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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
116 lines
4.2 KiB
Python
116 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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QgsProcessingParameterFolderDestination,
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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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def initAlgorithm(self, config=None):
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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(QgsProcessingParameterFolderDestination(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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