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113 lines
4.0 KiB
Python
113 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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AlgorithmExecutor.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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from builtins import str
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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 sys
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from qgis.PyQt.QtCore import QCoreApplication
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from qgis.core import (QgsFeature,
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QgsVectorFileWriter,
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QgsProcessingFeedback,
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QgsSettings,
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QgsProcessingUtils,
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QgsMessageLog)
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.gui.Postprocessing import handleAlgorithmResults
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from processing.tools import dataobjects
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from processing.tools.system import getTempFilename
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def execute(alg, context=None, feedback=None):
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"""Executes a given algorithm, showing its progress in the
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progress object passed along.
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Return true if everything went OK, false if the algorithm
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could not be completed.
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"""
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if feedback is None:
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feedback = QgsProcessingFeedback()
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if context is None:
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context = dataobjects.createContext()
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try:
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alg.execute(context, feedback)
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return True
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except GeoAlgorithmExecutionException as e:
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QgsMessageLog.logMessage(str(sys.exc_info()[0]), 'Processing', QgsMessageLog.CRITICAL)
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if feedback is not None:
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feedback.reportError(e.msg)
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return False
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def executeIterating(alg, paramToIter, context, feedback):
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# Generate all single-feature layers
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settings = QgsSettings()
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systemEncoding = settings.value('/UI/encoding', 'System')
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layerfile = alg.getParameterValue(paramToIter)
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layer = QgsProcessingUtils.mapLayerFromString(layerfile, context, False)
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feat = QgsFeature()
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filelist = []
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outputs = {}
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features = QgsProcessingUtils.getFeatures(layer, context)
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for feat in features:
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output = getTempFilename('shp')
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filelist.append(output)
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writer = QgsVectorFileWriter(output, systemEncoding,
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layer.fields(), layer.wkbType(), layer.crs())
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writer.addFeature(feat)
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del writer
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# store output values to use them later as basenames for all outputs
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for out in alg.outputs:
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outputs[out.name] = out.value
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# now run all the algorithms
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for i, f in enumerate(filelist):
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alg.setParameterValue(paramToIter, f)
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for out in alg.outputs:
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filename = outputs[out.name]
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if filename:
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filename = filename[:filename.rfind('.')] + '_' + str(i) \
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+ filename[filename.rfind('.'):]
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out.value = filename
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feedback.setProgressText(tr('Executing iteration {0}/{1}...').format(i, len(filelist)))
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feedback.setProgress(i * 100 / len(filelist))
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if execute(alg, None, feedback):
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handleAlgorithmResults(alg, context, None, False)
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else:
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return False
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return True
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def tr(string, context=''):
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if context == '':
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context = 'AlgorithmExecutor'
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return QCoreApplication.translate(context, string)
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