QGIS API Documentation  3.26.3-Buenos Aires (65e4edfdad)
qgsalgorithmfilter.h
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1 /***************************************************************************
2  qgsalgorithmfilter.h
3  ---------------------
4  begin : April 2018
5  copyright : (C) 2018 by Matthias Kuhn
6  email : [email protected]
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSFILTERALGORITHM_H
19 #define QGSFILTERALGORITHM_H
20 
21 #define SIP_NO_FILE
22 
23 #include "qgis_sip.h"
24 #include "qgsprocessingalgorithm.h"
25 
26 class QgsProcessingModelAlgorithm;
27 class QTableWidget;
28 
30 
38 class QgsFilterAlgorithm : public QgsProcessingAlgorithm
39 {
40  public:
41  QgsFilterAlgorithm() = default;
42  ~QgsFilterAlgorithm() override;
43 
44  void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
45  QString name() const override;
46  QString displayName() const override;
47  QStringList tags() const override;
48  QString group() const override;
49  QString groupId() const override;
50  Flags flags() const override;
51  QString shortHelpString() const override;
52  QgsFilterAlgorithm *createInstance() const override SIP_FACTORY;
53 
54  protected:
55 
56  QVariantMap processAlgorithm( const QVariantMap &parameters,
57  QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
58 
59  private:
60  struct Output
61  {
62  Output( const QString &name, const QString &expression )
63  : name( name )
64  , expression( expression )
65  {}
66  QString name;
67  QgsExpression expression;
68  std::unique_ptr< QgsFeatureSink > sink;
69  QString destinationIdentifier;
70  };
71 
72  QList<Output *> mOutputs;
73 };
74 
76 
77 #endif // QGSFILTERALGORITHM_H
QgsProcessingAlgorithm::displayName
virtual QString displayName() const =0
Returns the translated algorithm name, which should be used for any user-visible display of the algor...
QgsProcessingFeedback
Base class for providing feedback from a processing algorithm.
Definition: qgsprocessingfeedback.h:37
QgsProcessingAlgorithm::groupId
virtual QString groupId() const
Returns the unique ID of the group this algorithm belongs to.
Definition: qgsprocessingalgorithm.h:234
QgsProcessingAlgorithm::createInstance
virtual QgsProcessingAlgorithm * createInstance() const =0
Creates a new instance of the algorithm class.
SIP_FACTORY
#define SIP_FACTORY
Definition: qgis_sip.h:76
QgsProcessingAlgorithm::name
virtual QString name() const =0
Returns the algorithm name, used for identifying the algorithm.
QgsProcessingContext
Contains information about the context in which a processing algorithm is executed.
Definition: qgsprocessingcontext.h:46
qgsprocessingalgorithm.h
qgis_sip.h
QgsProcessingAlgorithm::shortHelpString
virtual QString shortHelpString() const
Returns a localised short helper string for the algorithm.
Definition: qgsprocessingalgorithm.cpp:65
QgsProcessingAlgorithm
Abstract base class for processing algorithms.
Definition: qgsprocessingalgorithm.h:52
QgsProcessingAlgorithm::group
virtual QString group() const
Returns the name of the group this algorithm belongs to.
Definition: qgsprocessingalgorithm.h:225
QgsProcessingAlgorithm::flags
virtual Flags flags() const
Returns the flags indicating how and when the algorithm operates and should be exposed to users.
Definition: qgsprocessingalgorithm.cpp:90
QgsExpression
Class for parsing and evaluation of expressions (formerly called "search strings")....
Definition: qgsexpression.h:102
QgsProcessingAlgorithm::tags
virtual QStringList tags() const
Returns a list of tags which relate to the algorithm, and are used to assist users in searching for s...
Definition: qgsprocessingalgorithm.h:181
QgsProcessingAlgorithm::initAlgorithm
virtual void initAlgorithm(const QVariantMap &configuration=QVariantMap())=0
Initializes the algorithm using the specified configuration.