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95 lines
3.8 KiB
Python
95 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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UnthreadedAlgorithmExecutor.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 processing.tools.vector import getfeatures
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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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from PyQt4.QtGui import *
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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.QGisLayers import QGisLayers
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from processing.core.ProcessingUtils import ProcessingUtils
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from processing.gui.Postprocessing import Postprocessing
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from processing.core.SilentProgress import SilentProgress
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import traceback
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class UnthreadedAlgorithmExecutor:
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@staticmethod
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def runalg(alg, progress):
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'''Executes a given algorithm, showing its progress in the progress object passed along.
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Return true if everything went OK, false if the algorithm could not be completed'''
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try:
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alg.execute(progress)
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return True
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except GeoAlgorithmExecutionException, e :
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QMessageBox.critical(None, "Error", e.msg)
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return False
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except Exception:
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QMessageBox.critical(None, "Uncaught error", traceback.format_exc())
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return False
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@staticmethod
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def runalgIterating(alg,paramToIter,progress):
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#generate all single-feature layers
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settings = QSettings()
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systemEncoding = settings.value( "/UI/encoding", "System" )
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layerfile = alg.getParameterValue(paramToIter)
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layer = QGisLayers.getObjectFromUri(layerfile, False)
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feat = QgsFeature()
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filelist = []
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outputs = {}
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provider = layer.dataProvider()
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features = getfeatures(layer)
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for feat in features:
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output = ProcessingUtils.getTempFilename("shp")
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filelist.append(output)
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writer = QgsVectorFileWriter(output, systemEncoding, provider.fields(), provider.geometryType(), 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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i = 1
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for f in 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) + filename[filename.rfind("."):]
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out.value = filename
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progress.setText("Executing iteration " + str(i) + "/" + str(len(filelist)) + "...")
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progress.setPercentage((i * 100) / len(filelist))
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if UnthreadedAlgorithmExecutor.runalg(alg, SilentProgress()):
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Postprocessing.handleAlgorithmResults(alg, progress, False)
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i+=1
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else:
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return False;
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return True
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