mirror of
https://github.com/qgis/QGIS.git
synced 2025-11-04 00:04:25 -05:00
109 lines
4.4 KiB
Python
109 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
JoinAttributes.py
|
|
---------------------
|
|
Date : August 2012
|
|
Copyright : (C) 2012 by Victor Olaya
|
|
Email : volayaf at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Victor Olaya'
|
|
__date__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.core import QgsFeature
|
|
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterTable
|
|
from processing.core.parameters import ParameterTableField
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class JoinAttributes(GeoAlgorithm):
|
|
|
|
OUTPUT_LAYER = 'OUTPUT_LAYER'
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
INPUT_LAYER_2 = 'INPUT_LAYER_2'
|
|
TABLE_FIELD = 'TABLE_FIELD'
|
|
TABLE_FIELD_2 = 'TABLE_FIELD_2'
|
|
|
|
def defineCharacteristics(self):
|
|
self.name, self.i18n_name = self.trAlgorithm('Join attributes table')
|
|
self.group, self.i18n_group = self.trAlgorithm('Vector general tools')
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER,
|
|
self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY], False))
|
|
self.addParameter(ParameterTable(self.INPUT_LAYER_2,
|
|
self.tr('Input layer 2'), False))
|
|
self.addParameter(ParameterTableField(self.TABLE_FIELD,
|
|
self.tr('Table field'), self.INPUT_LAYER))
|
|
self.addParameter(ParameterTableField(self.TABLE_FIELD_2,
|
|
self.tr('Table field 2'), self.INPUT_LAYER_2))
|
|
self.addOutput(OutputVector(self.OUTPUT_LAYER,
|
|
self.tr('Joined layer')))
|
|
|
|
def processAlgorithm(self, progress):
|
|
input = self.getParameterValue(self.INPUT_LAYER)
|
|
input2 = self.getParameterValue(self.INPUT_LAYER_2)
|
|
output = self.getOutputFromName(self.OUTPUT_LAYER)
|
|
field = self.getParameterValue(self.TABLE_FIELD)
|
|
field2 = self.getParameterValue(self.TABLE_FIELD_2)
|
|
|
|
# Layer 1
|
|
layer = dataobjects.getObjectFromUri(input)
|
|
provider = layer.dataProvider()
|
|
joinField1Index = layer.fieldNameIndex(field)
|
|
|
|
# Layer 2
|
|
layer2 = dataobjects.getObjectFromUri(input2)
|
|
|
|
joinField2Index = layer2.fieldNameIndex(field2)
|
|
|
|
# Output
|
|
outFields = vector.combineVectorFields(layer, layer2)
|
|
|
|
writer = output.getVectorWriter(outFields, provider.geometryType(),
|
|
layer.crs())
|
|
|
|
inFeat = QgsFeature()
|
|
inFeat2 = QgsFeature()
|
|
outFeat = QgsFeature()
|
|
|
|
# Cache attributes of Layer 2
|
|
cache = {}
|
|
features2 = vector.features(layer2)
|
|
for inFeat2 in features2:
|
|
attrs2 = inFeat2.attributes()
|
|
joinValue2 = unicode(attrs2[joinField2Index])
|
|
# Put the attributes into the dict if the join key is not contained in the keys of the dict.
|
|
# Note: This behavior is same as previous behavior of this function,
|
|
# but different from the attribute cache function of QGIS core.
|
|
if joinValue2 not in cache:
|
|
cache[joinValue2] = attrs2
|
|
|
|
# Create output vector layer with additional attribute
|
|
features = vector.features(layer)
|
|
for inFeat in features:
|
|
outFeat.setGeometry(inFeat.geometry())
|
|
attrs = inFeat.attributes()
|
|
joinValue1 = unicode(attrs[joinField1Index])
|
|
attrs.extend(cache.get(joinValue1, []))
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
del writer
|