QgsCachedFeatureWriterIterator Class Reference

Uses another iterator as backend and writes features to the cache. More...

#include <qgscachedfeatureiterator.h>

Inheritance diagram for QgsCachedFeatureWriterIterator:

Collaboration diagram for QgsCachedFeatureWriterIterator:

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)

Detailed Description

Uses another iterator as backend and writes features to the cache.

Definition at line 98 of file qgscachedfeatureiterator.h.

Constructor & Destructor Documentation

QgsCachedFeatureWriterIterator::QgsCachedFeatureWriterIterator	(	QgsVectorLayerCache *	vlCache,
		QgsFeatureRequest	featureRequest
	)

This constructor creates a feature iterator, which queries the backend and caches retrieved features.

Parameters

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.

Member Function Documentation

bool QgsCachedFeatureWriterIterator::close ( )

virtual

Close this iterator.

No further features will be available.

Returns

true if successful

Implements QgsAbstractFeatureIterator.

Definition at line 115 of file qgscachedfeatureiterator.cpp.

References QgsFeatureIterator::close(), QgsAbstractFeatureIterator::mClosed, and mFeatIt.

bool QgsCachedFeatureWriterIterator::fetchFeature ( QgsFeature &  f )

protectedvirtual

Implementation for fetching a feature.

Parameters

f	Will write to this feature

Returns

bool true if the operation was ok

See Also

bool getFeature( QgsFeature& f )

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().

bool QgsCachedFeatureWriterIterator::rewind ( )

virtual

Rewind to the beginning of the iterator.

Returns

bool true if the operation was ok

Implements QgsAbstractFeatureIterator.

Definition at line 109 of file qgscachedfeatureiterator.cpp.

References mFeatIt, mFids, and QgsFeatureIterator::rewind().

Member Data Documentation

QgsFeatureIterator QgsCachedFeatureWriterIterator::mFeatIt

private

Definition at line 136 of file qgscachedfeatureiterator.h.

Referenced by close(), fetchFeature(), QgsCachedFeatureWriterIterator(), and rewind().

QgsFeatureIds QgsCachedFeatureWriterIterator::mFids

private

Definition at line 138 of file qgscachedfeatureiterator.h.

Referenced by fetchFeature(), and rewind().

QgsVectorLayerCache* QgsCachedFeatureWriterIterator::mVectorLayerCache

private

Definition at line 137 of file qgscachedfeatureiterator.h.

Referenced by fetchFeature().

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The documentation for this class was generated from the following files:

• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgscachedfeatureiterator.h
• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgscachedfeatureiterator.cpp