/**********************************************************************
* TABSeamless::GetFeatureRef()
*
* Fill and return a TABFeature object for the specified feature id.
*
* The returned pointer is a reference to an object owned and maintained
* by this TABSeamless object. It should not be altered or freed by the
* caller and its contents is guaranteed to be valid only until the next
* call to GetFeatureRef() or Close().
*
* Returns NULL if the specified feature id does not exist of if an
* error happened. In any case, CPLError() will have been called to
* report the reason of the failure.
**********************************************************************/
TABFeature *TABSeamless::GetFeatureRef(int nFeatureId)
{
if (m_poIndexTable == NULL)
return NULL; // File is not opened yet
if (nFeatureId == m_nCurFeatureId && m_poCurFeature)
return m_poCurFeature;
if (m_nCurBaseTableId != ExtractBaseTableId(nFeatureId))
{
if (OpenBaseTable(ExtractBaseTableId(nFeatureId)) != 0)
return NULL;
}
if (m_poCurBaseTable)
{
if (m_poCurFeature)
delete m_poCurFeature;
m_poCurFeature = (TABFeature*)m_poCurBaseTable->GetFeature(ExtractBaseFeatureId(nFeatureId));
m_nCurFeatureId = nFeatureId;
m_poCurFeature->SetFID(nFeatureId);
return m_poCurFeature;
}
return NULL;
}
/**********************************************************************
* 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;
}
/**********************************************************************
* TABSeamless::GetFeatureRef()
*
* Fill and return a TABFeature object for the specified feature id.
*
* The returned pointer is a reference to an object owned and maintained
* by this TABSeamless object. It should not be altered or freed by the
* caller and its contents is guaranteed to be valid only until the next
* call to GetFeatureRef() or Close().
*
* Returns NULL if the specified feature id does not exist of if an
* error happened. In any case, CPLError() will have been called to
* report the reason of the failure.
**********************************************************************/
TABFeature *TABSeamless::GetFeatureRef(GIntBig nFeatureId)
{
if (m_poIndexTable == nullptr)
return nullptr; // File is not opened yet
if (nFeatureId == m_nCurFeatureId && m_poCurFeature)
return m_poCurFeature;
if (m_nCurBaseTableId != ExtractBaseTableId(nFeatureId))
{
if (OpenBaseTable(ExtractBaseTableId(nFeatureId)) != 0)
return nullptr;
}
if (m_poCurBaseTable)
{
if (m_poCurFeature)
delete m_poCurFeature;
m_poCurFeature = nullptr;
TABFeature* poCurFeature = (TABFeature*)m_poCurBaseTable->GetFeature(ExtractBaseFeatureId(nFeatureId));
if( poCurFeature == nullptr )
return nullptr;
m_poCurFeature = new TABFeature(m_poFeatureDefnRef);
m_poCurFeature->SetFrom(poCurFeature);
delete poCurFeature;
m_nCurFeatureId = nFeatureId;
m_poCurFeature->SetFID(nFeatureId);
return m_poCurFeature;
}
return nullptr;
}
