QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator( QgsVectorLayerFeatureSource* source, bool ownSource, const QgsFeatureRequest& request )
: QgsAbstractFeatureIteratorFromSource( source, ownSource, request )
, mEditGeometrySimplifier( 0 )
{
// prepare joins: may add more attributes to fetch (in order to allow join)
if ( mSource->mJoinBuffer->containsJoins() )
prepareJoins();
prepareExpressions();
// by default provider's request is the same
mProviderRequest = mRequest;
if ( mProviderRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
{
// prepare list of attributes to match provider fields
QgsAttributeList providerSubset;
QgsAttributeList subset = mProviderRequest.subsetOfAttributes();
int nPendingFields = mSource->mFields.count();
for ( int i = 0; i < subset.count(); ++i )
{
int attrIndex = subset[i];
if ( attrIndex < 0 || attrIndex >= nPendingFields ) continue;
if ( mSource->mFields.fieldOrigin( attrIndex ) == QgsFields::OriginProvider )
providerSubset << mSource->mFields.fieldOriginIndex( attrIndex );
}
mProviderRequest.setSubsetOfAttributes( providerSubset );
}
if ( mSource->mHasEditBuffer )
{
mChangedFeaturesRequest = mProviderRequest;
mChangedFeaturesRequest.setFilterFids( mSource->mChangedAttributeValues.keys().toSet() );
}
if ( request.filterType() == QgsFeatureRequest::FilterFid )
{
mFetchedFid = false;
}
else // no filter or filter by rect
{
if ( mSource->mHasEditBuffer )
{
mChangedFeaturesIterator = mSource->mProviderFeatureSource->getFeatures( mChangedFeaturesRequest );
}
else
{
mProviderIterator = mSource->mProviderFeatureSource->getFeatures( mProviderRequest );
}
rewindEditBuffer();
}
if ( mRequest.filterType() == QgsFeatureRequest::FilterExpression )
{
mRequest.filterExpression()->prepare( mSource->mFields );
}
}
QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator( QgsVectorLayer* layer, const QgsFeatureRequest& request )
: QgsAbstractFeatureIterator( request ), L( layer )
{
QgsVectorLayerJoinBuffer* joinBuffer = L->mJoinBuffer;
if ( L->editBuffer() )
{
mAddedFeatures = QgsFeatureMap( L->editBuffer()->addedFeatures() );
mChangedGeometries = QgsGeometryMap( L->editBuffer()->changedGeometries() );
mDeletedFeatureIds = QgsFeatureIds( L->editBuffer()->deletedFeatureIds() );
mChangedAttributeValues = QgsChangedAttributesMap( L->editBuffer()->changedAttributeValues() );
mAddedAttributes = QList<QgsField>( L->editBuffer()->addedAttributes() );
mDeletedAttributeIds = QgsAttributeList( L->editBuffer()->deletedAttributeIds() );
}
// prepare joins: may add more attributes to fetch (in order to allow join)
if ( joinBuffer->containsJoins() )
prepareJoins();
// by default provider's request is the same
mProviderRequest = mRequest;
if ( mProviderRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
{
// prepare list of attributes to match provider fields
QgsAttributeList providerSubset;
QgsAttributeList subset = mProviderRequest.subsetOfAttributes();
const QgsFields &pendingFields = L->pendingFields();
int nPendingFields = pendingFields.count();
for ( int i = 0; i < subset.count(); ++i )
{
int attrIndex = subset[i];
if ( attrIndex < 0 || attrIndex >= nPendingFields ) continue;
if ( L->pendingFields().fieldOrigin( attrIndex ) == QgsFields::OriginProvider )
providerSubset << L->pendingFields().fieldOriginIndex( attrIndex );
}
mProviderRequest.setSubsetOfAttributes( providerSubset );
}
if ( request.filterType() == QgsFeatureRequest::FilterFid )
{
mFetchedFid = false;
}
else // no filter or filter by rect
{
mProviderIterator = L->dataProvider()->getFeatures( mProviderRequest );
rewindEditBuffer();
}
}
bool QgsVectorLayerFeatureIterator::rewind()
{
if ( mClosed )
return false;
if ( mRequest.filterType() == QgsFeatureRequest::FilterFid )
{
mFetchedFid = false;
}
else
{
mProviderIterator.rewind();
rewindEditBuffer();
}
return true;
}