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Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
105 lines
4.3 KiB
Python
105 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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JoinAttributes.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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 os
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from qgis.core import QgsFeature
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTable
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class JoinAttributes(GeoAlgorithm):
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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INPUT_LAYER = 'INPUT_LAYER'
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INPUT_LAYER_2 = 'INPUT_LAYER_2'
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TABLE_FIELD = 'TABLE_FIELD'
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TABLE_FIELD_2 = 'TABLE_FIELD_2'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Join attributes table')
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self.group, self.i18n_group = self.trAlgorithm('Vector general tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterTable(self.INPUT_LAYER_2,
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self.tr('Input layer 2'), False))
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self.addParameter(ParameterTableField(self.TABLE_FIELD,
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self.tr('Table field'), self.INPUT_LAYER))
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self.addParameter(ParameterTableField(self.TABLE_FIELD_2,
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self.tr('Table field 2'), self.INPUT_LAYER_2))
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self.addOutput(OutputVector(self.OUTPUT_LAYER,
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self.tr('Joined layer')))
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def processAlgorithm(self, progress):
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input = self.getParameterValue(self.INPUT_LAYER)
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input2 = self.getParameterValue(self.INPUT_LAYER_2)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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field = self.getParameterValue(self.TABLE_FIELD)
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field2 = self.getParameterValue(self.TABLE_FIELD_2)
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layer = dataobjects.getObjectFromUri(input)
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joinField1Index = layer.fieldNameIndex(field)
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layer2 = dataobjects.getObjectFromUri(input2)
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joinField2Index = layer2.fieldNameIndex(field2)
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outFields = vector.combineVectorFields(layer, layer2)
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writer = output.getVectorWriter(outFields, layer.wkbType(),
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layer.crs())
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# Cache attributes of Layer 2
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cache = {}
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features = vector.features(layer2)
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total = 100.0 / len(features)
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for current, feat in enumerate(features):
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attrs = feat.attributes()
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joinValue2 = unicode(attrs[joinField2Index])
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if joinValue2 not in cache:
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cache[joinValue2] = attrs
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progress.setPercentage(int(current * total))
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# Create output vector layer with additional attribute
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outFeat = QgsFeature()
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, feat in enumerate(features):
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outFeat.setGeometry(feat.geometry())
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attrs = feat.attributes()
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joinValue1 = unicode(attrs[joinField1Index])
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attrs.extend(cache.get(joinValue1, []))
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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del writer
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