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83 lines
3.5 KiB
Python
83 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SelectByExpression.py
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---------------------
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Date : July 2014
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Copyright : (C) 2014 by Michael Douchin
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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 Douchin'
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__date__ = 'July 2014'
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__copyright__ = '(C) 2014, Michael Douchin'
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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 QgsExpression, QgsVectorLayer
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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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.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterExpression
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from processing.tools import dataobjects
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class SelectByExpression(GeoAlgorithm):
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LAYERNAME = 'LAYERNAME'
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EXPRESSION = 'EXPRESSION'
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RESULT = 'RESULT'
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METHOD = 'METHOD'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Select by expression')
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self.group, self.i18n_group = self.trAlgorithm('Vector selection tools')
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self.methods = [self.tr('creating new selection'),
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self.tr('adding to current selection'),
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self.tr('removing from current selection'),
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self.tr('selecting within current selection')]
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self.addParameter(ParameterVector(self.LAYERNAME,
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self.tr('Input Layer')))
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self.addParameter(ParameterExpression(self.EXPRESSION,
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self.tr("Expression"), parent_layer=self.LAYERNAME))
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self.addParameter(ParameterSelection(self.METHOD,
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self.tr('Modify current selection by'), self.methods, 0))
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self.addOutput(OutputVector(self.RESULT, self.tr('Selected (expression)'), True))
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def processAlgorithm(self, feedback):
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filename = self.getParameterValue(self.LAYERNAME)
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layer = dataobjects.getObjectFromUri(filename)
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oldSelection = set(layer.selectedFeatureIds())
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method = self.getParameterValue(self.METHOD)
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if method == 0:
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behavior = QgsVectorLayer.SetSelection
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elif method == 1:
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behavior = QgsVectorLayer.AddToSelection
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elif method == 2:
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behavior = QgsVectorLayer.RemoveFromSelection
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elif method == 3:
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behavior = QgsVectorLayer.IntersectSelection
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expression = self.getParameterValue(self.EXPRESSION)
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qExp = QgsExpression(expression)
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if qExp.hasParserError():
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raise GeoAlgorithmExecutionException(qExp.parserErrorString())
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layer.selectByExpression(expression, behavior)
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self.setOutputValue(self.RESULT, filename)
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