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377b181c4e
Also - simplify and add tests - remove large memory leak (persistant store of all non-project layers) - remove broken support for direct loading postgres/virtual layers by string (Python version was very broken and would never match a postgres/virtual layer)
96 lines
3.8 KiB
Python
96 lines
3.8 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 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, vector
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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, feedback):
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layer = dataobjects.getLayerFromString(self.getParameterValue(self.INPUT_LAYER))
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fieldName = self.getParameterValue(self.FIELD_NAME)
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outputFile = self.getOutputValue(self.OUTPUT)
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values = vector.getUniqueValues(layer, layer.fields().lookupField(fieldName))
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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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