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ede452be85
Algorithms are now passed a QgsProcessingFeedback object instead of the loosely defined progress parameter.
87 lines
3.4 KiB
Python
87 lines
3.4 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 QgsFeature
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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 ParameterTableField
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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 DeleteColumn(GeoAlgorithm):
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INPUT = 'INPUT'
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COLUMNS = 'COLUMN'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Delete column')
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self.group, self.i18n_group = self.trAlgorithm('Vector table tools')
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self.tags = self.tr('drop,delete,remove,fields,columns,attributes')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.COLUMNS,
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self.tr('Fields to delete'), self.INPUT, multiple=True))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Output layer')))
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def processAlgorithm(self, feedback):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
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fields_to_delete = self.getParameterValue(self.COLUMNS).split(';')
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fields = layer.fields()
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field_indices = []
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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 fields_to_delete:
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index = fields.lookupField(f)
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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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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 field_indices:
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fields.remove(index)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
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layer.wkbType(), layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, f in enumerate(features):
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attributes = f.attributes()
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for index in field_indices:
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del attributes[index]
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f.setAttributes(attributes)
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writer.addFeature(f)
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feedback.setProgress(int(current * total))
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del writer
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