bool QgsOgrFeatureIterator::fetchFeature( QgsFeature& feature )
{
feature.setValid( false );
if ( mClosed || !ogrLayer )
return false;
if ( mRequest.filterType() == QgsFeatureRequest::FilterFid )
{
bool result = fetchFeatureWithId( mRequest.filterFid(), feature );
close(); // the feature has been read or was not found: we have finished here
return result;
}
else if ( mRequest.filterType() == QgsFeatureRequest::FilterFids )
{
while ( mFilterFidsIt != mFilterFids.constEnd() )
{
QgsFeatureId nextId = *mFilterFidsIt;
mFilterFidsIt++;
if ( fetchFeatureWithId( nextId, feature ) )
return true;
}
close();
return false;
}
OGRFeatureH fet;
while (( fet = OGR_L_GetNextFeature( ogrLayer ) ) )
{
if ( !readFeature( fet, feature ) )
continue;
else
OGR_F_Destroy( fet );
if ( !mRequest.filterRect().isNull() && !feature.hasGeometry() )
continue;
// we have a feature, end this cycle
feature.setValid( true );
return true;
} // while
close();
return false;
}
bool QgsOgrFeatureIterator::fetchFeature( QgsFeature &feature )
{
QMutexLocker locker( mSharedDS ? &mSharedDS->mutex() : nullptr );
feature.setValid( false );
if ( mClosed || !mOgrLayer )
return false;
if ( mRequest.filterType() == QgsFeatureRequest::FilterFid )
{
bool result = fetchFeatureWithId( mRequest.filterFid(), feature );
close(); // the feature has been read or was not found: we have finished here
return result;
}
else if ( mRequest.filterType() == QgsFeatureRequest::FilterFids )
{
while ( mFilterFidsIt != mFilterFids.end() )
{
QgsFeatureId nextId = *mFilterFidsIt;
++mFilterFidsIt;
if ( fetchFeatureWithId( nextId, feature ) )
return true;
}
close();
return false;
}
gdal::ogr_feature_unique_ptr fet;
// OSM layers (especially large ones) need the GDALDataset::GetNextFeature() call rather than OGRLayer::GetNextFeature()
// see more details here: https://trac.osgeo.org/gdal/wiki/rfc66_randomlayerreadwrite
#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(2,2,0)
if ( !QgsOgrProviderUtils::canDriverShareSameDatasetAmongLayers( mSource->mDriverName ) )
{
OGRLayerH nextFeatureBelongingLayer;
while ( fet.reset( GDALDatasetGetNextFeature( mConn->ds, &nextFeatureBelongingLayer, nullptr, nullptr, nullptr ) ), fet )
{
if ( nextFeatureBelongingLayer == mOgrLayer && checkFeature( fet, feature ) )
{
return true;
}
}
}
else
#endif
{
while ( fet.reset( OGR_L_GetNextFeature( mOgrLayer ) ), fet )
{
if ( checkFeature( fet, feature ) )
{
return true;
}
}
}
close();
return false;
}
