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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
98 lines
3.9 KiB
Python
98 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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UniqueValues.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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import codecs
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import QgsProcessingUtils
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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 ParameterTableField
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from processing.core.outputs import OutputHTML
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from processing.core.outputs import OutputNumber
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from processing.core.outputs import OutputString
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class UniqueValues(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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FIELD_NAME = 'FIELD_NAME'
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TOTAL_VALUES = 'TOTAL_VALUES'
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UNIQUE_VALUES = 'UNIQUE_VALUES'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'unique.png'))
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def group(self):
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return self.tr('Vector table tools')
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def name(self):
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return 'listuniquevalues'
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def displayName(self):
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return self.tr('List unique values')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.FIELD_NAME,
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self.tr('Target field'),
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self.INPUT_LAYER, ParameterTableField.DATA_TYPE_ANY))
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self.addOutput(OutputHTML(self.OUTPUT, self.tr('Unique values')))
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self.addOutput(OutputNumber(self.TOTAL_VALUES, self.tr('Total unique values')))
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self.addOutput(OutputString(self.UNIQUE_VALUES, self.tr('Unique values')))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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fieldName = self.getParameterValue(self.FIELD_NAME)
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outputFile = self.getOutputValue(self.OUTPUT)
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values = QgsProcessingUtils.uniqueValues(layer, layer.fields().lookupField(fieldName), context)
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self.createHTML(outputFile, values)
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self.setOutputValue(self.TOTAL_VALUES, len(values))
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self.setOutputValue(self.UNIQUE_VALUES, ';'.join([str(v) for v in
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values]))
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def createHTML(self, outputFile, algData):
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with codecs.open(outputFile, 'w', encoding='utf-8') as f:
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f.write('<html><head>')
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f.write('<meta http-equiv="Content-Type" content="text/html; \
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charset=utf-8" /></head><body>')
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f.write(self.tr('<p>Total unique values: ') + str(len(algData)) + '</p>')
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f.write(self.tr('<p>Unique values:</p>'))
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f.write('<ul>')
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for s in algData:
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f.write('<li>' + str(s) + '</li>')
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f.write('</ul></body></html>')
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