QgsCacheIndexFeatureId Class Reference

#include <qgscacheindexfeatureid.h>

Inheritance diagram for QgsCacheIndexFeatureId:

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

Detailed Description

Definition at line 28 of file qgscacheindexfeatureid.h.

Constructor & Destructor Documentation

QgsCacheIndexFeatureId()

QgsCacheIndexFeatureId::QgsCacheIndexFeatureId

(

QgsVectorLayerCache *

cachedVectorLayer

)

Definition at line 21 of file qgscacheindexfeatureid.cpp.

Member Function Documentation

flush()

void QgsCacheIndexFeatureId::flush ( )

overridevirtual

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 32 of file qgscacheindexfeatureid.cpp.

flushFeature()

void QgsCacheIndexFeatureId::flushFeature ( QgsFeatureId  fid )

overridevirtual

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 successfully answer a request.

Implements QgsAbstractCacheIndex.

Definition at line 27 of file qgscacheindexfeatureid.cpp.

getCacheIterator()

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

overridevirtual

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 set the iterator to a valid iterator over the cached features. If it is not able it will return false.

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.

Returns

true, if this index holds the information to answer the request.

Implements QgsAbstractCacheIndex.

Definition at line 42 of file qgscacheindexfeatureid.cpp.

requestCompleted()

void QgsCacheIndexFeatureId::requestCompleted ( const QgsFeatureRequest &  featureRequest, const QgsFeatureIds &  fids  )

overridevirtual

Implement this method to update the the indices, in case you need information contained by the request to properly index.

(E.g. spatial index) Does nothing by default

Parameters

featureRequest	The feature request that was answered
fids	The feature ids that have been returned

Reimplemented from QgsAbstractCacheIndex.

Definition at line 36 of file qgscacheindexfeatureid.cpp.

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

• /build/qgis-3.16.0+99unstable/src/core/qgscacheindexfeatureid.h
• /build/qgis-3.16.0+99unstable/src/core/qgscacheindexfeatureid.cpp