Subgroup: Processing

Class: QgsProcessingFeatureSource¶

class qgis.core.QgsProcessingFeatureSource¶

Bases: qgis._core.QgsFeatureSource

QgsFeatureSource subclass which proxies methods to an underlying QgsFeatureSource, modifying results according to the settings in a QgsProcessingContext.

New in version 3.0: Methods

`allFeatureIds`
`createExpressionContextScope`	Returns an expression context scope suitable for this source.
`featureCount`
`fields`
`getFeatures`	Returns an iterator for the features in the source, respecting the supplied feature `flags`.
`materialize`	Materializes a `request` (query) made against this feature source, by running it over the source and returning a new memory based vector layer containing the result.
`maximumValue`
`minimumValue`
`sourceCrs`
`sourceExtent`
`sourceName`
`uniqueValues`
`wkbType`

Attributes

FlagSkipGeometryValidityChecks

class Flag¶: Bases: int

FlagSkipGeometryValidityChecks = 2¶

class Flags¶

Bases: sip.wrapper

QgsProcessingFeatureSource.Flags(Union[QgsProcessingFeatureSource.Flags, QgsProcessingFeatureSource.Flag]) QgsProcessingFeatureSource.Flags(QgsProcessingFeatureSource.Flags)

allFeatureIds(self) → object¶

createExpressionContextScope(self) → QgsExpressionContextScope¶: Returns an expression context scope suitable for this source.

featureCount(self) → int¶

fields(self) → QgsFields¶

getFeatures(self, request: QgsFeatureRequest, flags: Union[QgsProcessingFeatureSource.Flags, QgsProcessingFeatureSource.Flag]) → QgsFeatureIterator¶

Returns an iterator for the features in the source, respecting the supplied feature flags. An optional request can be used to optimise the returned iterator, eg by restricting the returned attributes or geometry.

getFeatures(self, request: QgsFeatureRequest = QgsFeatureRequest()) -> QgsFeatureIterator

maximumValue(self, fieldIndex: int) → Any¶

minimumValue(self, fieldIndex: int) → Any¶

sourceCrs(self) → QgsCoordinateReferenceSystem¶

sourceExtent(self) → QgsRectangle¶

sourceName(self) → str¶

uniqueValues(self, fieldIndex: int, limit: int = -1) → Set[Any]¶

wkbType(self) → QgsWkbTypes.Type¶