mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-26 00:02:08 -05:00
c49b5b777f
Rationale: - there was a lot of large objects passed by value, so potentially there's a speed bump from this - even for implicitly shared classes like QString/QList there's still a (small) cost for copying the objects when there's no reason to - it's the right thing to do!
109 lines
3.2 KiB
Plaintext
109 lines
3.2 KiB
Plaintext
class QgsCachedFeatureIterator : QgsAbstractFeatureIterator
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{
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%TypeHeaderCode
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#include <qgscachedfeatureiterator.h>
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%End
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public:
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/**
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* This constructor creates a feature iterator, that delivers only cached information, based on the
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* @link QgsFeatureIds @endlink. No request is made to the backend.
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*
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* @param vlCache The vector layer cache to use
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* @param featureRequest The feature request to answer
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* @param featureIds The feature ids to return
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*
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* @deprecated Use QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, QgsFeatureRequest featureRequest )
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* instead
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*/
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QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, const QgsFeatureRequest& featureRequest, const QgsFeatureIds& featureIds );
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/**
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* This constructor creates a feature iterator, that delivers all cached features. No request is made to the backend.
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*
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* @param vlCache The vector layer cache to use
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* @param featureRequest The feature request to answer
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*/
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QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, const QgsFeatureRequest& featureRequest );
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/**
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* Rewind to the beginning of the iterator
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*
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* @return bool true if the operation was ok
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*/
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virtual bool rewind();
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/**
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* Close this iterator. No further features will be available.
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*
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* @return true if successful
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*/
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virtual bool close();
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// QgsAbstractFeatureIterator interface
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protected:
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/**
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* Implementation for fetching a feature.
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*
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* @param f Will write to this feature
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* @return bool true if the operation was ok
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*
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* @see bool getFeature( QgsFeature& f )
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*/
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virtual bool fetchFeature( QgsFeature& f );
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/**
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* We have a local special iterator for FilterFids, no need to run the generic.
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*
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* @param f Will write to this feature
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* @return bool true if the operation was ok
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*/
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virtual bool nextFeatureFilterFids( QgsFeature& f );
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};
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/**
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* @brief
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* Uses another iterator as backend and writes features to the cache
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*
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*/
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class QgsCachedFeatureWriterIterator : QgsAbstractFeatureIterator
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{
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%TypeHeaderCode
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#include <qgscachedfeatureiterator.h>
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%End
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public:
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/**
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* This constructor creates a feature iterator, which queries the backend and caches retrieved features.
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*
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* @param vlCache The vector layer cache to use
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* @param featureRequest The feature request to answer
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*/
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QgsCachedFeatureWriterIterator( QgsVectorLayerCache* vlCache, const QgsFeatureRequest& featureRequest );
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/**
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* Rewind to the beginning of the iterator
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*
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* @return bool true if the operation was ok
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*/
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virtual bool rewind();
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/**
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* Close this iterator. No further features will be available.
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*
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* @return true if successful
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*/
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virtual bool close();
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protected:
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/**
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* Implementation for fetching a feature.
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*
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* @param f Will write to this feature
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* @return bool true if the operation was ok
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*
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* @see bool getFeature( QgsFeature& f )
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*/
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virtual bool fetchFeature( QgsFeature& f );
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};
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