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114 lines
4.3 KiB
Python
114 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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DeleteColumn.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn 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__ = 'Michael Minn'
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__date__ = 'May 2010'
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__copyright__ = '(C) 2010, Michael Minn'
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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.core import (QgsApplication,
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QgsFeatureSink,
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QgsProcessingUtils,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterField,
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QgsProcessingOutputVectorLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class DeleteColumn(QgisAlgorithm):
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INPUT = 'INPUT'
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COLUMNS = 'COLUMN'
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OUTPUT = 'OUTPUT'
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def tags(self):
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return self.tr('drop,delete,remove,fields,columns,attributes').split(',')
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def group(self):
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return self.tr('Vector table tools')
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def __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.COLUMNS,
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self.tr('Fields to drop'),
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None, self.INPUT, QgsProcessingParameterField.Any, True))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Output layer')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr("Output layer")))
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self.source = None
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self.fields_to_delete = None
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self.sink = None
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self.dest_id = None
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self.field_indices = []
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def name(self):
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return 'deletecolumn'
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def displayName(self):
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return self.tr('Drop field(s)')
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def prepareAlgorithm(self, parameters, context, feedback):
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self.source = self.parameterAsSource(parameters, self.INPUT, context)
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self.fields_to_delete = self.parameterAsFields(parameters, self.COLUMNS, context)
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fields = self.source.fields()
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# loop through twice - first we need to build up a list of original attribute indices
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for f in self.fields_to_delete:
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index = fields.lookupField(f)
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self.field_indices.append(index)
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# important - make sure we remove from the end so we aren't changing used indices as we go
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self.field_indices.sort(reverse=True)
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# this second time we make a cleaned version of the fields
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for index in self.field_indices:
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fields.remove(index)
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(self.sink, self.dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, self.source.wkbType(), self.source.sourceCrs())
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return True
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def processAlgorithm(self, context, feedback):
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features = self.source.getFeatures()
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total = 100.0 / self.source.featureCount() if self.source.featureCount() else 0
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for current, f in enumerate(features):
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if feedback.isCanceled():
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break
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attributes = f.attributes()
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for index in self.field_indices:
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del attributes[index]
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f.setAttributes(attributes)
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self.sink.addFeature(f, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return True
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def postProcessAlgorithm(self, context, feedback):
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return {self.OUTPUT: self.dest_id}
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