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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
97 lines
2.8 KiB
Python
97 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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QgisAlgorithmTests.py
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---------------------
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Date : January 2016
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Copyright : (C) 2016 by Matthias Kuhn
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Email : matthias@opengis.ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Matthias Kuhn'
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__date__ = 'January 2016'
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__copyright__ = '(C) 2016, Matthias Kuhn'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = ':%H$'
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import AlgorithmsTestBase
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import nose2
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import shutil
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from qgis.core import (QgsProcessingAlgorithm,
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QgsProcessingFeedback)
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from qgis.testing import start_app, unittest
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.tools.dataobjects import createContext
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class TestAlg(QgsProcessingAlgorithm):
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def __init__(self):
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super().__init__()
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def name(self):
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return 'testalg'
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def displayName(self):
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return 'testalg'
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def initAlgorithm(self):
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pass
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def createInstance(self):
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return TestAlg()
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def processAlgorithm(self, parameters, context, feedback):
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raise GeoAlgorithmExecutionException('Exception while processing')
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return {}
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class TestQgisAlgorithms(unittest.TestCase, AlgorithmsTestBase.AlgorithmsTest):
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@classmethod
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def setUpClass(cls):
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start_app()
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from processing.core.Processing import Processing
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Processing.initialize()
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cls.cleanup_paths = []
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cls.in_place_layers = {}
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cls.vector_layer_params = {}
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@classmethod
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def tearDownClass(cls):
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from processing.core.Processing import Processing
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Processing.deinitialize()
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for path in cls.cleanup_paths:
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shutil.rmtree(path)
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def test_definition_file(self):
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return 'qgis_algorithm_tests.yaml'
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def testProcessingException(self):
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"""
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Test that Python exception is caught when running an alg
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"""
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alg = TestAlg()
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context = createContext()
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feedback = QgsProcessingFeedback()
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results, ok = alg.run({}, context, feedback)
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self.assertFalse(ok)
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if __name__ == '__main__':
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nose2.main()
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