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90bac82f12
in vector split algorithm The created outputs will now be created using the format specified from the Processing setting default vector format setting.
133 lines
5.0 KiB
Python
133 lines
5.0 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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__author__ = 'Alexander Bruy'
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__date__ = 'September 2014'
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__copyright__ = '(C) 2014, Alexander Bruy'
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import os
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from qgis.core import (QgsApplication,
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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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QgsProcessingException,
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QgsProcessingOutputMultipleLayers,
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QgsExpression,
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QgsFeatureRequest,
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QgsVectorFileWriter)
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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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OUTPUT_LAYERS = 'OUTPUT_LAYERS'
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def group(self):
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return self.tr('Vector general')
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def groupId(self):
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return 'vectorgeneral'
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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(QgsProcessingOutputMultipleLayers(self.OUTPUT_LAYERS, self.tr('Output layers')))
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmSplitLayer.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmSplitLayer.svg")
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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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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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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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output_format = context.preferredVectorFormat()
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if not output_format in QgsVectorFileWriter.supportedFormatExtensions():
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# fallback to gpkg if preferred format is not available
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output_format = 'gpkg'
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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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output_layers = []
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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 = '{0}_{1}.{2}'.format(baseName, str(i).strip(), output_format)
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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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output_layers.append(fName)
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del sink
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: directory, self.OUTPUT_LAYERS: output_layers}
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