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100 lines
3.8 KiB
Python
100 lines
3.8 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,
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QgsProcessing,
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QgsVectorLayer,
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QgsProcessingAlgorithm,
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QgsProcessingException,
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QgsProcessingParameterVectorLayer,
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QgsProcessingParameterExpression,
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QgsProcessingParameterEnum,
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QgsProcessingOutputVectorLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class SelectByExpression(QgisAlgorithm):
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INPUT = 'INPUT'
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EXPRESSION = 'EXPRESSION'
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OUTPUT = 'OUTPUT'
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METHOD = 'METHOD'
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def group(self):
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return self.tr('Vector selection')
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def groupId(self):
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return 'vectorselection'
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def __init__(self):
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super().__init__()
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def flags(self):
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return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
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def initAlgorithm(self, config=None):
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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(QgsProcessingParameterVectorLayer(self.INPUT, self.tr('Input layer'), types=[QgsProcessing.TypeVector]))
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self.addParameter(QgsProcessingParameterExpression(self.EXPRESSION,
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self.tr('Expression'), parentLayerParameterName=self.INPUT))
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self.addParameter(QgsProcessingParameterEnum(self.METHOD,
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self.tr('Modify current selection by'), self.methods, 0))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Selected (attribute)')))
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def name(self):
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return 'selectbyexpression'
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def displayName(self):
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return self.tr('Select by expression')
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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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method = self.parameterAsEnum(parameters, self.METHOD, context)
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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.parameterAsString(parameters, self.EXPRESSION, context)
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qExp = QgsExpression(expression)
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if qExp.hasParserError():
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raise QgsProcessingException(qExp.parserErrorString())
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layer.selectByExpression(expression, behavior)
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return {self.OUTPUT: parameters[self.INPUT]}
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