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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.
116 lines
4.6 KiB
Python
116 lines
4.6 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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from builtins import str
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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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QgsFeatureSink,
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QgsApplication,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class JoinAttributes(QgisAlgorithm):
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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 group(self):
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return self.tr('Vector general tools')
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def __init__(self):
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super().__init__()
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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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 name(self):
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return 'joinattributestable'
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def displayName(self):
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return self.tr('Join attributes table')
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def processAlgorithm(self, parameters, context, feedback):
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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 = QgsProcessingUtils.mapLayerFromString(input, context)
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joinField1Index = layer.fields().lookupField(field)
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layer2 = QgsProcessingUtils.mapLayerFromString(input2, context)
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joinField2Index = layer2.fields().lookupField(field2)
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outFields = vector.combineVectorFields(layer, layer2)
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writer = output.getVectorWriter(outFields, layer.wkbType(), layer.crs(), context)
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# Cache attributes of Layer 2
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cache = {}
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features = QgsProcessingUtils.getFeatures(layer2, context)
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total = 100.0 / layer2.featureCount() if layer2.featureCount() else 0
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for current, feat in enumerate(features):
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attrs = feat.attributes()
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joinValue2 = str(attrs[joinField2Index])
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if joinValue2 not in cache:
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cache[joinValue2] = attrs
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feedback.setProgress(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 = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / layer.featureCount() if layer.featureCount() else 0
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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 = str(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, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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