/*

 * 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: XMLBufferMgr.cpp 673679 2008-07-03 13:50:10Z borisk $

 */

// ---------------------------------------------------------------------------

//  Includes

// ---------------------------------------------------------------------------

//#include <string.h>

#include <xercesc/framework/XMLBufferMgr.hpp>

#include <xercesc/util/RuntimeException.hpp>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------

//  Constructors and Destructor

// ---------------------------------------------------------------------------

XMLBufferMgr::XMLBufferMgr(MemoryManager* const manager) :

    fBufCount(32)

    , fMemoryManager(manager)

    , fBufList(0)

{

    // Allocate the buffer list and zero it out

    fBufList = (XMLBuffer**) fMemoryManager->allocate(fBufCount * sizeof(XMLBuffer*)); // new XMLBuffer*[fBufCount];

    for (XMLSize_t index = 0; index < fBufCount; index++)

        fBufList[index] = 0;

}

XMLBufferMgr::~XMLBufferMgr()

{

    // Delete any buffers that got allocated

    for (XMLSize_t index = 0; index < fBufCount; index++)

        delete fBufList[index];

    // And then the buffer list

    fMemoryManager->deallocate(fBufList); //delete [] fBufList;

}

// ---------------------------------------------------------------------------

//  Buffer management

// ---------------------------------------------------------------------------

XMLBuffer& XMLBufferMgr::bidOnBuffer()

{

    //

    //  Look for a buffer that is not in use. If we hit a null entry, then

    //  we have to add one.

    //

    for (XMLSize_t index = 0; index < fBufCount; index++)

    {

        // No more buffers available, so create one and take it

        if (!fBufList[index])

        {

            fBufList[index] = new (fMemoryManager) XMLBuffer(1023, fMemoryManager);

            fBufList[index]->setInUse(true);

            return *fBufList[index];

        }

        //

        //  There's one here, so see if its use. If not, mark it, reset it,

        //  and take it

        //

        if (!fBufList[index]->getInUse())

        {

            fBufList[index]->reset();

            fBufList[index]->setInUse(true);

            return *(fBufList[index]);

        }

    }

    // We did not find one, so freak out

    ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::BufMgr_NoMoreBuffers, fMemoryManager);

    // NOTE: Dummy return to make some compilers happy. Never really gets called!

    return *fBufList[0];

}

void XMLBufferMgr::releaseBuffer(XMLBuffer& toRelease)

{

    // Look for this buffer in the list

    for (XMLSize_t index = 0; index < fBufCount; index++)

    {

        if (fBufList[index] == &toRelease)

        {

            // Unmark it

            toRelease.setInUse(false);

            return;

        }

    }

    // It was not a legal buffer

    ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::BufMgr_BufferNotInPool, fMemoryManager);

}

XERCES_CPP_NAMESPACE_END