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80 lines
3.2 KiB
Python
80 lines
3.2 KiB
Python
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# -*- 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 Micha<EFBFBD>l 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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import processing
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from qgis.core import *
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.parameters.ParameterVector import ParameterVector
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from processing.parameters.ParameterSelection import ParameterSelection
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from processing.outputs.OutputVector import OutputVector
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.parameters.ParameterString import ParameterString
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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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METHODS = ['creating new selection', 'adding to current selection',
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'removing from current selection']
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def defineCharacteristics(self):
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self.name = 'Select by expression'
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self.group = 'Vector selection tools'
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self.addParameter(ParameterVector(self.LAYERNAME, 'Input Layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterString(self.EXPRESSION, "Expression"))
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self.addParameter(ParameterSelection(self.METHOD,
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'Modify current selection by', self.METHODS, 0))
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self.addOutput(OutputVector(self.RESULT, 'Output', True))
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def processAlgorithm(self, progress):
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filename = self.getParameterValue(self.LAYERNAME)
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layer = processing.getObject(filename)
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oldSelection = set(layer.selectedFeaturesIds())
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method = self.getParameterValue(self.METHOD)
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# Build QGIS request with expression
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expression = self.getParameterValue(self.EXPRESSION)
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qExp = QgsExpression(expression)
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if not qExp.hasParserError():
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qReq = QgsFeatureRequest(qExp)
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else:
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raise GeoAlgorithmExecutionException(qExp.parserErrorString())
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selected = [f.id() for f in layer.getFeatures(qReq)]
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if method == 1:
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selected = list(oldSelection.union(selected))
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elif method == 2:
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selected = list(oldSelection.difference(selected))
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# Set the selection
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layer.setSelectedFeatures(selected)
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self.setOutputValue(self.RESULT, filename)
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