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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
91 lines
3.6 KiB
Python
91 lines
3.6 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 (QgsApplication,
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QgsExpression,
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QgsVectorLayer,
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QgsProcessingUtils)
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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.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.parameters import ParameterExpression
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class SelectByExpression(QgisAlgorithm):
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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 group(self):
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return self.tr('Vector selection tools')
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def __init__(self):
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super().__init__()
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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 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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filename = self.getParameterValue(self.LAYERNAME)
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layer = QgsProcessingUtils.mapLayerFromString(filename, context)
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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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