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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
115 lines
4.2 KiB
Python
115 lines
4.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VectorSplit.py
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---------------------
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Date : September 2014
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Copyright : (C) 2014 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'September 2014'
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__copyright__ = '(C) 2014, Alexander Bruy'
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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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from qgis.core import (QgsProcessingUtils,
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QgsFeatureSink,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterFolderOutput,
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QgsProcessingOutputFolder,
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QgsExpression,
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QgsFeatureRequest)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.tools.system import mkdir
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class VectorSplit(QgisAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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OUTPUT = 'OUTPUT'
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def group(self):
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return self.tr('Vector general tools')
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def __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Unique ID field'), None, self.INPUT))
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self.addParameter(QgsProcessingParameterFolderOutput(self.OUTPUT,
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self.tr('Output directory')))
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self.addOutput(QgsProcessingOutputFolder(self.OUTPUT, self.tr('Output directory')))
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def name(self):
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return 'splitvectorlayer'
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def displayName(self):
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return self.tr('Split vector layer')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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fieldName = self.parameterAsString(parameters, self.FIELD, context)
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directory = self.parameterAsString(parameters, self.OUTPUT, context)
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mkdir(directory)
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fieldIndex = source.fields().lookupField(fieldName)
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uniqueValues = source.uniqueValues(fieldIndex)
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baseName = os.path.join(directory, '{0}'.format(fieldName))
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fields = source.fields()
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crs = source.sourceCrs()
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geomType = source.wkbType()
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total = 100.0 / len(uniqueValues) if uniqueValues else 1
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for current, i in enumerate(uniqueValues):
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if feedback.isCanceled():
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break
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fName = u'{0}_{1}.shp'.format(baseName, str(i).strip())
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feedback.pushInfo(self.tr('Creating layer: {}').format(fName))
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sink, dest = QgsProcessingUtils.createFeatureSink(fName, context, fields, geomType, crs)
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filter = '{} = {}'.format(QgsExpression.quotedColumnRef(fieldName), QgsExpression.quotedValue(i))
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req = QgsFeatureRequest().setFilterExpression(filter)
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count = 0
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for f in source.getFeatures(req):
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if feedback.isCanceled():
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break
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sink.addFeature(f, QgsFeatureSink.FastInsert)
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count += 1
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feedback.pushInfo(self.tr('Added {} features to layer').format(count))
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del sink
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: directory}
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