A collection of utilities for working with parameters when running a processing algorithm. More...

#include <qgsprocessingparameters.h>

Static Public Member Functions
static QString	descriptionFromName (const QString &name)
	Creates an autogenerated parameter description from a parameter name. More...

static bool	isDynamic (const QVariantMap &parameters, const QString &name)
	Returns `true` if the parameter with matching name is a dynamic parameter, and must be evaluated once for every input feature processed. More...

static bool	parameterAsBool (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a static boolean value. More...

static bool	parameterAsBool (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a static boolean value. More...

static bool	parameterAsBoolean (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a static boolean value. More...

static bool	parameterAsBoolean (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a static boolean value. More...

static QString	parameterAsCompatibleSourceLayerPath (const QgsProcessingParameterDefinition definition, const QVariantMap &parameters, QgsProcessingContext &context, const QStringList &compatibleFormats, const QString &preferredFormat=QString("shp"), QgsProcessingFeedback feedback=nullptr)
	Evaluates the parameter with matching definition to a source vector layer file path of compatible format. More...

static QgsCoordinateReferenceSystem	parameterAsCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a coordinate reference system. More...

static QgsCoordinateReferenceSystem	parameterAsCrs (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a coordinate reference system. More...

static double	parameterAsDouble (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a static double value. More...

static double	parameterAsDouble (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a static double value. More...

static int	parameterAsEnum (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a enum value. More...

static int	parameterAsEnum (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a enum value. More...

static QList< int >	parameterAsEnums (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to list of enum values. More...

static QList< int >	parameterAsEnums (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to list of enum values. More...

static QString	parameterAsExpression (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to an expression. More...

static QString	parameterAsExpression (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definitionand value to an expression. More...

static QgsRectangle	parameterAsExtent (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
	Evaluates the parameter with matching definition to a rectangular extent. More...

static QgsRectangle	parameterAsExtent (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
	Evaluates the parameter with matching definition and value to a rectangular extent. More...

static QgsCoordinateReferenceSystem	parameterAsExtentCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Returns the coordinate reference system associated with an extent parameter value. More...

static QgsGeometry	parameterAsExtentGeometry (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
	Evaluates the parameter with matching definition to a rectangular extent, and returns a geometry covering this extent. More...

static QStringList	parameterAsFields (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a list of fields. More...

static QStringList	parameterAsFields (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a list of fields. More...

static QString	parameterAsFile (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a file/folder name. More...

static QString	parameterAsFile (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a file/folder name. More...

static QString	parameterAsFileOutput (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a file based output destination. More...

static QString	parameterAsFileOutput (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a file based output destination. More...

static int	parameterAsInt (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a static integer value. More...

static int	parameterAsInt (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a static integer value. More...

static QList< int >	parameterAsInts (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a list of integer values. More...

static QList< int >	parameterAsInts (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a list of integer values. More...

static QgsMapLayer *	parameterAsLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a map layer. More...

static QgsMapLayer *	parameterAsLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a map layer. More...

static QList< QgsMapLayer * >	parameterAsLayerList (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a list of map layers. More...

static QList< QgsMapLayer * >	parameterAsLayerList (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a list of map layers. More...

static QgsPrintLayout *	parameterAsLayout (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a print layout. More...

static QgsPrintLayout *	parameterAsLayout (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a print layout. More...

static QgsLayoutItem *	parameterAsLayoutItem (const QgsProcessingParameterDefinition definition, const QVariantMap &parameters, QgsProcessingContext &context, QgsPrintLayout layout)
	Evaluates the parameter with matching definition to a print layout item, taken from the specified layout. More...

static QgsLayoutItem *	parameterAsLayoutItem (const QgsProcessingParameterDefinition definition, const QVariant &value, QgsProcessingContext &context, QgsPrintLayout layout)
	Evaluates the parameter with matching definition and value to a print layout, taken from the specified layout. More...

static QVariantList	parameterAsMatrix (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a matrix/table of values. More...

static QVariantList	parameterAsMatrix (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a matrix/table of values. More...

static QgsMeshLayer *	parameterAsMeshLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a mesh layer. More...

static QgsMeshLayer *	parameterAsMeshLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a mesh layer. More...

static QString	parameterAsOutputLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a output layer destination. More...

static QString	parameterAsOutputLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a output layer destination. More...

static QgsPointXY	parameterAsPoint (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
	Evaluates the parameter with matching definition to a point. More...

static QgsPointXY	parameterAsPoint (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
	Evaluates the parameter with matching definition and value to a point. More...

static QgsCoordinateReferenceSystem	parameterAsPointCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Returns the coordinate reference system associated with an point parameter value. More...

static QgsCoordinateReferenceSystem	parameterAsPointCrs (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Returns the coordinate reference system associated with an point parameter value. More...

static QList< double >	parameterAsRange (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a range of values. More...

static QList< double >	parameterAsRange (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a range of values. More...

static QgsRasterLayer *	parameterAsRasterLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a raster layer. More...

static QgsRasterLayer *	parameterAsRasterLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a raster layer. More...

static QgsFeatureSink *	parameterAsSink (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context, QString &destinationIdentifier, QgsFeatureSink::SinkFlags sinkFlags=nullptr)
	Evaluates the parameter with matching definition to a feature sink. More...

static QgsFeatureSink *	parameterAsSink (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context, QString &destinationIdentifier, QgsFeatureSink::SinkFlags sinkFlags=nullptr)
	Evaluates the parameter with matching definition and value to a feature sink. More...

static QgsProcessingFeatureSource *	parameterAsSource (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a feature source. More...

static QgsProcessingFeatureSource *	parameterAsSource (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a feature source. More...

static QString	parameterAsString (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a static string value. More...

static QString	parameterAsString (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a static string value. More...

static QgsVectorLayer *	parameterAsVectorLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
	Evaluates the parameter with matching definition to a vector layer. More...

static QgsVectorLayer *	parameterAsVectorLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
	Evaluates the parameter with matching definition and value to a vector layer. More...

static QgsProcessingParameterDefinition *	parameterFromScriptCode (const QString &code)
	Creates a new QgsProcessingParameterDefinition using the configuration from a supplied script code string. More...

static QgsProcessingParameterDefinition *	parameterFromVariantMap (const QVariantMap &map)
	Creates a new QgsProcessingParameterDefinition using the configuration from a supplied variant map. More...

Detailed Description

A collection of utilities for working with parameters when running a processing algorithm.

Parameters are stored in a QVariantMap and referenced by a unique string key. The QVariants in parameters are not usually accessed directly, and instead the high level API provided through QgsProcessingParameters parameterAsString(), parameterAsDouble() are used instead.

Parameters are evaluated using a provided QgsProcessingContext, allowing the evaluation to understand available map layers and expression contexts (for expression based parameters).

Since: QGIS 3.0

Definition at line 612 of file qgsprocessingparameters.h.

Member Function Documentation

◆ descriptionFromName()

QString QgsProcessingParameters::descriptionFromName ( const QString & name )

static

Creates an autogenerated parameter description from a parameter name.

Definition at line 1638 of file qgsprocessingparameters.cpp.

◆ isDynamic()

bool QgsProcessingParameters::isDynamic	(	const QVariantMap &	parameters,
		const QString &	name
	)

static

Returns true if the parameter with matching name is a dynamic parameter, and must be evaluated once for every input feature processed.

Definition at line 54 of file qgsprocessingparameters.cpp.

◆ parameterAsBool() [1/2]

bool QgsProcessingParameters::parameterAsBool	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a static boolean value.

Definition at line 340 of file qgsprocessingparameters.cpp.

◆ parameterAsBool() [2/2]

bool QgsProcessingParameters::parameterAsBool	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a static boolean value.

Since: QGIS 3.4

Definition at line 356 of file qgsprocessingparameters.cpp.

◆ parameterAsBoolean() [1/2]

bool QgsProcessingParameters::parameterAsBoolean	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a static boolean value.

Since: QGIS 3.8

Definition at line 348 of file qgsprocessingparameters.cpp.

◆ parameterAsBoolean() [2/2]

bool QgsProcessingParameters::parameterAsBoolean	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a static boolean value.

Since: QGIS 3.8

Definition at line 372 of file qgsprocessingparameters.cpp.

◆ parameterAsCompatibleSourceLayerPath()

QString QgsProcessingParameters::parameterAsCompatibleSourceLayerPath	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context,
		const QStringList &	compatibleFormats,
		const QString &	preferredFormat = `QString( "shp" )`,
		QgsProcessingFeedback *	feedback = `nullptr`
	)

static

Evaluates the parameter with matching definition to a source vector layer file path of compatible format.

If the parameter is evaluated to an existing layer, and that layer is not of the format listed in the compatibleFormats argument, then the layer will first be exported to a compatible format in a temporary location. The function will then return the path to that temporary file.

compatibleFormats should consist entirely of lowercase file extensions, e.g. 'shp'.

The preferredFormat argument is used to specify to desired file extension to use when a temporary layer export is required. This defaults to shapefiles, because shapefiles are the future (don't believe the geopackage hype!).

Definition at line 481 of file qgsprocessingparameters.cpp.

◆ parameterAsCrs() [1/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsCrs	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a coordinate reference system.

Definition at line 749 of file qgsprocessingparameters.cpp.

◆ parameterAsCrs() [2/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsCrs	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a coordinate reference system.

Since: QGIS 3.4

Definition at line 757 of file qgsprocessingparameters.cpp.

◆ parameterAsDouble() [1/2]

double QgsProcessingParameters::parameterAsDouble	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a static double value.

Definition at line 123 of file qgsprocessingparameters.cpp.

◆ parameterAsDouble() [2/2]

double QgsProcessingParameters::parameterAsDouble	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a static double value.

Since: QGIS 3.4

Definition at line 131 of file qgsprocessingparameters.cpp.

◆ parameterAsEnum() [1/2]

int QgsProcessingParameters::parameterAsEnum	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a enum value.

Definition at line 249 of file qgsprocessingparameters.cpp.

◆ parameterAsEnum() [2/2]

int QgsProcessingParameters::parameterAsEnum	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a enum value.

Since: QGIS 3.4

Definition at line 257 of file qgsprocessingparameters.cpp.

◆ parameterAsEnums() [1/2]

QList< int > QgsProcessingParameters::parameterAsEnums	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to list of enum values.

Definition at line 271 of file qgsprocessingparameters.cpp.

◆ parameterAsEnums() [2/2]

QList< int > QgsProcessingParameters::parameterAsEnums	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to list of enum values.

Since: QGIS 3.4

Definition at line 279 of file qgsprocessingparameters.cpp.

◆ parameterAsExpression() [1/2]

QString QgsProcessingParameters::parameterAsExpression	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to an expression.

Definition at line 95 of file qgsprocessingparameters.cpp.

◆ parameterAsExpression() [2/2]

QString QgsProcessingParameters::parameterAsExpression	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definitionand value to an expression.

Since: QGIS 3.4

Definition at line 103 of file qgsprocessingparameters.cpp.

◆ parameterAsExtent() [1/2]

QgsRectangle QgsProcessingParameters::parameterAsExtent	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context,
		const QgsCoordinateReferenceSystem &	crs = `QgsCoordinateReferenceSystem()`
	)

static

Evaluates the parameter with matching definition to a rectangular extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. In this case the extent of the reproject rectangle will be returned.

See also: parameterAsExtentGeometry(); parameterAsExtentCrs()

Definition at line 821 of file qgsprocessingparameters.cpp.

◆ parameterAsExtent() [2/2]

QgsRectangle QgsProcessingParameters::parameterAsExtent	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context,
		const QgsCoordinateReferenceSystem &	crs = `QgsCoordinateReferenceSystem()`
	)

static

Evaluates the parameter with matching definition and value to a rectangular extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. In this case the extent of the reproject rectangle will be returned.

See also: parameterAsExtentGeometry(); parameterAsExtentCrs()

Since: QGIS 3.4

Definition at line 830 of file qgsprocessingparameters.cpp.

◆ parameterAsExtentCrs()

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsExtentCrs	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Returns the coordinate reference system associated with an extent parameter value.

See also: parameterAsExtent()

Definition at line 1063 of file qgsprocessingparameters.cpp.

◆ parameterAsExtentGeometry()

QgsGeometry QgsProcessingParameters::parameterAsExtentGeometry	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context,
		const QgsCoordinateReferenceSystem &	crs = `QgsCoordinateReferenceSystem()`
	)

static

Evaluates the parameter with matching definition to a rectangular extent, and returns a geometry covering this extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. Unlike parameterAsExtent(), the reprojected rectangle returned by this function will no longer be a rectangle itself (i.e. this method returns the geometry of the actual reprojected rectangle, while parameterAsExtent() returns just the extent of the reprojected rectangle).

See also: parameterAsExtent(); parameterAsExtentCrs()

Definition at line 945 of file qgsprocessingparameters.cpp.

◆ parameterAsFields() [1/2]

QStringList QgsProcessingParameters::parameterAsFields	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a list of fields.

Definition at line 1465 of file qgsprocessingparameters.cpp.

◆ parameterAsFields() [2/2]

QStringList QgsProcessingParameters::parameterAsFields	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a list of fields.

Since: QGIS 3.4

Definition at line 1474 of file qgsprocessingparameters.cpp.

◆ parameterAsFile() [1/2]

QString QgsProcessingParameters::parameterAsFile	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a file/folder name.

Definition at line 1258 of file qgsprocessingparameters.cpp.

◆ parameterAsFile() [2/2]

QString QgsProcessingParameters::parameterAsFile	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a file/folder name.

Since: QGIS 3.4

Definition at line 1269 of file qgsprocessingparameters.cpp.

◆ parameterAsFileOutput() [1/2]

QString QgsProcessingParameters::parameterAsFileOutput	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a file based output destination.

Definition at line 696 of file qgsprocessingparameters.cpp.

◆ parameterAsFileOutput() [2/2]

QString QgsProcessingParameters::parameterAsFileOutput	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a file based output destination.

Since: QGIS 3.4

Definition at line 706 of file qgsprocessingparameters.cpp.

◆ parameterAsInt() [1/2]

int QgsProcessingParameters::parameterAsInt	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a static integer value.

Definition at line 150 of file qgsprocessingparameters.cpp.

◆ parameterAsInt() [2/2]

int QgsProcessingParameters::parameterAsInt	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a static integer value.

Since: QGIS 3.4

Definition at line 158 of file qgsprocessingparameters.cpp.

◆ parameterAsInts() [1/2]

QList< int > QgsProcessingParameters::parameterAsInts	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a list of integer values.

Since: QGIS 3.4

Definition at line 192 of file qgsprocessingparameters.cpp.

◆ parameterAsInts() [2/2]

QList< int > QgsProcessingParameters::parameterAsInts	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a list of integer values.

Since: QGIS 3.4

Definition at line 200 of file qgsprocessingparameters.cpp.

◆ parameterAsLayer() [1/2]

QgsMapLayer * QgsProcessingParameters::parameterAsLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a map layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 550 of file qgsprocessingparameters.cpp.

◆ parameterAsLayer() [2/2]

QgsMapLayer * QgsProcessingParameters::parameterAsLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a map layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since: QGIS 3.4

Definition at line 558 of file qgsprocessingparameters.cpp.

◆ parameterAsLayerList() [1/2]

QList< QgsMapLayer * > QgsProcessingParameters::parameterAsLayerList	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a list of map layers.

Definition at line 1319 of file qgsprocessingparameters.cpp.

◆ parameterAsLayerList() [2/2]

QList< QgsMapLayer * > QgsProcessingParameters::parameterAsLayerList	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a list of map layers.

Since: QGIS 3.4

Definition at line 1327 of file qgsprocessingparameters.cpp.

◆ parameterAsLayout() [1/2]

QgsPrintLayout * QgsProcessingParameters::parameterAsLayout	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a print layout.

Warning: This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.

Since: QGIS 3.8

Definition at line 1515 of file qgsprocessingparameters.cpp.

◆ parameterAsLayout() [2/2]

QgsPrintLayout * QgsProcessingParameters::parameterAsLayout	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a print layout.

Warning: This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.

Since: QGIS 3.8

Definition at line 1523 of file qgsprocessingparameters.cpp.

◆ parameterAsLayoutItem() [1/2]

QgsLayoutItem * QgsProcessingParameters::parameterAsLayoutItem	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context,
		QgsPrintLayout *	layout
	)

static

Evaluates the parameter with matching definition to a print layout item, taken from the specified layout.

Warning: This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.

Since: QGIS 3.8

Definition at line 1539 of file qgsprocessingparameters.cpp.

◆ parameterAsLayoutItem() [2/2]

QgsLayoutItem * QgsProcessingParameters::parameterAsLayoutItem	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context,
		QgsPrintLayout *	layout
	)

static

Evaluates the parameter with matching definition and value to a print layout, taken from the specified layout.

Warning: This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.

Since: QGIS 3.8

Definition at line 1547 of file qgsprocessingparameters.cpp.

◆ parameterAsMatrix() [1/2]

QVariantList QgsProcessingParameters::parameterAsMatrix	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a matrix/table of values.

Tables are collapsed to a 1 dimensional list.

Definition at line 1280 of file qgsprocessingparameters.cpp.

◆ parameterAsMatrix() [2/2]

QVariantList QgsProcessingParameters::parameterAsMatrix	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a matrix/table of values.

Tables are collapsed to a 1 dimensional list.

Since: QGIS 3.4

Definition at line 1288 of file qgsprocessingparameters.cpp.

◆ parameterAsMeshLayer() [1/2]

QgsMeshLayer * QgsProcessingParameters::parameterAsMeshLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a mesh layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since: QGIS 3.6

Definition at line 617 of file qgsprocessingparameters.cpp.

◆ parameterAsMeshLayer() [2/2]

QgsMeshLayer * QgsProcessingParameters::parameterAsMeshLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a mesh layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since: QGIS 3.6

Definition at line 622 of file qgsprocessingparameters.cpp.

◆ parameterAsOutputLayer() [1/2]

QString QgsProcessingParameters::parameterAsOutputLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a output layer destination.

Definition at line 627 of file qgsprocessingparameters.cpp.

◆ parameterAsOutputLayer() [2/2]

QString QgsProcessingParameters::parameterAsOutputLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a output layer destination.

Since: QGIS 3.4

Definition at line 637 of file qgsprocessingparameters.cpp.

◆ parameterAsPoint() [1/2]

QgsPointXY QgsProcessingParameters::parameterAsPoint	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context,
		const QgsCoordinateReferenceSystem &	crs = `QgsCoordinateReferenceSystem()`
	)

static

Evaluates the parameter with matching definition to a point.

If crs is set then the point will be automatically reprojected so that it is in the specified crs.

See also: parameterAsPointCrs()

Definition at line 1140 of file qgsprocessingparameters.cpp.

◆ parameterAsPoint() [2/2]

QgsPointXY QgsProcessingParameters::parameterAsPoint	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context,
		const QgsCoordinateReferenceSystem &	crs = `QgsCoordinateReferenceSystem()`
	)

static

Evaluates the parameter with matching definition and value to a point.

If crs is set then the point will be automatically reprojected so that it is in the specified crs.

See also: parameterAsPointCrs()

Since: QGIS 3.4

Definition at line 1148 of file qgsprocessingparameters.cpp.

◆ parameterAsPointCrs() [1/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsPointCrs	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Returns the coordinate reference system associated with an point parameter value.

See also: parameterAsPoint()

Definition at line 1224 of file qgsprocessingparameters.cpp.

◆ parameterAsPointCrs() [2/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsPointCrs	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Returns the coordinate reference system associated with an point parameter value.

See also: parameterAsPoint()

Since: QGIS 3.8

Definition at line 1230 of file qgsprocessingparameters.cpp.

◆ parameterAsRange() [1/2]

QList< double > QgsProcessingParameters::parameterAsRange	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a range of values.

Definition at line 1414 of file qgsprocessingparameters.cpp.

◆ parameterAsRange() [2/2]

QList< double > QgsProcessingParameters::parameterAsRange	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a range of values.

Since: QGIS 3.4

Definition at line 1422 of file qgsprocessingparameters.cpp.

◆ parameterAsRasterLayer() [1/2]

QgsRasterLayer * QgsProcessingParameters::parameterAsRasterLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a raster layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 607 of file qgsprocessingparameters.cpp.

◆ parameterAsRasterLayer() [2/2]

QgsRasterLayer * QgsProcessingParameters::parameterAsRasterLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a raster layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since: QGIS 3.4

Definition at line 612 of file qgsprocessingparameters.cpp.

◆ parameterAsSink() [1/2]

QgsFeatureSink * QgsProcessingParameters::parameterAsSink	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsFields &	fields,
		QgsWkbTypes::Type	geometryType,
		const QgsCoordinateReferenceSystem &	crs,
		QgsProcessingContext &	context,
		QString &	destinationIdentifier,
		QgsFeatureSink::SinkFlags	sinkFlags = `nullptr`
	)

static

Evaluates the parameter with matching definition to a feature sink.

The fields, geometryType and crs parameters dictate the properties of the resulting feature sink.

Sinks will either be taken from context's active project, or created from external providers and stored temporarily in the context. The destinationIdentifier argument will be set to a string which can be used to retrieve the layer corresponding to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().

This function creates a new object and the caller takes responsibility for deleting the returned object.

Definition at line 388 of file qgsprocessingparameters.cpp.

◆ parameterAsSink() [2/2]

QgsFeatureSink * QgsProcessingParameters::parameterAsSink	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsFields &	fields,
		QgsWkbTypes::Type	geometryType,
		const QgsCoordinateReferenceSystem &	crs,
		QgsProcessingContext &	context,
		QString &	destinationIdentifier,
		QgsFeatureSink::SinkFlags	sinkFlags = `nullptr`
	)

static

Evaluates the parameter with matching definition and value to a feature sink.

The fields, geometryType and crs parameters dictate the properties of the resulting feature sink.

Sinks will either be taken from context's active project, or created from external providers and stored temporarily in the context. The destinationIdentifier argument will be set to a string which can be used to retrieve the layer corresponding to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().

This function creates a new object and the caller takes responsibility for deleting the returned object.

Since: QGIS 3.4

Definition at line 401 of file qgsprocessingparameters.cpp.

◆ parameterAsSource() [1/2]

QgsProcessingFeatureSource * QgsProcessingParameters::parameterAsSource	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a feature source.

Sources will either be taken from context's active project, or loaded from external sources and stored temporarily in the context.

This function creates a new object and the caller takes responsibility for deleting the returned object.

Definition at line 465 of file qgsprocessingparameters.cpp.

◆ parameterAsSource() [2/2]

QgsProcessingFeatureSource * QgsProcessingParameters::parameterAsSource	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a feature source.

Sources will either be taken from context's active project, or loaded from external sources and stored temporarily in the context.

This function creates a new object and the caller takes responsibility for deleting the returned object.

Since: QGIS 3.4

Definition at line 473 of file qgsprocessingparameters.cpp.

◆ parameterAsString() [1/2]

QString QgsProcessingParameters::parameterAsString	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a static string value.

Definition at line 63 of file qgsprocessingparameters.cpp.

◆ parameterAsString() [2/2]

QString QgsProcessingParameters::parameterAsString	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		const QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a static string value.

Since: QGIS 3.4

Definition at line 71 of file qgsprocessingparameters.cpp.

◆ parameterAsVectorLayer() [1/2]

QgsVectorLayer * QgsProcessingParameters::parameterAsVectorLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariantMap &	parameters,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition to a vector layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 739 of file qgsprocessingparameters.cpp.

◆ parameterAsVectorLayer() [2/2]

QgsVectorLayer * QgsProcessingParameters::parameterAsVectorLayer	(	const QgsProcessingParameterDefinition *	definition,
		const QVariant &	value,
		QgsProcessingContext &	context
	)

static

Evaluates the parameter with matching definition and value to a vector layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since: QGIS 3.4

Definition at line 744 of file qgsprocessingparameters.cpp.

◆ parameterFromScriptCode()

QgsProcessingParameterDefinition * QgsProcessingParameters::parameterFromScriptCode ( const QString & code )

static

Creates a new QgsProcessingParameterDefinition using the configuration from a supplied script code string.

The caller takes responsibility for deleting the returned object.

Definition at line 1645 of file qgsprocessingparameters.cpp.

◆ parameterFromVariantMap()

QgsProcessingParameterDefinition * QgsProcessingParameters::parameterFromVariantMap ( const QVariantMap & map )

static

Creates a new QgsProcessingParameterDefinition using the configuration from a supplied variant map.

The caller takes responsibility for deleting the returned object.

Definition at line 1565 of file qgsprocessingparameters.cpp.

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

/tmp/buildd/qgis-3.8.0+99unstable/src/core/processing/qgsprocessingparameters.h
/tmp/buildd/qgis-3.8.0+99unstable/src/core/processing/qgsprocessingparameters.cpp

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ descriptionFromName()

◆ isDynamic()

◆ parameterAsBool() [1/2]

◆ parameterAsBool() [2/2]

◆ parameterAsBoolean() [1/2]

◆ parameterAsBoolean() [2/2]

◆ parameterAsCompatibleSourceLayerPath()

◆ parameterAsCrs() [1/2]

◆ parameterAsCrs() [2/2]

◆ parameterAsDouble() [1/2]

◆ parameterAsDouble() [2/2]

◆ parameterAsEnum() [1/2]

◆ parameterAsEnum() [2/2]

◆ parameterAsEnums() [1/2]

◆ parameterAsEnums() [2/2]

◆ parameterAsExpression() [1/2]

◆ parameterAsExpression() [2/2]

◆ parameterAsExtent() [1/2]

◆ parameterAsExtent() [2/2]

◆ parameterAsExtentCrs()

◆ parameterAsExtentGeometry()

◆ parameterAsFields() [1/2]

◆ parameterAsFields() [2/2]

◆ parameterAsFile() [1/2]

◆ parameterAsFile() [2/2]

◆ parameterAsFileOutput() [1/2]

◆ parameterAsFileOutput() [2/2]

◆ parameterAsInt() [1/2]

◆ parameterAsInt() [2/2]

◆ parameterAsInts() [1/2]

◆ parameterAsInts() [2/2]

◆ parameterAsLayer() [1/2]

◆ parameterAsLayer() [2/2]

◆ parameterAsLayerList() [1/2]

◆ parameterAsLayerList() [2/2]

◆ parameterAsLayout() [1/2]

◆ parameterAsLayout() [2/2]

◆ parameterAsLayoutItem() [1/2]

◆ parameterAsLayoutItem() [2/2]

◆ parameterAsMatrix() [1/2]

◆ parameterAsMatrix() [2/2]

◆ parameterAsMeshLayer() [1/2]

◆ parameterAsMeshLayer() [2/2]

◆ parameterAsOutputLayer() [1/2]

◆ parameterAsOutputLayer() [2/2]

◆ parameterAsPoint() [1/2]

◆ parameterAsPoint() [2/2]

◆ parameterAsPointCrs() [1/2]

◆ parameterAsPointCrs() [2/2]

◆ parameterAsRange() [1/2]

◆ parameterAsRange() [2/2]

◆ parameterAsRasterLayer() [1/2]

◆ parameterAsRasterLayer() [2/2]

◆ parameterAsSink() [1/2]

◆ parameterAsSink() [2/2]

◆ parameterAsSource() [1/2]

◆ parameterAsSource() [2/2]

◆ parameterAsString() [1/2]

◆ parameterAsString() [2/2]

◆ parameterAsVectorLayer() [1/2]

◆ parameterAsVectorLayer() [2/2]

◆ parameterFromScriptCode()

◆ parameterFromVariantMap()