];
        RefHash2KeysTableBucketElem<TVal>* nextElem;
        while (curElem)
        {
            // Save the next element before we hose this one
            nextElem = curElem->fNext;

            // If we adopted the data, then delete it too
            //    (Note:  the userdata hash table instance has data type of void *.
            //    This will generate compiler warnings here on some platforms, but they
            //    can be ignored since fAdoptedElements is false.
            if (fAdoptedElems)
                delete curElem->fData;

            // Then delete the current element and move forward
            // destructor is empty...
            // curElem->~RefHash2KeysTableBucketElem();
            fMemoryManager->deallocate(curElem);
            curElem = nextElem;
        }

        // Clean out this entry
        fBucketList[buckInd] = 0;
    }
    fCount=0;
}

// this function transfer the data from key1 to key2
template <class TVal> void RefHash2KeysTableOf<TVal>::transferElement(const void* const key1, void* key2)
{
    // Hash the key
    unsigned int hashVal = fHash->getHashVal(key1, fHashModulus);
    assert(hashVal < fHashModulus);

    //
    //  Search the given bucket for this key. Keep up with the previous
    //  element so we can patch around it.
    //
    RefHash2KeysTableBucketElem<TVal>* curElem = fBucketList[hashVal];
    RefHash2KeysTableBucketElem<TVal>* lastElem = 0;

    while (curElem)
    {
        // if this element has the same primary key, remove it and add it using the new primary key
        if (fHash->equals(key1, curElem->fKey1))
        {
            if (!lastElem)
            {
                // It was the first in the bucket
                fBucketList[hashVal] = curElem->fNext;
            }
            else
            {
                // Patch around the current element
                lastElem->fNext = curElem->fNext;
            }

            // this code comes from put(), but it doesn't update fCount
            unsigned int hashVal2;
            RefHash2KeysTableBucketElem<TVal>* newBucket = findBucketElem(key2, curElem->fKey2, hashVal2);
            if (newBucket)
            {
                if (fAdoptedElems)
                    delete newBucket->fData;
                newBucket->fData = curElem->fData;
		        newBucket->fKey1 = key2;
		        newBucket->fKey2 = curElem->fKey2;
            }
             else
            {
                newBucket =
                    new (fMemoryManager->allocate(sizeof(RefHash2KeysTableBucketElem<TVal>)))
                    RefHash2KeysTableBucketElem<TVal>(key2, curElem->fKey2, curElem->fData, fBucketList[hashVal2]);
                fBucketList[hashVal2] = newBucket;
            }

            RefHash2KeysTableBucketElem<TVal>* elemToDelete = curElem;
            
            // Update just curElem; lastElem must stay the same
            curElem = curElem->fNext;

            // Delete the current element
            // delete elemToDelete;
            // destructor is empty...
            // curElem->~RefHash2KeysTableBucketElem();
            fMemoryManager->deallocate(elemToDelete);
        }
        else