#include <qgscacheindexfeatureid.h>

Inheritance diagram for QgsCacheIndexFeatureId:

Collaboration diagram for QgsCacheIndexFeatureId:

Public Member Functions
	QgsCacheIndexFeatureId (QgsVectorLayerCache *)
virtual void	flushFeature (const QgsFeatureId fid)
	Is called, whenever a feature is removed from the cache.
virtual void	flush ()
	Sometimes, the whole cache changes its state and its easier to just withdraw everything.
virtual void	requestCompleted (QgsFeatureRequest featureRequest, QgsFeatureIds fids)
	Implement this method to update the the indices, in case you need information contained by the request to properly index.
virtual bool	getCacheIterator (QgsFeatureIterator &featureIterator, const QgsFeatureRequest &featureRequest)
	Is called, when a feature request is issued on a cached layer.
Public Member Functions inherited from QgsAbstractCacheIndex
	QgsAbstractCacheIndex ()
virtual	~QgsAbstractCacheIndex ()

Private Attributes
QgsVectorLayerCache *	C

Detailed Description

Definition at line 23 of file qgscacheindexfeatureid.h.

Constructor & Destructor Documentation

QgsCacheIndexFeatureId::QgsCacheIndexFeatureId ( QgsVectorLayerCache * cachedVectorLayer )

Definition at line 21 of file qgscacheindexfeatureid.cpp.

Member Function Documentation

void QgsCacheIndexFeatureId::flush ( )

virtual

Sometimes, the whole cache changes its state and its easier to just withdraw everything.

In this case, this method is issued. Be sure to clear all cache information in here.

Implements QgsAbstractCacheIndex.

Definition at line 33 of file qgscacheindexfeatureid.cpp.

void QgsCacheIndexFeatureId::flushFeature ( const QgsFeatureId fid )

virtual

Is called, whenever a feature is removed from the cache.

You should update your indexes, so they become invalid in case this feature was required to successfuly answer a request.

Implements QgsAbstractCacheIndex.

Definition at line 28 of file qgscacheindexfeatureid.cpp.

bool QgsCacheIndexFeatureId::getCacheIterator	(	QgsFeatureIterator &	featureIterator,
		const QgsFeatureRequest &	featureRequest
	)

virtual

Is called, when a feature request is issued on a cached layer.

If this cache index is able to completely answer the feature request, it will return true and write the list of feature ids of cached features to cachedFeatures. If it is not able it will return false and the cachedFeatures state is undefined.

Parameters

featureIterator	A reference to a QgsFeatureIterator. A valid featureIterator will be assigned in case this index is able to answer the request and the return value is true.
featureRequest	The feature request, for which this index is queried.