OGRFeature *OGROGDILayer::GetFeature( GIntBig nFeatureId )
{
ecs_Result *psResult;
if (m_nTotalShapeCount != -1 && nFeatureId > m_nTotalShapeCount)
return NULL;
/* Unset spatial filter */
OGRGeometry* poOldFilterGeom = ( m_poFilterGeom != NULL ) ? m_poFilterGeom->clone() : NULL;
if( poOldFilterGeom != NULL )
SetSpatialFilter(NULL);
/* Reset reading if we are not the current layer */
/* WARNING : this does not allow interleaved reading of layers */
if( m_poODS->GetCurrentLayer() != this )
{
m_poODS->SetCurrentLayer(this);
ResetReading();
}
else if ( nFeatureId < m_iNextShapeId )
ResetReading();
while(m_iNextShapeId != nFeatureId)
{
psResult = cln_GetNextObject(m_nClientID);
if (ECSSUCCESS(psResult))
m_iNextShapeId++;
else
{
// We probably reached EOF... keep track of shape count.
m_nTotalShapeCount = m_iNextShapeId;
if( poOldFilterGeom != NULL )
{
SetSpatialFilter(poOldFilterGeom);
delete poOldFilterGeom;
}
return NULL;
}
}
// OK, we're ready to read the requested feature...
OGRFeature* poFeature = GetNextRawFeature();
if( poOldFilterGeom != NULL )
{
SetSpatialFilter(poOldFilterGeom);
delete poOldFilterGeom;
}
return poFeature;
}
OGRFeature *OGRUnionLayer::GetFeature( GIntBig nFeatureId )
{
OGRFeature* poFeature = NULL;
if( !bPreserveSrcFID )
{
poFeature = OGRLayer::GetFeature(nFeatureId);
}
else
{
int iGeomFieldFilterSave = m_iGeomFieldFilter;
OGRGeometry* poGeomSave = m_poFilterGeom;
m_poFilterGeom = NULL;
SetSpatialFilter(NULL);
for(int i=0;i<nSrcLayers;i++)
{
iCurLayer = i;
ConfigureActiveLayer();
OGRFeature* poSrcFeature = papoSrcLayers[i]->GetFeature(nFeatureId);
if( poSrcFeature != NULL )
{
poFeature = TranslateFromSrcLayer(poSrcFeature);
delete poSrcFeature;
break;
}
}
SetSpatialFilter(iGeomFieldFilterSave, poGeomSave);
delete poGeomSave;
ResetReading();
}
return poFeature;
}
void OGRLayer::SetSpatialFilterRect( double dfMinX, double dfMinY,
double dfMaxX, double dfMaxY )
{
OGRLinearRing oRing;
OGRPolygon oPoly;
oRing.addPoint( dfMinX, dfMinY );
oRing.addPoint( dfMinX, dfMaxY );
oRing.addPoint( dfMaxX, dfMaxY );
oRing.addPoint( dfMaxX, dfMinY );
oRing.addPoint( dfMinX, dfMinY );
oPoly.addRing( &oRing );
SetSpatialFilter( &oPoly );
}
void OGRUnionLayer::SetSpatialFilter( OGRGeometry * poGeomIn )
{
SetSpatialFilter(0, poGeomIn);
}
void OGRWarpedLayer::SetSpatialFilter( OGRGeometry * poGeom )
{
SetSpatialFilter( 0, poGeom );
}