Class: QgsProcessingProvider¶
-
class
qgis.core.
QgsProcessingProvider
(parent: QObject = None)¶ Bases:
PyQt5.QtCore.QObject
Constructor for QgsProcessingProvider.
Abstract base class for processing providers. An algorithm provider is a set of related algorithms, typically from the same external application or related to a common area of analysis.
New in version 3.0: Enums
Methods
Adds an
algorithm
to the provider.Returns the matching algorithm by
name
, or a None if no matching algorithm is contained by this provider.Returns a list of algorithms supplied by this provider.
Returns true if the provider can be activated, or false if it cannot be activated (e.g.
Returns the default file extension to use for raster outputs created by the provider.
Returns the default file extension to use for vector outputs created by the provider.
Returns the provider help id string, used for creating QgsHelp urls for algorithms belong to this provider.
Returns an icon for the provider.
Returns the unique provider id, used for identifying the provider.
Returns true if the provider is active and able to run algorithms.
Returns true if the specified
outputValue
is of a supported file format for the given destinationparameter
.Loads the provider.
Loads all algorithms belonging to this provider.
Returns the longer version of the provider name, which can include extra details such as version numbers.
Returns the provider name, which is used to describe the provider within the GUI.
Refreshes the algorithms available from the provider, causing it to re-populate with all associated algorithms.
Returns a list of the raster format file extensions supported by this provider.
Returns a list of the table (geometry-less vector layers) file extensions supported by this provider.
Returns a list of the vector format file extensions supported by this provider.
Returns true if the provider supports non-file based outputs (such as memory layers or direct database outputs).
Returns a path to an SVG version of the provider’s icon.
Unloads the provider.
Signals
Emitted when the provider has loaded (or refreshed) its list of available algorithms.
Attributes
-
addAlgorithm
(self, algorithm: QgsProcessingAlgorithm) → bool¶ Adds an
algorithm
to the provider. Ownership of the algorithm is transferred to the provider.
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algorithm
(self, name: str) → QgsProcessingAlgorithm¶ Returns the matching algorithm by
name
, or a None if no matching algorithm is contained by this provider.See also
-
algorithms
(self) → object¶ Returns a list of algorithms supplied by this provider.
See also
-
algorithmsLoaded
¶ Emitted when the provider has loaded (or refreshed) its list of available algorithms.
See also
refreshAlgorithms()
[signal]
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canBeActivated
(self) → bool¶ Returns true if the provider can be activated, or false if it cannot be activated (e.g. due to missing external dependencies).
See also
-
childEvent
()¶
-
connectNotify
()¶
-
customEvent
()¶
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defaultRasterFileExtension
(self) → str¶ Returns the default file extension to use for raster outputs created by the provider.
The default implementation returns the user’s default Processing raster output format setting, if it’s supported by the provider (see supportedOutputRasterLayerExtensions()). Otherwise the first reported supported raster format will be used.
See also
-
defaultVectorFileExtension
(self, hasGeometry: bool = True) → str¶ Returns the default file extension to use for vector outputs created by the provider.
If
hasGeometry
is true then the output file format must have support for geometry. IfhasGeometry
is false then non-spatial formats can be used.The default implementation returns the user’s default Processing vector output format setting, if it’s supported by the provider (see supportedOutputVectorLayerExtensions()). Otherwise the first reported supported vector format will be used.
See also
-
disconnectNotify
()¶
-
helpId
(self) → str¶ Returns the provider help id string, used for creating QgsHelp urls for algorithms belong to this provider. By default, this returns an empty string, meaning that no QgsHelp url should be created for the provider’s algorithms.
See also
-
icon
(self) → QIcon¶ Returns an icon for the provider.
See also
-
id
(self) → str¶ Returns the unique provider id, used for identifying the provider. This string should be a unique, short, character only string, eg “qgis” or “gdal”. This string should not be localised.
See also
See also
-
isActive
(self) → bool¶ Returns true if the provider is active and able to run algorithms.
-
isSignalConnected
()¶
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isSupportedOutputValue
(self, outputValue: Any, parameter: QgsProcessingDestinationParameter, context: QgsProcessingContext) → Tuple[bool, str]¶ Returns true if the specified
outputValue
is of a supported file format for the given destinationparameter
.If the output value is not supported,
error
will be set to a descriptive message explaining why.New in version 3.6.
-
load
(self) → bool¶ Loads the provider. This will be called when the plugin is being loaded, and any general setup actions should occur in an overridden version of this method. Subclasses should not individually load any algorithms in their load() implementations, as that must occur within the loadAlgorithms() method. Instead, subclasses should call refreshAlgorithms() from any overloaded load() method to trigger an initial load of the provider’s algorithms.
- Returns
true if provider could be successfully loaded
See also
-
loadAlgorithms
(self)¶ Loads all algorithms belonging to this provider. Subclasses should implement this, calling addAlgorithm() to register all their associated algorithms.
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longName
(self) → str¶ Returns the longer version of the provider name, which can include extra details such as version numbers. E.g. “Lastools LIDAR tools (version 2.2.1)”. This string should be localised.
The default implementation returns the same string as name().
See also
See also
-
name
(self) → str¶ Returns the provider name, which is used to describe the provider within the GUI. This string should be short (e.g. “Lastools”) and localised.
See also
See also
-
receivers
()¶
-
refreshAlgorithms
(self)¶ Refreshes the algorithms available from the provider, causing it to re-populate with all associated algorithms.
-
sender
()¶
-
senderSignalIndex
()¶
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supportedOutputRasterLayerExtensions
(self) → List[str]¶ Returns a list of the raster format file extensions supported by this provider.
-
supportedOutputTableExtensions
(self) → List[str]¶ Returns a list of the table (geometry-less vector layers) file extensions supported by this provider.
By default this is the same as supportedOutputVectorLayerExtensions(). Providers which utilize different formats for geometry-less layers can override this method to return a different list of supported formats.
See also
See also
New in version 3.4.3.
-
supportedOutputVectorLayerExtensions
(self) → List[str]¶ Returns a list of the vector format file extensions supported by this provider.
See also
See also
See also
-
supportsNonFileBasedOutput
(self) → bool¶ Returns true if the provider supports non-file based outputs (such as memory layers or direct database outputs). If a provider returns false for this method than it indicates that none of the outputs from any of the provider’s algorithms have support for non-file based outputs. Returning true indicates that the algorithm’s parameters will each individually declare their non-file based support.
The default behavior for providers is to support non-file based outputs, and most providers which rely solely on QGIS API (and which do not depend on third-party scripts or external dependencies) will automatically support this.
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timerEvent
()¶
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