mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-27 00:33:48 -05:00
108 lines
4.1 KiB
Python
108 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
UnthreadedAlgorithmExecutor.py
|
|
---------------------
|
|
Date : August 2012
|
|
Copyright : (C) 2012 by Victor Olaya
|
|
Email : volayaf 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__ = 'Victor Olaya'
|
|
__date__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from PyQt4.QtGui import *
|
|
from PyQt4.QtCore import *
|
|
from qgis.core import *
|
|
from processing.core.SilentProgress import SilentProgress
|
|
from processing.core.ProcessingLog import ProcessingLog
|
|
from processing.core.GeoAlgorithmExecutionException import \
|
|
GeoAlgorithmExecutionException
|
|
from processing.gui.Postprocessing import handleAlgorithmResults
|
|
from processing.tools import dataobjects
|
|
from processing.tools.system import *
|
|
from processing.tools import vector
|
|
|
|
|
|
class UnthreadedAlgorithmExecutor:
|
|
|
|
@staticmethod
|
|
def runalg(alg, progress):
|
|
"""Executes a given algorithm, showing its progress in the
|
|
progress object passed along.
|
|
|
|
Return true if everything went OK, false if the algorithm
|
|
could not be completed.
|
|
"""
|
|
|
|
try:
|
|
alg.execute(progress)
|
|
return True
|
|
except GeoAlgorithmExecutionException, e:
|
|
ProcessingLog.addToLog(sys.exc_info()[0], ProcessingLog.LOG_ERROR)
|
|
progress.error(e.msg)
|
|
return False
|
|
except Exception:
|
|
msg = 'Uncaught error executing ' + str(alg.name) \
|
|
+ '\nSee log for more information'
|
|
ProcessingLog.addToLog(sys.exc_info()[0], ProcessingLog.LOG_ERROR)
|
|
progress.error(msg)
|
|
return False
|
|
|
|
@staticmethod
|
|
def runalgIterating(alg, paramToIter, progress):
|
|
# Generate all single-feature layers
|
|
settings = QSettings()
|
|
systemEncoding = settings.value('/UI/encoding', 'System')
|
|
layerfile = alg.getParameterValue(paramToIter)
|
|
layer = dataobjects.getObjectFromUri(layerfile, False)
|
|
feat = QgsFeature()
|
|
filelist = []
|
|
outputs = {}
|
|
provider = layer.dataProvider()
|
|
features = vector.features(layer)
|
|
for feat in features:
|
|
output = getTempFilename('shp')
|
|
filelist.append(output)
|
|
writer = QgsVectorFileWriter(output, systemEncoding,
|
|
provider.fields(), provider.geometryType(), layer.crs())
|
|
writer.addFeature(feat)
|
|
del writer
|
|
|
|
# store output values to use them later as basenames for all outputs
|
|
for out in alg.outputs:
|
|
outputs[out.name] = out.value
|
|
|
|
# now run all the algorithms
|
|
for i,f in enumerate(filelist):
|
|
alg.setParameterValue(paramToIter, f)
|
|
for out in alg.outputs:
|
|
filename = outputs[out.name]
|
|
if filename:
|
|
filename = filename[:filename.rfind('.')] + '_' + str(i) \
|
|
+ filename[filename.rfind('.'):]
|
|
out.value = filename
|
|
progress.setText('Executing iteration ' + str(i) + '/'
|
|
+ str(len(filelist)) + '...')
|
|
progress.setPercentage(i * 100 / len(filelist))
|
|
if UnthreadedAlgorithmExecutor.runalg(alg, SilentProgress()):
|
|
handleAlgorithmResults(alg, SilentProgress(), False)
|
|
else:
|
|
return False
|
|
|
|
return True
|