#include <qgsvectorlayerfeatureiterator.h>

Inheritance diagram for QgsVectorLayerFeatureIterator:

Classes
struct	FetchJoinInfo
	Join information prepared for fast attribute id mapping in QgsVectorLayerJoinBuffer::updateFeatureAttributes(). More...

Public Member Functions
	QgsVectorLayerFeatureIterator (QgsVectorLayerFeatureSource *source, bool ownSource, const QgsFeatureRequest &request)

	~QgsVectorLayerFeatureIterator ()

virtual bool	close () override
	end of iterating: free the resources / lock More...

virtual bool	rewind () override
	reset the iterator to the starting position More...

virtual void	setInterruptionChecker (QgsInterruptionChecker *interruptionChecker) override
	Attach an object that can be queried regularly by the iterator to check if it must stopped. More...

Public Member Functions inherited from QgsAbstractFeatureIteratorFromSource< QgsVectorLayerFeatureSource >
	QgsAbstractFeatureIteratorFromSource (QgsVectorLayerFeatureSource *source, bool ownSource, const QgsFeatureRequest &request)

	~QgsAbstractFeatureIteratorFromSource ()

Public Member Functions inherited from QgsAbstractFeatureIterator
	QgsAbstractFeatureIterator (const QgsFeatureRequest &request)
	base class constructor - stores the iteration parameters More...

virtual	~QgsAbstractFeatureIterator ()
	destructor makes sure that the iterator is closed properly More...

CompileStatus	compileStatus () const
	Returns the status of expression compilation for filter expression requests. More...

virtual bool	nextFeature (QgsFeature &f)
	fetch next feature, return true on success More...

Protected Member Functions
void	addExpressionAttribute (QgsFeature &f, int attrIndex)
	Adds an expression based attribute to a feature. More...

void	addJoinedAttributes (QgsFeature &f)

void	addVirtualAttributes (QgsFeature &f)
	Adds attributes that don't source from the provider but are added inside QGIS Includes. More...

virtual bool	fetchFeature (QgsFeature &feature) override
	fetch next feature, return true on success More...

bool	fetchNextAddedFeature (QgsFeature &f)

bool	fetchNextChangedAttributeFeature (QgsFeature &f)

bool	fetchNextChangedGeomFeature (QgsFeature &f)

bool	nextFeatureFid (QgsFeature &f)

virtual bool	nextFeatureFilterExpression (QgsFeature &f) override
	Overrides default method as we only need to filter features in the edit buffer while for others filtering is left to the provider implementation. More...

void	prepareExpression (int fieldIdx)

void	prepareField (int fieldIdx)

void	prepareFields ()

void	prepareJoin (int fieldIdx)

virtual bool	prepareSimplification (const QgsSimplifyMethod &simplifyMethod) override
	Setup the simplification of geometries to fetch using the specified simplify method. More...

void	rewindEditBuffer ()

void	updateChangedAttributes (QgsFeature &f)
	Update feature with uncommited attribute updates. More...

void	updateFeatureGeometry (QgsFeature &f)
	Update feature with uncommited geometry updates. More...

void	useAddedFeature (const QgsFeature &src, QgsFeature &f)

void	useChangedAttributeFeature (QgsFeatureId fid, const QgsGeometry &geom, QgsFeature &f)

Protected Member Functions inherited from QgsAbstractFeatureIteratorFromSource< QgsVectorLayerFeatureSource >
void	iteratorClosed ()
	to be called by from subclass in close() More...

Protected Member Functions inherited from QgsAbstractFeatureIterator
void	deref ()
	remove reference, delete if refs == 0 More...

virtual bool	nextFeatureFilterFids (QgsFeature &f)
	By default, the iterator will fetch all features and check if the id is in the request. More...

void	ref ()
	add reference More...

Protected Attributes
QgsFeatureIterator	mChangedFeaturesIterator

QgsFeatureRequest	mChangedFeaturesRequest

QMap< int, QgsExpression * >	mExpressionFieldInfo

QgsFeatureMap::ConstIterator	mFetchAddedFeaturesIt

QgsGeometryMap::ConstIterator	mFetchChangedGeomIt

QSet< QgsFeatureId >	mFetchConsidered

bool	mFetchedFid

QMap< const QgsVectorJoinInfo *, FetchJoinInfo >	mFetchJoinInfo
	Information about joins used in the current select() statement. More...

bool	mHasVirtualAttributes

QgsFeatureIterator	mProviderIterator

QgsFeatureRequest	mProviderRequest

Protected Attributes inherited from QgsAbstractFeatureIteratorFromSource< QgsVectorLayerFeatureSource >
bool	mOwnSource

QgsVectorLayerFeatureSource *	mSource

Protected Attributes inherited from QgsAbstractFeatureIterator
bool	mClosed
	Set to true, as soon as the iterator is closed. More...

CompileStatus	mCompileStatus
	Status of compilation of filter expression. More...

long	mFetchedCount
	Number of features already fetched by iterator. More...

QgsFeatureRequest	mRequest
	A copy of the feature request. More...

bool	mZombie
	A feature iterator may be closed already but still be serving features from the cache. More...

int	refs
	reference counting (to allow seamless copying of QgsFeatureIterator instances) TODO QGIS3: make this private More...

Additional Inherited Members
Public Types inherited from QgsAbstractFeatureIterator
enum	CompileStatus { NoCompilation, PartiallyCompiled, Compiled }
	Status of expression compilation for filter expression requests. More...

Detailed Description

Definition at line 74 of file qgsvectorlayerfeatureiterator.h.

Constructor & Destructor Documentation

◆ QgsVectorLayerFeatureIterator()

QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator	(	QgsVectorLayerFeatureSource *	source,
		bool	ownSource,
		const QgsFeatureRequest &	request
	)

Definition at line 95 of file qgsvectorlayerfeatureiterator.cpp.

◆ ~QgsVectorLayerFeatureIterator()

QgsVectorLayerFeatureIterator::~QgsVectorLayerFeatureIterator ( )

Definition at line 229 of file qgsvectorlayerfeatureiterator.cpp.

Member Function Documentation

◆ addExpressionAttribute()

void QgsVectorLayerFeatureIterator::addExpressionAttribute	(	QgsFeature &	f,
		int	attrIndex
	)

protected

Adds an expression based attribute to a feature.

Parameters

f	feature
attrIndex	attribute index

Note: added in QGIS 2.14; not available in Python bindings

Definition at line 692 of file qgsvectorlayerfeatureiterator.cpp.

◆ addJoinedAttributes()

void QgsVectorLayerFeatureIterator::addJoinedAttributes ( QgsFeature & f )

protected

Note: not available in Python bindings

Definition at line 632 of file qgsvectorlayerfeatureiterator.cpp.

◆ addVirtualAttributes()

void QgsVectorLayerFeatureIterator::addVirtualAttributes ( QgsFeature & f )

protected

Adds attributes that don't source from the provider but are added inside QGIS Includes.

Joined fields
Expression fields

Parameters

f	The feature will be modified

Note: not available in Python bindings

Definition at line 652 of file qgsvectorlayerfeatureiterator.cpp.

◆ close()

bool QgsVectorLayerFeatureIterator::close ( )

overridevirtual

end of iterating: free the resources / lock

Implements QgsAbstractFeatureIterator.

Definition at line 342 of file qgsvectorlayerfeatureiterator.cpp.

◆ fetchFeature()

bool QgsVectorLayerFeatureIterator::fetchFeature ( QgsFeature & feature )

overrideprotectedvirtual

fetch next feature, return true on success

Implements QgsAbstractFeatureIterator.

Definition at line 238 of file qgsvectorlayerfeatureiterator.cpp.

◆ fetchNextAddedFeature()

bool QgsVectorLayerFeatureIterator::fetchNextAddedFeature ( QgsFeature & f )

protected

Note: not available in Python bindings

Definition at line 361 of file qgsvectorlayerfeatureiterator.cpp.

◆ fetchNextChangedAttributeFeature()

bool QgsVectorLayerFeatureIterator::fetchNextChangedAttributeFeature ( QgsFeature & f )

protected

Note: not available in Python bindings

Definition at line 433 of file qgsvectorlayerfeatureiterator.cpp.

◆ fetchNextChangedGeomFeature()

bool QgsVectorLayerFeatureIterator::fetchNextChangedGeomFeature ( QgsFeature & f )

protected

Note: not available in Python bindings

Definition at line 406 of file qgsvectorlayerfeatureiterator.cpp.

◆ nextFeatureFid()

bool QgsVectorLayerFeatureIterator::nextFeatureFid ( QgsFeature & f )

protected

Note: not available in Python bindings

Definition at line 815 of file qgsvectorlayerfeatureiterator.cpp.

◆ nextFeatureFilterExpression()

virtual bool QgsVectorLayerFeatureIterator::nextFeatureFilterExpression ( QgsFeature & f )

inlineoverrideprotectedvirtual

Overrides default method as we only need to filter features in the edit buffer while for others filtering is left to the provider implementation.

Reimplemented from QgsAbstractFeatureIterator.

Definition at line 95 of file qgsvectorlayerfeatureiterator.h.

◆ prepareExpression()

void QgsVectorLayerFeatureIterator::prepareExpression ( int fieldIdx )

protected

Note: not available in Python bindings

Definition at line 550 of file qgsvectorlayerfeatureiterator.cpp.

◆ prepareField()

void QgsVectorLayerFeatureIterator::prepareField ( int fieldIdx )

protected

Note: not available in Python bindings

Definition at line 610 of file qgsvectorlayerfeatureiterator.cpp.

◆ prepareFields()

void QgsVectorLayerFeatureIterator::prepareFields ( )

protected

Note: not available in Python bindings

Definition at line 586 of file qgsvectorlayerfeatureiterator.cpp.

◆ prepareJoin()

void QgsVectorLayerFeatureIterator::prepareJoin ( int fieldIdx )

protected

Note: not available in Python bindings

Definition at line 504 of file qgsvectorlayerfeatureiterator.cpp.

◆ prepareSimplification()

bool QgsVectorLayerFeatureIterator::prepareSimplification ( const QgsSimplifyMethod & simplifyMethod )

overrideprotectedvirtual

Setup the simplification of geometries to fetch using the specified simplify method.

Reimplemented from QgsAbstractFeatureIterator.

Definition at line 701 of file qgsvectorlayerfeatureiterator.cpp.

◆ rewind()

bool QgsVectorLayerFeatureIterator::rewind ( )

overridevirtual

reset the iterator to the starting position

Implements QgsAbstractFeatureIterator.

Definition at line 324 of file qgsvectorlayerfeatureiterator.cpp.

◆ rewindEditBuffer()

void QgsVectorLayerFeatureIterator::rewindEditBuffer ( )

protected

Note: not available in Python bindings

Definition at line 496 of file qgsvectorlayerfeatureiterator.cpp.

◆ setInterruptionChecker()

void QgsVectorLayerFeatureIterator::setInterruptionChecker ( QgsInterruptionChecker * interruptionChecker )

overridevirtual

Attach an object that can be queried regularly by the iterator to check if it must stopped.

This is mostly useful for iterators where a single nextFeature()/fetchFeature() iteration might be very long. A typical use case is the WFS provider. When nextFeature()/fetchFeature() is reasonably fast, it is not necessary to implement this method. The default implementation does nothing.