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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
113 lines
4.4 KiB
Python
113 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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AddTableField.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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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from qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsField,
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QgsFeature,
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QgsApplication,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterString
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterSelection
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class AddTableField(GeoAlgorithm):
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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INPUT_LAYER = 'INPUT_LAYER'
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FIELD_NAME = 'FIELD_NAME'
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FIELD_TYPE = 'FIELD_TYPE'
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FIELD_LENGTH = 'FIELD_LENGTH'
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FIELD_PRECISION = 'FIELD_PRECISION'
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TYPES = [QVariant.Int, QVariant.Double, QVariant.String]
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector table tools')
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def name(self):
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return 'addfieldtoattributestable'
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def displayName(self):
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return self.tr('Add field to attributes table')
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def defineCharacteristics(self):
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self.type_names = [self.tr('Integer'),
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self.tr('Float'),
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self.tr('String')]
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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self.addParameter(ParameterString(self.FIELD_NAME,
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self.tr('Field name')))
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self.addParameter(ParameterSelection(self.FIELD_TYPE,
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self.tr('Field type'), self.type_names))
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self.addParameter(ParameterNumber(self.FIELD_LENGTH,
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self.tr('Field length'), 1, 255, 10))
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self.addParameter(ParameterNumber(self.FIELD_PRECISION,
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self.tr('Field precision'), 0, 10, 0))
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self.addOutput(OutputVector(
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self.OUTPUT_LAYER, self.tr('Added')))
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def processAlgorithm(self, context, feedback):
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fieldType = self.getParameterValue(self.FIELD_TYPE)
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fieldName = self.getParameterValue(self.FIELD_NAME)
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fieldLength = self.getParameterValue(self.FIELD_LENGTH)
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fieldPrecision = self.getParameterValue(self.FIELD_PRECISION)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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layer = dataobjects.getLayerFromString(
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self.getParameterValue(self.INPUT_LAYER))
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fields = layer.fields()
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fields.append(QgsField(fieldName, self.TYPES[fieldType], '',
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fieldLength, fieldPrecision))
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writer = output.getVectorWriter(fields, layer.wkbType(), layer.crs(), context)
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outFeat = QgsFeature()
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
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for current, feat in enumerate(features):
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feedback.setProgress(int(current * total))
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geom = feat.geometry()
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outFeat.setGeometry(geom)
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atMap = feat.attributes()
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atMap.append(None)
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outFeat.setAttributes(atMap)
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writer.addFeature(outFeat)
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del writer
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