# -*- 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. *
* *
***************************************************************************
"""
__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.path
import codecs
from PyQt4 import QtGui
from sextante.core.GeoAlgorithm import GeoAlgorithm
from sextante.core.QGisLayers import QGisLayers
from sextante.parameters.ParameterVector import ParameterVector
from sextante.parameters.ParameterTableField import ParameterTableField
from sextante.outputs.OutputHTML import OutputHTML
from sextante.outputs.OutputNumber import OutputNumber
class UniqueValues(GeoAlgorithm):
INPUT_LAYER = "INPUT_LAYER"
FIELD_NAME = "FIELD_NAME"
TOTAL_VALUES = "TOTAL_VALUES"
OUTPUT = "OUTPUT"
#===========================================================================
# def getIcon(self):
# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/unique.png")
#===========================================================================
def defineCharacteristics(self):
self.name = "List unique values"
self.group = "Vector table tools"
self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
self.addParameter(ParameterTableField(self.FIELD_NAME, "Targer field", self.INPUT_LAYER, ParameterTableField.DATA_TYPE_ANY))
self.addOutput(OutputHTML(self.OUTPUT, "Unique values"))
self.addOutput(OutputNumber(self.TOTAL_VALUES, "Total unique values"))
def processAlgorithm(self, progress):
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
fieldName = self.getParameterValue(self.FIELD_NAME)
outputFile = self.getOutputValue(self.OUTPUT)
values = layer.uniqueValues(layer.fieldNameIndex(fieldName))
self.createHTML(outputFile, values)
self.setOutputValue(self.TOTAL_VALUES, len(values))
def createHTML(self, outputFile, algData):
f = codecs.open(outputFile, "w", encoding="utf-8")
f.write('')
f.write('')
f.write("Total unique values: " + str(len(algData)) + "
")
f.write("Unique values:
")
f.write("")
for s in algData:
f.write("- " + unicode(s.toString()) + "
")
f.write("
")
f.close()