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8a84e134cc
Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
593 lines
22 KiB
Plaintext
593 lines
22 KiB
Plaintext
/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/processing/qgsprocessingalgorithm.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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class QgsProcessingAlgorithm
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{
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%Docstring
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Abstract base class for processing algorithms.
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.. versionadded:: 3.0
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%End
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%TypeHeaderCode
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#include "qgsprocessingalgorithm.h"
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%End
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public:
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enum Flag
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{
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FlagHideFromToolbox,
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FlagHideFromModeler,
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FlagSupportsBatch,
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FlagCanCancel,
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FlagRequiresMatchingCrs,
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FlagDeprecated,
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};
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typedef QFlags<QgsProcessingAlgorithm::Flag> Flags;
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QgsProcessingAlgorithm();
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%Docstring
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Constructor for QgsProcessingAlgorithm.
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%End
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virtual ~QgsProcessingAlgorithm();
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virtual QgsProcessingAlgorithm *create() const = 0 /Factory/;
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%Docstring
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Creates a copy of the algorithm, ready for execution.
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:rtype: QgsProcessingAlgorithm
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%End
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virtual QString name() const = 0;
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%Docstring
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Returns the algorithm name, used for identifying the algorithm. This string
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should be fixed for the algorithm, and must not be localised. The name should
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be unique within each provider. Names should contain lowercase alphanumeric characters
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only and no spaces or other formatting characters.
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.. seealso:: displayName()
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.. seealso:: group()
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.. seealso:: tags()
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:rtype: str
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%End
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QString id() const;
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%Docstring
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Returns the unique ID for the algorithm, which is a combination of the algorithm
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provider's ID and the algorithms unique name (e.g. "qgis:mergelayers" ).
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.. seealso:: name()
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.. seealso:: provider()
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:rtype: str
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%End
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virtual QString displayName() const = 0;
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%Docstring
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Returns the translated algorithm name, which should be used for any user-visible display
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of the algorithm name.
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.. seealso:: name()
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:rtype: str
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%End
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virtual QStringList tags() const;
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%Docstring
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Returns a list of tags which relate to the algorithm, and are used to assist users in searching
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for suitable algorithms. These tags should be localised.
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:rtype: list of str
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%End
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virtual QString shortHelpString() const;
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%Docstring
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Returns a localised short helper string for the algorithm. This string should provide a basic description
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about what the algorithm does and the parameters and outputs associated with it.
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.. seealso:: helpString()
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.. seealso:: helpUrl()
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:rtype: str
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%End
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virtual QString helpString() const;
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%Docstring
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Returns a localised help string for the algorithm. Algorithm subclasses should implement either
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helpString() or helpUrl().
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.. seealso:: helpUrl()
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.. seealso:: shortHelpString()
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:rtype: str
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%End
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virtual QString helpUrl() const;
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%Docstring
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Returns a url pointing to the algorithm's help page.
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.. seealso:: helpString()
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.. seealso:: shortHelpString()
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:rtype: str
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%End
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virtual QIcon icon() const;
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%Docstring
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Returns an icon for the algorithm.
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.. seealso:: svgIconPath()
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:rtype: QIcon
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%End
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virtual QString svgIconPath() const;
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%Docstring
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Returns a path to an SVG version of the algorithm's icon.
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.. seealso:: icon()
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:rtype: str
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%End
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virtual QString group() const;
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%Docstring
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Returns the name of the group this algorithm belongs to. This string
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should be localised.
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.. seealso:: tags()
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:rtype: str
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%End
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virtual Flags flags() const;
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%Docstring
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Returns the flags indicating how and when the algorithm operates and should be exposed to users.
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Default flags are FlagSupportsBatch and FlagCanCancel.
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:rtype: Flags
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%End
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virtual bool canExecute( QString *errorMessage /Out/ = 0 ) const;
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%Docstring
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Returns true if the algorithm can execute. Algorithm subclasses can return false
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here to indicate that they are not able to execute, e.g. as a result of unmet
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external dependencies. If specified, the ``errorMessage`` argument will be filled
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with a localised error message describing why the algorithm cannot execute.
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:rtype: bool
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%End
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virtual bool checkParameterValues( const QVariantMap ¶meters,
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QgsProcessingContext &context, QString *message /Out/ = 0 ) const;
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%Docstring
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Checks the supplied ``parameter`` values to verify that they satisfy the requirements
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of this algorithm in the supplied ``context``. The ``message`` parameter will be
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filled with explanatory text if validation fails.
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Overridden implementations should also check this base class implementation.
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:return: true if parameters are acceptable for the algorithm.
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:rtype: bool
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%End
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QgsProcessingProvider *provider() const;
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%Docstring
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Returns the provider to which this algorithm belongs.
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:rtype: QgsProcessingProvider
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%End
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QgsProcessingParameterDefinitions parameterDefinitions() const;
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%Docstring
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Returns an ordered list of parameter definitions utilized by the algorithm.
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.. seealso:: addParameter()
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.. seealso:: parameterDefinition()
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.. seealso:: destinationParameterDefinitions()
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:rtype: QgsProcessingParameterDefinitions
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%End
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const QgsProcessingParameterDefinition *parameterDefinition( const QString &name ) const;
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%Docstring
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Returns a matching parameter by ``name``. Matching is done in a case-insensitive
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manner.
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.. seealso:: parameterDefinitions()
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:rtype: QgsProcessingParameterDefinition
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%End
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int countVisibleParameters() const;
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%Docstring
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Returns the number of visible (non-hidden) parameters defined by this
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algorithm.
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:rtype: int
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%End
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QgsProcessingParameterDefinitions destinationParameterDefinitions() const;
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%Docstring
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Returns a list of destination parameters definitions utilized by the algorithm.
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.. seealso:: QgsProcessingParameterDefinition.isDestination()
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.. seealso:: parameterDefinitions()
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:rtype: QgsProcessingParameterDefinitions
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%End
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QgsProcessingOutputDefinitions outputDefinitions() const;
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%Docstring
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Returns an ordered list of output definitions utilized by the algorithm.
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.. seealso:: addOutput()
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.. seealso:: outputDefinition()
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:rtype: QgsProcessingOutputDefinitions
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%End
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const QgsProcessingOutputDefinition *outputDefinition( const QString &name ) const;
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%Docstring
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Returns a matching output by ``name``. Matching is done in a case-insensitive
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manner.
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.. seealso:: outputDefinitions()
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:rtype: QgsProcessingOutputDefinition
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%End
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bool hasHtmlOutputs() const;
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%Docstring
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Returns true if this algorithm generates HTML outputs.
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:rtype: bool
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%End
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QVariantMap run( const QVariantMap ¶meters,
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QgsProcessingContext &context, QgsProcessingFeedback *feedback, bool *ok /Out/ = 0 ) const;
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%Docstring
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Executes the algorithm using the specified ``parameters``. This method internally
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creates a copy of the algorithm before running it, so it is safe to call
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on algorithms directly retrieved from QgsProcessingRegistry and QgsProcessingProvider.
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The ``context`` argument specifies the context in which the algorithm is being run.
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Algorithm progress should be reported using the supplied ``feedback`` object.
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If specified, ``ok`` will be set to true if algorithm was successfully run.
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:return: A map of algorithm outputs. These may be output layer references, or calculated
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values such as statistical calculations.
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.. note::
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this method can only be called from the main thread. Use prepare(), runPrepared() and postProcess()
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if you need to run algorithms from a background thread, or use the QgsProcessingAlgRunnerTask class.
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:rtype: QVariantMap
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%End
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bool prepare( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback );
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%Docstring
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Prepares the algorithm for execution. This must be run in the main thread, and allows the algorithm
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to pre-evaluate input parameters in a thread-safe manner. This must be called before
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calling runPrepared() (which is safe to do in any thread).
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.. seealso:: runPrepared()
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.. seealso:: postProcess()
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.. note::
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This method modifies the algorithm instance, so it is not safe to call
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on algorithms directly retrieved from QgsProcessingRegistry and QgsProcessingProvider. Instead, a copy
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of the algorithm should be created with clone() and prepare()/runPrepared() called on the copy.
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:rtype: bool
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%End
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QVariantMap runPrepared( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback );
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%Docstring
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Runs the algorithm, which has been prepared by an earlier call to prepare().
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This method is safe to call from any thread. Returns true if the algorithm was successfully executed.
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After runPrepared() has finished, the postProcess() method should be called from the main thread
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to allow the algorithm to perform any required cleanup tasks and return its final result.
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.. seealso:: prepare()
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.. seealso:: postProcess()
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.. note::
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This method modifies the algorithm instance, so it is not safe to call
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on algorithms directly retrieved from QgsProcessingRegistry and QgsProcessingProvider. Instead, a copy
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of the algorithm should be created with clone() and prepare()/runPrepared() called on the copy.
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:rtype: QVariantMap
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%End
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QVariantMap postProcess( QgsProcessingContext &context, QgsProcessingFeedback *feedback );
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%Docstring
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Should be called in the main thread following the completion of runPrepared(). This method
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allows the algorithm to perform any required cleanup tasks. The returned variant map
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includes the results evaluated by the algorithm.
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.. note::
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This method modifies the algorithm instance, so it is not safe to call
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on algorithms directly retrieved from QgsProcessingRegistry and QgsProcessingProvider. Instead, a copy
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of the algorithm should be created with clone() and prepare()/runPrepared() called on the copy.
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:rtype: QVariantMap
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%End
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virtual QWidget *createCustomParametersWidget( QWidget *parent = 0 ) const /Factory/;
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%Docstring
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If an algorithm subclass implements a custom parameters widget, a copy of this widget
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should be constructed and returned by this method.
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The base class implementation returns None, which indicates that an autogenerated
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parameters widget should be used.
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:rtype: QWidget
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%End
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QgsExpressionContext createExpressionContext( const QVariantMap ¶meters,
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QgsProcessingContext &context ) const;
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%Docstring
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Creates an expression context relating to the algorithm. This can be called by algorithms
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to create a new expression context ready for evaluating expressions within the algorithm.
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:rtype: QgsExpressionContext
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%End
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virtual bool validateInputCrs( const QVariantMap ¶meters,
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QgsProcessingContext &context ) const;
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%Docstring
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Checks whether the coordinate reference systems for the specified set of ``parameters``
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are valid for the algorithm. For instance, the base implementation performs
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checks to ensure that all input CRS are equal
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Returns true if ``parameters`` have passed the CRS check.
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:rtype: bool
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%End
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virtual QString asPythonCommand( const QVariantMap ¶meters, QgsProcessingContext &context ) const;
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%Docstring
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Returns a Python command string which can be executed to run the algorithm
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using the specified ``parameters``.
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Algorithms which cannot be run from a Python command should return an empty
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string.
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:rtype: str
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%End
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void setProvider( QgsProcessingProvider *provider );
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%Docstring
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Associates this algorithm with its provider. No transfer of ownership is involved.
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%End
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protected:
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bool addParameter( QgsProcessingParameterDefinition *parameterDefinition /Transfer/ );
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%Docstring
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Adds a parameter ``definition`` to the algorithm. Ownership of the definition is transferred to the algorithm.
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Returns true if parameter could be successfully added, or false if the parameter could not be added (e.g.
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as a result of a duplicate name).
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.. seealso:: addOutput()
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:rtype: bool
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%End
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void removeParameter( const QString &name );
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%Docstring
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Removes the parameter with matching ``name`` from the algorithm, and deletes any existing
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definition.
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%End
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bool addOutput( QgsProcessingOutputDefinition *outputDefinition /Transfer/ );
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%Docstring
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Adds an output ``definition`` to the algorithm. Ownership of the definition is transferred to the algorithm.
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Returns true if the output could be successfully added, or false if the output could not be added (e.g.
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as a result of a duplicate name).
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.. seealso:: addParameter()
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:rtype: bool
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%End
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virtual bool prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) /VirtualErrorHandler=processing_exception_handler/;
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%Docstring
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Prepares the algorithm to run using the specified ``parameters``. Algorithms should implement
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their logic for evaluating parameter values here. The evaluated parameter results should
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be stored in member variables ready for a call to processAlgorithm().
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The ``context`` argument specifies the context in which the algorithm is being run.
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Algorithm preparation progress should be reported using the supplied ``feedback`` object. Additionally,
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well-behaved algorithms should periodically check ``feedback`` to determine whether the
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algorithm should be canceled and exited early.
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:return: true if preparation was successful.
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.. seealso:: processAlgorithm()
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.. seealso:: postProcessAlgorithm()
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:rtype: bool
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%End
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virtual QVariantMap processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) = 0 /VirtualErrorHandler=processing_exception_handler/;
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%Docstring
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Runs the algorithm using the specified ``parameters``. Algorithms should implement
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their custom processing logic here.
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The ``context`` argument specifies the context in which the algorithm is being run.
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Algorithm progress should be reported using the supplied ``feedback`` object. Additionally,
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well-behaved algorithms should periodically check ``feedback`` to determine whether the
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algorithm should be canceled and exited early.
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:return: A map of algorithm outputs. These may be output layer references, or calculated
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values such as statistical calculations.
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.. seealso:: prepareAlgorithm()
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.. seealso:: postProcessAlgorithm()
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:rtype: QVariantMap
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%End
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virtual QVariantMap postProcessAlgorithm( QgsProcessingContext &context, QgsProcessingFeedback *feedback ) /VirtualErrorHandler=processing_exception_handler/;
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%Docstring
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Allows the algorithm to perform any required cleanup tasks. The returned variant map
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includes the results evaluated by the algorithm. These may be output layer references, or calculated
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values such as statistical calculations.
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The ``context`` argument specifies the context in which the algorithm was run.
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Postprocess progress should be reported using the supplied ``feedback`` object. Additionally,
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well-behaved algorithms should periodically check ``feedback`` to determine whether the
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post processing should be canceled and exited early.
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:return: A map of algorithm outputs. These may be output layer references, or calculated
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values such as statistical calculations.
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.. seealso:: prepareAlgorithm()
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.. seealso:: processAlgorithm()
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:rtype: QVariantMap
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%End
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QString parameterAsString( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a static string value.
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:rtype: str
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%End
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QString parameterAsExpression( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to an expression.
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:rtype: str
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%End
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double parameterAsDouble( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a static double value.
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:rtype: float
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%End
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int parameterAsInt( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a static integer value.
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:rtype: int
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%End
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int parameterAsEnum( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a enum value.
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:rtype: int
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%End
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QList<int> parameterAsEnums( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to list of enum values.
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:rtype: list of int
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%End
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bool parameterAsBool( const QVariantMap ¶meters, const QString &name, const QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a static boolean value.
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:rtype: bool
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%End
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QgsFeatureSink *parameterAsSink( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context, QString &destinationIdentifier /Out/,
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const QgsFields &fields, QgsWkbTypes::Type geometryType = QgsWkbTypes::NoGeometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem() ) const /Factory/;
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%Docstring
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Evaluates the parameter with matching ``name`` to a feature sink.
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Sinks will either be taken from ``context``'s active project, or created from external
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providers and stored temporarily in the ``context``.
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The ``fields``, ``geometryType`` and ``crs`` parameters dictate the properties
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of the resulting feature sink.
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The ``destinationIdentifier`` argument will be set to a string which can be used to retrieve the layer corresponding
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to the sink, e.g. via calling QgsProcessingUtils.mapLayerFromString().
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This function creates a new object and the caller takes responsibility for deleting the returned object.
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:rtype: QgsFeatureSink
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%End
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QgsProcessingFeatureSource *parameterAsSource( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const /Factory/;
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%Docstring
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Evaluates the parameter with matching ``definition`` to a feature source.
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Sources will either be taken from ``context``'s active project, or loaded from external
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sources and stored temporarily in the ``context``.
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This function creates a new object and the caller takes responsibility for deleting the returned object.
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:rtype: QgsProcessingFeatureSource
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%End
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QgsMapLayer *parameterAsLayer( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a map layer.
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Layers will either be taken from ``context``'s active project, or loaded from external
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sources and stored temporarily in the ``context``. In either case, callers do not
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need to handle deletion of the returned layer.
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:rtype: QgsMapLayer
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%End
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QgsRasterLayer *parameterAsRasterLayer( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a raster layer.
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Layers will either be taken from ``context``'s active project, or loaded from external
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sources and stored temporarily in the ``context``. In either case, callers do not
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need to handle deletion of the returned layer.
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:rtype: QgsRasterLayer
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%End
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QString parameterAsRasterOutputLayer( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a raster output layer destination.
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:rtype: str
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%End
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QString parameterAsFileOutput( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a file based output destination.
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:rtype: str
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%End
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QgsVectorLayer *parameterAsVectorLayer( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
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Evaluates the parameter with matching ``name`` to a vector layer.
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Layers will either be taken from ``context``'s active project, or loaded from external
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sources and stored temporarily in the ``context``. In either case, callers do not
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need to handle deletion of the returned layer.
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:rtype: QgsVectorLayer
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%End
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QgsCoordinateReferenceSystem parameterAsCrs( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
|
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Evaluates the parameter with matching ``name`` to a coordinate reference system.
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:rtype: QgsCoordinateReferenceSystem
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%End
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QgsRectangle parameterAsExtent( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
|
|
Evaluates the parameter with matching ``name`` to a rectangular extent.
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:rtype: QgsRectangle
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%End
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QgsPointXY parameterAsPoint( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
|
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%Docstring
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Evaluates the parameter with matching ``name`` to a point.
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:rtype: QgsPointXY
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%End
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QString parameterAsFile( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
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%Docstring
|
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Evaluates the parameter with matching ``name`` to a file/folder name.
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:rtype: str
|
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%End
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QVariantList parameterAsMatrix( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
|
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%Docstring
|
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Evaluates the parameter with matching ``name`` to a matrix/table of values.
|
|
Tables are collapsed to a 1 dimensional list.
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:rtype: QVariantList
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|
%End
|
|
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QList< QgsMapLayer *> parameterAsLayerList( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
|
|
%Docstring
|
|
Evaluates the parameter with matching ``name`` to a list of map layers.
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:rtype: list of QgsMapLayer
|
|
%End
|
|
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QList<double> parameterAsRange( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
|
|
%Docstring
|
|
Evaluates the parameter with matching ``name`` to a range of values.
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|
:rtype: list of float
|
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%End
|
|
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|
QStringList parameterAsFields( const QVariantMap ¶meters, const QString &name, QgsProcessingContext &context ) const;
|
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%Docstring
|
|
Evaluates the parameter with matching ``name`` to a list of fields.
|
|
:rtype: list of str
|
|
%End
|
|
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private:
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QgsProcessingAlgorithm( const QgsProcessingAlgorithm &other );
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};
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QFlags<QgsProcessingAlgorithm::Flag> operator|(QgsProcessingAlgorithm::Flag f1, QFlags<QgsProcessingAlgorithm::Flag> f2);
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/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/processing/qgsprocessingalgorithm.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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