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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
183 lines
6.3 KiB
Python
183 lines
6.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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CheckValidity.py
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---------------------
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Date : May 2015
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Copyright : (C) 2015 by Arnaud Morvan
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Email : arnaud dot morvan at camptocamp dot com
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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__ = 'Arnaud Morvan'
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__date__ = 'May 2015'
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__copyright__ = '(C) 2015, Arnaud Morvan'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import QgsSettings, QgsGeometry, QgsFeature, QgsField, QgsWkbTypes, QgsProcessingUtils
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterSelection
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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settings_method_key = "/qgis/digitizing/validate_geometries"
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class CheckValidity(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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METHOD = 'METHOD'
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VALID_OUTPUT = 'VALID_OUTPUT'
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INVALID_OUTPUT = 'INVALID_OUTPUT'
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ERROR_OUTPUT = 'ERROR_OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'check_geometry.png'))
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def group(self):
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return self.tr('Vector geometry tools')
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def name(self):
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return 'checkvalidity'
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def displayName(self):
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return self.tr('Check validity')
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def defineCharacteristics(self):
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self.methods = [self.tr('The one selected in digitizing settings'),
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'QGIS',
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'GEOS']
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self.addParameter(ParameterVector(
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self.INPUT_LAYER,
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self.tr('Input layer')))
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self.addParameter(ParameterSelection(
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self.METHOD,
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self.tr('Method'),
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self.methods))
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self.addOutput(OutputVector(
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self.VALID_OUTPUT,
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self.tr('Valid output')))
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self.addOutput(OutputVector(
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self.INVALID_OUTPUT,
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self.tr('Invalid output')))
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self.addOutput(OutputVector(
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self.ERROR_OUTPUT,
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self.tr('Error output')))
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def processAlgorithm(self, context, feedback):
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settings = QgsSettings()
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initial_method_setting = settings.value(settings_method_key, 1)
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method = self.getParameterValue(self.METHOD)
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if method != 0:
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settings.setValue(settings_method_key, method)
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try:
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self.doCheck(context, feedback)
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finally:
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settings.setValue(settings_method_key, initial_method_setting)
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def doCheck(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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settings = QgsSettings()
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method = int(settings.value(settings_method_key, 1))
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valid_output = self.getOutputFromName(self.VALID_OUTPUT)
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valid_fields = layer.fields()
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valid_writer = valid_output.getVectorWriter(valid_fields, layer.wkbType(), layer.crs(), context)
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valid_count = 0
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invalid_output = self.getOutputFromName(self.INVALID_OUTPUT)
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invalid_fields = layer.fields().toList() + [
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QgsField(name='_errors',
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type=QVariant.String,
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len=255)]
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invalid_writer = invalid_output.getVectorWriter(invalid_fields, layer.wkbType(), layer.crs(), context)
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invalid_count = 0
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error_output = self.getOutputFromName(self.ERROR_OUTPUT)
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error_fields = [
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QgsField(name='message',
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type=QVariant.String,
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len=255)]
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error_writer = error_output.getVectorWriter(error_fields, QgsWkbTypes.Point, layer.crs(), context)
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error_count = 0
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
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for current, inFeat in enumerate(features):
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geom = inFeat.geometry()
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attrs = inFeat.attributes()
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valid = True
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if not geom.isNull() and not geom.isEmpty():
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errors = list(geom.validateGeometry())
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if errors:
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# QGIS method return a summary at the end
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if method == 1:
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errors.pop()
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valid = False
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reasons = []
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for error in errors:
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errFeat = QgsFeature()
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error_geom = QgsGeometry.fromPoint(error.where())
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errFeat.setGeometry(error_geom)
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errFeat.setAttributes([error.what()])
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error_writer.addFeature(errFeat)
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error_count += 1
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reasons.append(error.what())
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reason = "\n".join(reasons)
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if len(reason) > 255:
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reason = reason[:252] + '...'
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attrs.append(reason)
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outFeat = QgsFeature()
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outFeat.setGeometry(geom)
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outFeat.setAttributes(attrs)
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if valid:
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valid_writer.addFeature(outFeat)
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valid_count += 1
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else:
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invalid_writer.addFeature(outFeat)
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invalid_count += 1
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feedback.setProgress(int(current * total))
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del valid_writer
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del invalid_writer
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del error_writer
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if valid_count == 0:
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valid_output.open = False
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if invalid_count == 0:
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invalid_output.open = False
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if error_count == 0:
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error_output.open = False
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