/**********************************************************************
* TABSeamless::OpenBaseTable()
*
* Open the base table for specified IndexFeature.
*
* Returns 0 on success, -1 on error.
**********************************************************************/
int TABSeamless::OpenBaseTable(int nTableId, GBool bTestOpenNoError /*=FALSE*/)
{
if (nTableId == -1)
{
// Open first table from dataset
m_poIndexTable->ResetReading();
if (OpenNextBaseTable(bTestOpenNoError) != 0)
{
// Open Failed... an error has already been reported.
if (bTestOpenNoError)
CPLErrorReset();
return -1;
}
}
else if (nTableId == m_nCurBaseTableId && m_poCurBaseTable != NULL)
{
// The right table is already opened. Not much to do!
m_poCurBaseTable->ResetReading();
return 0;
}
else
{
TABFeature *poIndexFeature = m_poIndexTable->GetFeatureRef(nTableId);
if (poIndexFeature)
{
if (OpenBaseTable(poIndexFeature, bTestOpenNoError) != 0)
{
// Open Failed... an error has already been reported.
if (bTestOpenNoError)
CPLErrorReset();
return -1;
}
}
}
return 0;
}
/**********************************************************************
* TABSeamless::GetNextFeatureId()
*
* Returns feature id that follows nPrevId, or -1 if it is the
* last feature id. Pass nPrevId=-1 to fetch the first valid feature id.
**********************************************************************/
GIntBig TABSeamless::GetNextFeatureId(GIntBig nPrevId)
{
if (m_poIndexTable == nullptr)
return -1; // File is not opened yet
if (nPrevId == -1 || m_nCurBaseTableId != ExtractBaseTableId(nPrevId))
{
if (OpenBaseTable(ExtractBaseTableId(nPrevId)) != 0)
return -1;
}
int nId = ExtractBaseFeatureId(nPrevId);
do
{
nId = (int) m_poCurBaseTable->GetNextFeatureId(nId);
if (nId != -1)
return EncodeFeatureId(m_nCurBaseTableId, nId); // Found one!
else
OpenNextBaseTable(); // Skip to next tile and loop again
} while (nId == -1 && !m_bEOF && m_poCurBaseTable);
return -1;
}
