QGIS API Documentation
2.2.0-Valmiera
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Uses another iterator as backend and writes features to the cache. More...
#include <qgscachedfeatureiterator.h>
Public Member Functions | |
QgsCachedFeatureWriterIterator (QgsVectorLayerCache *vlCache, QgsFeatureRequest featureRequest) | |
This constructor creates a feature iterator, which queries the backend and caches retrieved features. | |
virtual bool | rewind () |
Rewind to the beginning of the iterator. | |
virtual bool | close () |
Close this iterator. | |
Public Member Functions inherited from QgsAbstractFeatureIterator | |
QgsAbstractFeatureIterator (const QgsFeatureRequest &request) | |
base class constructor - stores the iteration parameters | |
virtual | ~QgsAbstractFeatureIterator () |
destructor makes sure that the iterator is closed properly | |
virtual bool | nextFeature (QgsFeature &f) |
fetch next feature, return true on success |
Protected Member Functions | |
virtual bool | fetchFeature (QgsFeature &f) |
Implementation for fetching a feature. | |
Protected Member Functions inherited from QgsAbstractFeatureIterator | |
virtual bool | nextFeatureFilterExpression (QgsFeature &f) |
By default, the iterator will fetch all features and check if the feature matches the expression. | |
virtual bool | nextFeatureFilterFids (QgsFeature &f) |
By default, the iterator will fetch all features and check if the id is in the request. | |
void | ref () |
add reference | |
void | deref () |
remove reference, delete if refs == 0 | |
virtual bool | prepareSimplification (const QgsSimplifyMethod &simplifyMethod) |
Setup the simplification of geometries to fetch using the specified simplify method. |
Private Attributes | |
QgsFeatureIterator | mFeatIt |
QgsVectorLayerCache * | mVectorLayerCache |
QgsFeatureIds | mFids |
Additional Inherited Members | |
Protected Attributes inherited from QgsAbstractFeatureIterator | |
QgsFeatureRequest | mRequest |
A copy of the feature request. | |
bool | mClosed |
Set to true, as soon as the iterator is closed. | |
int | refs |
reference counting (to allow seamless copying of QgsFeatureIterator instances) |
Uses another iterator as backend and writes features to the cache.
Definition at line 98 of file qgscachedfeatureiterator.h.
QgsCachedFeatureWriterIterator::QgsCachedFeatureWriterIterator | ( | QgsVectorLayerCache * | vlCache, |
QgsFeatureRequest | featureRequest | ||
) |
This constructor creates a feature iterator, which queries the backend and caches retrieved features.
vlCache | The vector layer cache to use |
featureRequest | The feature request to answer |
Definition at line 84 of file qgscachedfeatureiterator.cpp.
References QgsVectorLayer::getFeatures(), QgsVectorLayerCache::layer(), and mFeatIt.
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virtual |
Close this iterator.
No further features will be available.
Implements QgsAbstractFeatureIterator.
Definition at line 115 of file qgscachedfeatureiterator.cpp.
References QgsFeatureIterator::close(), QgsAbstractFeatureIterator::mClosed, and mFeatIt.
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protectedvirtual |
Implementation for fetching a feature.
f | Will write to this feature |
Implements QgsAbstractFeatureIterator.
Definition at line 91 of file qgscachedfeatureiterator.cpp.
References QgsVectorLayerCache::cacheFeature(), QgsFeature::id(), mFeatIt, mFids, QgsAbstractFeatureIterator::mRequest, mVectorLayerCache, QgsFeatureIterator::nextFeature(), and QgsVectorLayerCache::requestCompleted().
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virtual |
Rewind to the beginning of the iterator.
Implements QgsAbstractFeatureIterator.
Definition at line 109 of file qgscachedfeatureiterator.cpp.
References mFeatIt, mFids, and QgsFeatureIterator::rewind().
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private |
Definition at line 136 of file qgscachedfeatureiterator.h.
Referenced by close(), fetchFeature(), QgsCachedFeatureWriterIterator(), and rewind().
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private |
Definition at line 138 of file qgscachedfeatureiterator.h.
Referenced by fetchFeature(), and rewind().
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private |
Definition at line 137 of file qgscachedfeatureiterator.h.
Referenced by fetchFeature().