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109 lines
4.4 KiB
Python
109 lines
4.4 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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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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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 1
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layer = dataobjects.getObjectFromUri(input)
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provider = layer.dataProvider()
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joinField1Index = layer.fieldNameIndex(field)
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# Layer 2
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layer2 = dataobjects.getObjectFromUri(input2)
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joinField2Index = layer2.fieldNameIndex(field2)
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# Output
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outFields = vector.combineVectorFields(layer, layer2)
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writer = output.getVectorWriter(outFields, provider.geometryType(),
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layer.crs())
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inFeat = QgsFeature()
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inFeat2 = QgsFeature()
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outFeat = QgsFeature()
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# Cache attributes of Layer 2
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cache = {}
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features2 = vector.features(layer2)
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for inFeat2 in features2:
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attrs2 = inFeat2.attributes()
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joinValue2 = unicode(attrs2[joinField2Index])
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# Put the attributes into the dict if the join key is not contained in the keys of the dict.
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# Note: This behavior is same as previous behavior of this function,
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# but different from the attribute cache function of QGIS core.
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if joinValue2 not in cache:
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cache[joinValue2] = attrs2
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# Create output vector layer with additional attribute
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features = vector.features(layer)
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for inFeat in features:
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outFeat.setGeometry(inFeat.geometry())
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attrs = inFeat.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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del writer
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