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99cfb8faf3
Instead we output an empty layer - this may be critical for multi-step models where there is validly no features present in a source layer
122 lines
4.5 KiB
Python
122 lines
4.5 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.PyQt.QtGui import QIcon
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from qgis.core import (QgsProcessingUtils,
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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.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputDirectory
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from processing.tools import vector
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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 icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'split_layer.png'))
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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)
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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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