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# -*- coding: utf-8 -*-
"""
***************************************************************************
QgisAlgorithmTests.py
---------------------
Date : January 2019
Copyright : (C) 2019 by Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Nyall Dawson'
__date__ = 'January 2019'
__copyright__ = '(C) 2019, Nyall Dawson'
import nose2
import shutil
import gc
from qgis.core import (QgsApplication,
QgsProcessing,
QgsProcessingContext,
QgsVectorLayer,
QgsProject)
from qgis.PyQt import sip
from qgis.analysis import (QgsNativeAlgorithms)
from qgis.testing import start_app, unittest
import processing
from processing.tests.TestData import points
class TestProcessingGeneral(unittest.TestCase):
@classmethod
def setUpClass(cls):
start_app()
from processing.core.Processing import Processing
Processing.initialize()
QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())
cls.cleanup_paths = []
cls.in_place_layers = {}
cls.vector_layer_params = {}
@classmethod
def tearDownClass(cls):
from processing.core.Processing import Processing
Processing.deinitialize()
for path in cls.cleanup_paths:
shutil.rmtree(path)
def testRun(self):
context = QgsProcessingContext()
# try running an alg using processing.run - ownership of result layer should be transferred back to the caller
res = processing.run('qgis:buffer',
{'DISTANCE': 1, 'INPUT': points(), 'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT},
context=context)
self.assertIn('OUTPUT', res)
# output should be the layer instance itself
self.assertIsInstance(res['OUTPUT'], QgsVectorLayer)
# Python should have ownership
self.assertTrue(sip.ispyowned(res['OUTPUT']))
del context
gc.collect()
self.assertFalse(sip.isdeleted(res['OUTPUT']))
# now try using processing.run with is_child_algorithm = True. Ownership should remain with the context
context = QgsProcessingContext()
res = processing.run('qgis:buffer',
{'DISTANCE': 1, 'INPUT': points(), 'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT},
context=context, is_child_algorithm=True)
self.assertIn('OUTPUT', res)
# output should be a layer string reference, NOT the layer itself
self.assertIsInstance(res['OUTPUT'], str)
layer = context.temporaryLayerStore().mapLayer(res['OUTPUT'])
self.assertIsInstance(layer, QgsVectorLayer)
# context should have ownership
self.assertFalse(sip.ispyowned(layer))
del context
gc.collect()
self.assertTrue(sip.isdeleted(layer))
def testRunAndLoadResults(self):
QgsProject.instance().removeAllMapLayers()
context = QgsProcessingContext()
# try running an alg using processing.runAndLoadResults - ownership of result layer should be transferred to
# project, and layer should be present in project
res = processing.runAndLoadResults('qgis:buffer',
{'DISTANCE': 1, 'INPUT': points(), 'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT},
context=context)
self.assertIn('OUTPUT', res)
# output should be the layer path
self.assertIsInstance(res['OUTPUT'], str)
self.assertEqual(context.layersToLoadOnCompletion()[res['OUTPUT']].project, QgsProject.instance())
layer = QgsProject.instance().mapLayer(res['OUTPUT'])
self.assertIsInstance(layer, QgsVectorLayer)
# Python should NOT have ownership
self.assertFalse(sip.ispyowned(layer))
if __name__ == '__main__':
nose2.main()
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