# -*- coding: utf-8 -*-
"""
***************************************************************************
UniqueValues.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. *
* *
***************************************************************************
"""
from builtins import str
__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__ = '$Format:%H$'
import os
import codecs
from qgis.PyQt.QtGui import QIcon
from qgis.core import QgsProcessingUtils, QgsFeatureSink
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.outputs import OutputHTML
from processing.core.outputs import OutputNumber
from processing.core.outputs import OutputString
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class UniqueValues(QgisAlgorithm):
INPUT_LAYER = 'INPUT_LAYER'
FIELD_NAME = 'FIELD_NAME'
TOTAL_VALUES = 'TOTAL_VALUES'
UNIQUE_VALUES = 'UNIQUE_VALUES'
OUTPUT = 'OUTPUT'
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'unique.png'))
def group(self):
return self.tr('Vector table tools')
def __init__(self):
super().__init__()
self.addParameter(ParameterVector(self.INPUT_LAYER,
self.tr('Input layer')))
self.addParameter(ParameterTableField(self.FIELD_NAME,
self.tr('Target field'),
self.INPUT_LAYER, ParameterTableField.DATA_TYPE_ANY))
self.addOutput(OutputHTML(self.OUTPUT, self.tr('Unique values')))
self.addOutput(OutputNumber(self.TOTAL_VALUES, self.tr('Total unique values')))
self.addOutput(OutputString(self.UNIQUE_VALUES, self.tr('Unique values')))
def name(self):
return 'listuniquevalues'
def displayName(self):
return self.tr('List unique values')
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
fieldName = self.getParameterValue(self.FIELD_NAME)
outputFile = self.getOutputValue(self.OUTPUT)
values = QgsProcessingUtils.uniqueValues(layer, layer.fields().lookupField(fieldName), context)
self.createHTML(outputFile, values)
self.setOutputValue(self.TOTAL_VALUES, len(values))
self.setOutputValue(self.UNIQUE_VALUES, ';'.join([str(v) for v in
values]))
def createHTML(self, outputFile, algData):
with codecs.open(outputFile, 'w', encoding='utf-8') as f:
f.write('')
f.write('')
f.write(self.tr('Total unique values: ') + str(len(algData)) + '
')
f.write(self.tr('Unique values:
'))
f.write('')
for s in algData:
f.write('- ' + str(s) + '
')
f.write('
')