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138 lines
5.5 KiB
Python
138 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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FieldsMapper.py
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---------------------
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Date : October 2014
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Copyright : (C) 2014 by Arnaud Morvan
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Email : arnaud dot morvan at camptocamp 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__ = 'Arnaud Morvan'
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__date__ = 'October 2014'
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__copyright__ = '(C) 2014, Arnaud Morvan'
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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 QgsField, QgsExpression, QgsFeature
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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.outputs import OutputVector
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from processing.tools import dataobjects, vector
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from .fieldsmapping import ParameterFieldsMapping
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from .ui.FieldsMapperDialogs import (FieldsMapperParametersDialog,
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FieldsMapperModelerParametersDialog)
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class FieldsMapper(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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FIELDS_MAPPING = 'FIELDS_MAPPING'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def __init__(self):
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GeoAlgorithm.__init__(self)
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self.mapping = None
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Refactor fields')
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self.group, self.i18n_group = self.trAlgorithm('Vector table tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'),
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[ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterFieldsMapping(self.FIELDS_MAPPING,
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self.tr('Fields mapping'), self.INPUT_LAYER))
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self.addOutput(OutputVector(self.OUTPUT_LAYER,
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self.tr('Refactored')))
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def getCustomParametersDialog(self):
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return FieldsMapperParametersDialog(self)
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def getCustomModelerParametersDialog(self, modelAlg, algName=None):
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return FieldsMapperModelerParametersDialog(self, modelAlg, algName)
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def processAlgorithm(self, progress):
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layer = self.getParameterValue(self.INPUT_LAYER)
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mapping = self.getParameterValue(self.FIELDS_MAPPING)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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layer = dataobjects.getObjectFromUri(layer)
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provider = layer.dataProvider()
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fields = []
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expressions = []
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for field_def in mapping:
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fields.append(QgsField(name=field_def['name'],
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type=field_def['type'],
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len=field_def['length'],
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prec=field_def['precision']))
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expression = QgsExpression(field_def['expression'])
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if expression.hasParserError():
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raise GeoAlgorithmExecutionException(
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self.tr(u'Parser error in expression "{}": {}')
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.format(unicode(field_def['expression']),
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unicode(expression.parserErrorString())))
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expression.prepare(provider.fields())
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if expression.hasEvalError():
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raise GeoAlgorithmExecutionException(
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self.tr(u'Evaluation error in expression "{}": {}')
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.format(unicode(field_def['expression']),
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unicode(expression.evalErrorString())))
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expressions.append(expression)
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writer = output.getVectorWriter(fields,
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provider.geometryType(),
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layer.crs())
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# Create output vector layer with new attributes
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error = ''
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calculationSuccess = True
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inFeat = QgsFeature()
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outFeat = QgsFeature()
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features = vector.features(layer)
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count = len(features)
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for current, inFeat in enumerate(features):
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rownum = current + 1
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outFeat.setGeometry(inFeat.geometry())
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attrs = []
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for i in xrange(0, len(mapping)):
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field_def = mapping[i]
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expression = expressions[i]
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expression.setCurrentRowNumber(rownum)
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value = expression.evaluate(inFeat)
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if expression.hasEvalError():
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calculationSuccess = False
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error = expression.evalErrorString()
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break
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attrs.append(value)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(100 * current / float(count))
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del writer
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if not calculationSuccess:
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raise GeoAlgorithmExecutionException(
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self.tr('An error occurred while evaluating the calculation'
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' string:\n') + error)
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