DataStream.cc

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/******************************************************************************
 * Project:  libsidx - A C API wrapper around libspatialindex
 * Purpose:  C++ objects to implement the datastream.
 * Author:   Howard Butler, hobu.inc@gmail.com
 ******************************************************************************
 * Copyright (c) 2009, Howard Butler
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
******************************************************************************/
 
#include <spatialindex/capi/sidx_impl.h>
 
 
DataStream::DataStream(int (*readNext)(SpatialIndex::id_type * id,
                       double **pMin,
                       double **pMax,
                       uint32_t *nDimension,
                       const uint8_t** pData,
                       size_t *nDataLength) )
  : m_pNext(0),
    m_bDoneReading(false)
{
    iterfunct = readNext;
 
    // Read the first one.
    readData();
}
 
DataStream::~DataStream()
{
    if (m_pNext != 0) delete m_pNext;
}
 
bool DataStream::readData()
{
    SpatialIndex::id_type id;
    double *pMin=0;
    double *pMax=0;
    uint32_t nDimension=0;
    uint8_t *p_data=0;
    size_t nDataLength=0;
 
    if (m_bDoneReading == true) {
        return false;
    }
 
    int ret = iterfunct(&id, &pMin, &pMax, &nDimension, const_cast<const uint8_t**>(&p_data), &nDataLength);
 
    // The callback should return anything other than 0
    // when it is done.
    if (ret != 0)
    {
        m_bDoneReading = true;
        return false;
    }
 
    SpatialIndex::Region r = SpatialIndex::Region(pMin, pMax, nDimension);
 
    // Data gets copied here anyway. We should fix this part of SpatialIndex::RTree::Data's constructor
    m_pNext = new SpatialIndex::RTree::Data((uint32_t)nDataLength, p_data, r, id);
 
    return true;
}
 
 
SpatialIndex::IData* DataStream::getNext()
{
    if (m_pNext == 0) return 0;
 
    SpatialIndex::RTree::Data* ret = m_pNext;
    m_pNext = 0;
    readData();
    return ret;
}
 
bool DataStream::hasNext()
{
    return (m_pNext != 0);
}
 
uint32_t DataStream::size()
{
    throw Tools::NotSupportedException("Operation not supported.");
}
 
void DataStream::rewind()
{
    throw Tools::NotSupportedException("Operation not supported.");
 
/*  if (m_pNext != 0)
    {
     delete m_pNext;
     m_pNext = 0;
    }
*/
}