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199 lines
8.3 KiB
Python
Executable File
199 lines
8.3 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Processing.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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import traceback
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from qgis.PyQt.QtCore import Qt, QCoreApplication
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from qgis.PyQt.QtWidgets import QApplication
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from qgis.PyQt.QtGui import QCursor
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from qgis.utils import iface
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from qgis.core import (QgsMessageLog,
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QgsApplication,
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QgsMapLayer,
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QgsProcessingProvider,
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QgsProcessingAlgorithm,
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QgsProcessingException,
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QgsProcessingParameterDefinition,
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QgsProcessingOutputVectorLayer,
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QgsProcessingOutputRasterLayer)
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import processing
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from processing.script.ScriptUtils import ScriptUtils
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from processing.core.ProcessingConfig import ProcessingConfig
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.gui.MessageBarProgress import MessageBarProgress
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from processing.gui.RenderingStyles import RenderingStyles
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from processing.gui.Postprocessing import handleAlgorithmResults
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from processing.gui.AlgorithmExecutor import execute
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from processing.tools import dataobjects
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from processing.algs.qgis.QGISAlgorithmProvider import QGISAlgorithmProvider # NOQA
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#from processing.algs.grass7.Grass7AlgorithmProvider import Grass7AlgorithmProvider # NOQA
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from processing.algs.gdal.GdalAlgorithmProvider import GdalAlgorithmProvider # NOQA
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#from processing.algs.saga.SagaAlgorithmProvider import SagaAlgorithmProvider # NOQA
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from processing.script.ScriptAlgorithmProvider import ScriptAlgorithmProvider # NOQA
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#from processing.preconfigured.PreconfiguredAlgorithmProvider import PreconfiguredAlgorithmProvider # NOQA
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# should be loaded last - ensures that all dependent algorithms are available when loading models
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from processing.modeler.ModelerAlgorithmProvider import ModelerAlgorithmProvider # NOQA
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class Processing(object):
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BASIC_PROVIDERS = []
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@staticmethod
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def activateProvider(providerOrName, activate=True):
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provider_id = providerOrName.id() if isinstance(providerOrName, QgsProcessingProvider) else providerOrName
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provider = QgsApplication.processingRegistry().providerById(provider_id)
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try:
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provider.setActive(True)
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provider.refreshAlgorithms()
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except:
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# provider could not be activated
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QgsMessageLog.logMessage(Processing.tr('Error: Provider {0} could not be activated\n').format(provider_id),
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Processing.tr("Processing"))
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@staticmethod
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def initialize():
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if "model" in [p.id() for p in QgsApplication.processingRegistry().providers()]:
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return
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# Add the basic providers
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for c in QgsProcessingProvider.__subclasses__():
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p = c()
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Processing.BASIC_PROVIDERS.append(p)
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QgsApplication.processingRegistry().addProvider(p)
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# And initialize
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ProcessingConfig.initialize()
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ProcessingConfig.readSettings()
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RenderingStyles.loadStyles()
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@staticmethod
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def deinitialize():
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for p in Processing.BASIC_PROVIDERS:
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QgsApplication.processingRegistry().removeProvider(p)
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Processing.BASIC_PROVIDERS = []
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@staticmethod
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def addScripts(folder):
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Processing.initialize()
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provider = QgsApplication.processingRegistry().providerById("qgis")
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scripts = ScriptUtils.loadFromFolder(folder)
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# fix_print_with_import
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print(scripts)
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for script in scripts:
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script.allowEdit = False
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script._icon = provider._icon
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provider.externalAlgs.extend(scripts)
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provider.refreshAlgorithms()
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@staticmethod
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def removeScripts(folder):
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provider = QgsApplication.processingRegistry().providerById("qgis")
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for alg in provider.externalAlgs[::-1]:
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path = os.path.dirname(alg.descriptionFile)
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if path == folder:
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provider.externalAlgs.remove(alg)
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provider.refreshAlgorithms()
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@staticmethod
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def runAlgorithm(algOrName, parameters, onFinish=None, feedback=None, context=None):
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if isinstance(algOrName, QgsProcessingAlgorithm):
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alg = algOrName
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else:
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alg = QgsApplication.processingRegistry().createAlgorithmById(algOrName)
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if feedback is None:
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feedback = MessageBarProgress(alg.displayName() if alg else Processing.tr('Processing'))
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if alg is None:
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# fix_print_with_import
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print('Error: Algorithm not found\n')
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msg = Processing.tr('Error: Algorithm {0} not found\n').format(algOrName)
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feedback.reportError(msg)
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raise QgsProcessingException(msg)
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# check for any mandatory parameters which were not specified
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for param in alg.parameterDefinitions():
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if param.name() not in parameters:
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if not param.flags() & QgsProcessingParameterDefinition.FlagOptional:
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# fix_print_with_import
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msg = Processing.tr('Error: Missing parameter value for parameter {0}.').format(param.name())
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print('Error: Missing parameter value for parameter %s.' % param.name())
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feedback.reportError(msg)
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raise QgsProcessingException(msg)
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if context is None:
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context = dataobjects.createContext(feedback)
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ok, msg = alg.checkParameterValues(parameters, context)
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if not ok:
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# fix_print_with_import
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print('Unable to execute algorithm\n' + str(msg))
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msg = Processing.tr('Unable to execute algorithm\n{0}').format(msg)
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feedback.reportError(msg)
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raise QgsProcessingException(msg)
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if not alg.validateInputCrs(parameters, context):
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print('Warning: Not all input layers use the same CRS.\n' +
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'This can cause unexpected results.')
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feedback.pushInfo(
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Processing.tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'))
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ret, results = execute(alg, parameters, context, feedback)
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if ret:
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feedback.pushInfo(
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Processing.tr('Results: {}').format(results))
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if onFinish is not None:
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onFinish(alg, context, feedback)
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else:
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# auto convert layer references in results to map layers
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for out in alg.outputDefinitions():
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if isinstance(out, (QgsProcessingOutputVectorLayer, QgsProcessingOutputRasterLayer)):
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result = results[out.name()]
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if not isinstance(result, QgsMapLayer):
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layer = context.takeResultLayer(result) # transfer layer ownership out of context
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if layer:
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results[out.name()] = layer # replace layer string ref with actual layer (+ownership)
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else:
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msg = Processing.tr("There were errors executing the algorithm.")
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feedback.reportError(msg)
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raise QgsProcessingException(msg)
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if isinstance(feedback, MessageBarProgress):
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feedback.close()
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return results
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@staticmethod
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def tr(string, context=''):
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if context == '':
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context = 'Processing'
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return QCoreApplication.translate(context, string)
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