QgsProcessingRegistry Class Reference

Registry for various processing components, including providers, algorithms and various parameters and outputs. More...

#include <qgsprocessingregistry.h>

Inheritance diagram for QgsProcessingRegistry:

Signals
void	parameterTypeAdded (QgsProcessingParameterType *type)
	Emitted when a new parameter type has been added to the registry. More...
void	parameterTypeRemoved (QgsProcessingParameterType *type)
	Emitted when a parameter type has been removed from the registry and is about to be deleted. More...
void	providerAdded (const QString &id)
	Emitted when a provider has been added to the registry. More...
void	providerRemoved (const QString &id)
	Emitted when a provider is removed from the registry. More...

Public Member Functions
	QgsProcessingRegistry (const QgsProcessingRegistry &other)=delete
	Registry cannot be copied. More...
	QgsProcessingRegistry (QObject *parent=nullptr)
	Constructor for QgsProcessingRegistry. More...
	~QgsProcessingRegistry () override
void	addAlgorithmAlias (const QString &aliasId, const QString &actualId)
	Adds a new alias to an existing algorithm. More...
bool	addParameterType (QgsProcessingParameterType *type)
	Register a new parameter type for processing. More...
bool	addProvider (QgsProcessingProvider *provider)
	Add a processing provider to the registry. More...
const QgsProcessingAlgorithm *	algorithmById (const QString &id) const
	Finds an algorithm by its ID. More...
QList< const QgsProcessingAlgorithm * >	algorithms () const
	Returns a list of all available algorithms from registered providers. More...
QgsProcessingAlgorithm *	createAlgorithmById (const QString &id, const QVariantMap &configuration=QVariantMap()) const
	Creates a new instance of an algorithm by its ID. More...
QgsProcessingRegistry &	operator= (const QgsProcessingRegistry &other)=delete
	Registry cannot be copied. More...
QgsProcessingParameterType *	parameterType (const QString &id) const
	Returns the parameter type registered for id. More...
QList< QgsProcessingParameterType * >	parameterTypes () const
	Returns a list with all known parameter types. More...
QgsProcessingProvider *	providerById (const QString &id)
	Returns a matching provider by provider ID. More...
QList< QgsProcessingProvider * >	providers () const
	Gets list of available providers. More...
void	removeParameterType (QgsProcessingParameterType *type)
	Unregister a custom parameter type from processing. More...
bool	removeProvider (const QString &providerId)
	Removes a provider implementation from the registry (the provider object is deleted). More...
bool	removeProvider (QgsProcessingProvider *provider)
	Removes a provider implementation from the registry (the provider object is deleted). More...

Detailed Description

Registry for various processing components, including providers, algorithms and various parameters and outputs.

QgsProcessingRegistry is not usually directly created, but rather accessed through QgsApplication::processingRegistry().

Since

QGIS 3.0

Definition at line 39 of file qgsprocessingregistry.h.

Constructor & Destructor Documentation

QgsProcessingRegistry() [1/2]

QgsProcessingRegistry::QgsProcessingRegistry

(

QObject *

parent = nullptr

)

Constructor for QgsProcessingRegistry.

Definition at line 28 of file qgsprocessingregistry.cpp.

~QgsProcessingRegistry()

QgsProcessingRegistry::~QgsProcessingRegistry ( )

override

Definition at line 81 of file qgsprocessingregistry.cpp.

QgsProcessingRegistry() [2/2]

QgsProcessingRegistry::QgsProcessingRegistry ( const QgsProcessingRegistry &  other )

delete

Registry cannot be copied.

Member Function Documentation

addAlgorithmAlias()

void QgsProcessingRegistry::addAlgorithmAlias	(	const QString &	aliasId,
		const QString &	actualId
	)

Adds a new alias to an existing algorithm.

This allows algorithms to be referred to by a different provider ID and algorithm name to their actual underlying provider and algorithm name. It provides a mechanism to allow algorithms to be moved between providers without breaking existing scripts or plugins.

The aliasId argument specifies the "fake" algorithm id (eg "fake_provider:fake_alg") by which the algorithm can be referred to, and the actualId argument specifies the real algorithm ID for the algorithm.

Since

QGIS 3.10

Definition at line 196 of file qgsprocessingregistry.cpp.

addParameterType()

bool QgsProcessingRegistry::addParameterType

(

QgsProcessingParameterType *

type

)

Register a new parameter type for processing.

Ownership is transferred to the registry. Will emit parameterTypeAdded.

See also

removeParameterType

Since

QGIS 3.2

Definition at line 201 of file qgsprocessingregistry.cpp.

addProvider()

bool QgsProcessingRegistry::addProvider

(

QgsProcessingProvider *

provider

)

Add a processing provider to the registry.

Ownership of the provider is transferred to the registry, and the provider's parent will be set to the registry. Returns false if the provider could not be added (eg if a provider with a duplicate ID already exists in the registry). Adding a provider to the registry automatically triggers the providers QgsProcessingProvider::load() method to populate the provider with algorithms.

See also

removeProvider()

Definition at line 97 of file qgsprocessingregistry.cpp.

algorithmById()

const QgsProcessingAlgorithm * QgsProcessingRegistry::algorithmById

(

const QString &

id

)

const

Finds an algorithm by its ID.

If no matching algorithm is found, nullptr is returned.

See also

algorithms()

createAlgorithmById()

Definition at line 161 of file qgsprocessingregistry.cpp.

algorithms()

QList< const QgsProcessingAlgorithm * > QgsProcessingRegistry::algorithms

(

)

const

Returns a list of all available algorithms from registered providers.

See also

algorithmById()

Definition at line 150 of file qgsprocessingregistry.cpp.

createAlgorithmById()

QgsProcessingAlgorithm * QgsProcessingRegistry::createAlgorithmById	(	const QString &	id,
		const QVariantMap &	configuration = QVariantMap()
	)		const

Creates a new instance of an algorithm by its ID.

If no matching algorithm is found, nullptr is returned. Callers take responsibility for deleting the returned object.

The configuration argument allows passing of a map of configuration settings to the algorithm, allowing it to dynamically adjust its initialized parameters and outputs according to this configuration. This is generally used only for algorithms in a model, allowing them to adjust their behavior at run time according to some user configuration.

See also

algorithms()

algorithmById()

Definition at line 186 of file qgsprocessingregistry.cpp.

operator=()

QgsProcessingRegistry & QgsProcessingRegistry::operator= ( const QgsProcessingRegistry &  other )

delete

Registry cannot be copied.

parameterType()

QgsProcessingParameterType * QgsProcessingRegistry::parameterType

(

const QString &

id

)

const

Returns the parameter type registered for id.

Since

QGIS 3.2

Definition at line 227 of file qgsprocessingregistry.cpp.

parameterTypeAdded

void QgsProcessingRegistry::parameterTypeAdded ( QgsProcessingParameterType *  type )

signal

Emitted when a new parameter type has been added to the registry.

Since

QGIS 3.2

parameterTypeRemoved

void QgsProcessingRegistry::parameterTypeRemoved ( QgsProcessingParameterType *  type )

signal

Emitted when a parameter type has been removed from the registry and is about to be deleted.

Since

QGIS 3.2

parameterTypes()

QList< QgsProcessingParameterType * > QgsProcessingRegistry::parameterTypes

(

)

const

Returns a list with all known parameter types.

Since

QGIS 3.2

Definition at line 232 of file qgsprocessingregistry.cpp.

providerAdded

void QgsProcessingRegistry::providerAdded ( const QString &  id )

signal

Emitted when a provider has been added to the registry.

providerById()

QgsProcessingProvider * QgsProcessingRegistry::providerById

(

const QString &

id

)

Returns a matching provider by provider ID.

Definition at line 145 of file qgsprocessingregistry.cpp.

providerRemoved

void QgsProcessingRegistry::providerRemoved ( const QString &  id )

signal

Emitted when a provider is removed from the registry.

providers()

QList< QgsProcessingProvider * > QgsProcessingRegistry::providers ( ) const

inline

Gets list of available providers.

Definition at line 60 of file qgsprocessingregistry.h.

removeParameterType()

void QgsProcessingRegistry::removeParameterType

(

QgsProcessingParameterType *

type

)

Unregister a custom parameter type from processing.

The type will be deleted. Will emit parameterTypeRemoved.

See also

addParameterType

Since

QGIS 3.2

Definition at line 220 of file qgsprocessingregistry.cpp.

removeProvider() [1/2]

bool QgsProcessingRegistry::removeProvider

(

const QString &

providerId

)

Removes a provider implementation from the registry (the provider object is deleted).

Returns false if the provider could not be removed (eg provider does not exist in the registry).

See also

addProvider()

Definition at line 139 of file qgsprocessingregistry.cpp.

removeProvider() [2/2]

bool QgsProcessingRegistry::removeProvider

(

QgsProcessingProvider *

provider

)

Removes a provider implementation from the registry (the provider object is deleted).

Returns false if the provider could not be removed (eg provider does not exist in the registry).

See also

addProvider()

Definition at line 122 of file qgsprocessingregistry.cpp.

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

• /build/qgis-3.28.0+99sid/src/core/processing/qgsprocessingregistry.h
• /build/qgis-3.28.0+99sid/src/core/processing/qgsprocessingregistry.cpp