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83 lines
3.3 KiB
Python
83 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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CreateAttributeIndex.py
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-----------------------
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Date : November 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'November 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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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 (QgsVectorDataProvider,
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QgsFields,
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QgsProcessingParameterVectorLayer,
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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 CreateAttributeIndex(QgisAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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OUTPUT = 'OUTPUT'
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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(QgsProcessingParameterVectorLayer(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('Attribute to index'), None, self.INPUT))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Indexed layer')))
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def name(self):
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return 'createattributeindex'
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def displayName(self):
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return self.tr('Create attribute index')
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def processAlgorithm(self, parameters, context, feedback):
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layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
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field = self.parameterAsString(parameters, self.FIELD, context)
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provider = layer.dataProvider()
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field_index = layer.fields().lookupField(field)
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if field_index < 0 or layer.fields().fieldOrigin(field_index) != QgsFields.OriginProvider:
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feedback.pushInfo(self.tr('Can not create attribute index on "{}"').format(field))
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else:
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provider_index = layer.fields().fieldOriginIndex(field_index)
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if provider.capabilities() & QgsVectorDataProvider.CreateAttributeIndex:
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if not provider.createAttributeIndex(provider_index):
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feedback.pushInfo(self.tr('Could not create attribute index'))
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else:
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feedback.pushInfo(self.tr("Layer's data provider does not support "
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"creating attribute indexes"))
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return {self.OUTPUT: layer.id()}
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