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133 lines
5.4 KiB
Python
133 lines
5.4 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 (QgsCoordinateReferenceSystem,
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QgsWkbTypes,
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QgsFeature,
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QgsFeatureSink,
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QgsFields,
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QgsProcessingParameterField,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputNumber,
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QgsProcessingOutputString,
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QgsProcessingParameterFileDestination,
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QgsProcessingOutputHtml)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class UniqueValues(QgisAlgorithm):
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INPUT = 'INPUT'
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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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OUTPUT_HTML_FILE = 'OUTPUT_HTML_FILE'
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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 analysis')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD_NAME,
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self.tr('Target field'),
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parentLayerParameterName=self.INPUT, type=QgsProcessingParameterField.Any))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Unique values'), optional=True, defaultValue=''))
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self.addParameter(QgsProcessingParameterFileDestination(self.OUTPUT_HTML_FILE, self.tr('HTML report'), self.tr('HTML files (*.html)'), None, True))
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self.addOutput(QgsProcessingOutputHtml(self.OUTPUT_HTML_FILE, self.tr('HTML report')))
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self.addOutput(QgsProcessingOutputNumber(self.TOTAL_VALUES, self.tr('Total unique values')))
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self.addOutput(QgsProcessingOutputString(self.UNIQUE_VALUES, self.tr('Unique values')))
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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 processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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field_name = self.parameterAsString(parameters, self.FIELD_NAME, context)
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values = source.uniqueValues(source.fields().lookupField(field_name))
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fields = QgsFields()
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field = source.fields()[source.fields().lookupField(field_name)]
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field.setName('VALUES')
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fields.append(field)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.NoGeometry, QgsCoordinateReferenceSystem())
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results = {}
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if sink:
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for value in values:
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if feedback.isCanceled():
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break
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f = QgsFeature()
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f.setAttributes([value])
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sink.addFeature(f, QgsFeatureSink.FastInsert)
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results[self.OUTPUT] = dest_id
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output_file = self.parameterAsFileOutput(parameters, self.OUTPUT_HTML_FILE, context)
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if output_file:
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self.createHTML(output_file, values)
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results[self.OUTPUT_HTML_FILE] = output_file
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results[self.TOTAL_VALUES] = len(values)
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results[self.UNIQUE_VALUES] = ';'.join([str(v) for v in
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values])
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return results
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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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