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"""
***************************************************************************
BasicStatisticsStrings.py
---------------------
Date : September 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__ = 'September 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import codecs
from PyQt4.QtCore import *
from qgis.core import *
from processing.core.GeoAlgorithm import GeoAlgorithm
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.tools import dataobjects, vector
class BasicStatisticsStrings(GeoAlgorithm):
INPUT_LAYER = 'INPUT_LAYER'
FIELD_NAME = 'FIELD_NAME'
OUTPUT_HTML_FILE = 'OUTPUT_HTML_FILE'
MIN_LEN = 'MIN_LEN'
MAX_LEN = 'MAX_LEN'
MEAN_LEN = 'MEAN_LEN'
COUNT = 'COUNT'
EMPTY = 'EMPTY'
FILLED = 'FILLED'
UNIQUE = 'UNIQUE'
def defineCharacteristics(self):
self.name = 'Basic statistics for text fields'
self.group = 'Vector table tools'
self.addParameter(ParameterVector(self.INPUT_LAYER,
'Input vector layer',
ParameterVector.VECTOR_TYPE_ANY, False))
self.addParameter(ParameterTableField(self.FIELD_NAME,
'Field to calculate statistics on',
self.INPUT_LAYER,
ParameterTableField.DATA_TYPE_STRING))
self.addOutput(OutputHTML(self.OUTPUT_HTML_FILE,
'Statistics for text field'))
self.addOutput(OutputNumber(self.MIN_LEN, 'Minimum length'))
self.addOutput(OutputNumber(self.MAX_LEN, 'Maximum length'))
self.addOutput(OutputNumber(self.MEAN_LEN, 'Mean length'))
self.addOutput(OutputNumber(self.COUNT, 'Count'))
self.addOutput(OutputNumber(self.EMPTY, 'Number of empty values'))
self.addOutput(OutputNumber(self.FILLED, 'Number of non-empty values'))
self.addOutput(OutputNumber(self.UNIQUE, 'Number of unique values'))
def processAlgorithm(self, progress):
layer = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT_LAYER))
fieldName = self.getParameterValue(self.FIELD_NAME)
outputFile = self.getOutputValue(self.OUTPUT_HTML_FILE)
index = layer.fieldNameIndex(fieldName)
sumValue = 0
minValue = 0
maxValue = 0
meanValue = 0
countEmpty = 0
countFilled = 0
isFirst = True
values = []
features = vector.features(layer)
count = len(features)
total = 100.0 / float(count)
current = 0
for ft in features:
length = float(len(ft.attributes()[index]))
if isFirst:
minValue = length
maxValue = length
isFirst = False
else:
if length < minValue:
minValue = length
if length > maxValue:
maxValue = length
if length != 0.00:
countFilled += 1
else:
countEmpty += 1
values.append(length)
sumValue += length
current += 1
progress.setPercentage(int(current * total))
n = float(len(values))
if n > 0:
meanValue = sumValue / n
uniqueValues = vector.getUniqueValuesCount(layer, index)
data = []
data.append('Minimum length: ' + unicode(minValue))
data.append('Maximum length: ' + unicode(maxValue))
data.append('Mean length: ' + unicode(meanValue))
data.append('Filled: ' + unicode(countFilled))
data.append('Empty: ' + unicode(countEmpty))
data.append('Count: ' + unicode(count))
data.append('Unique: ' + unicode(uniqueValues))
self.createHTML(outputFile, data)
self.setOutputValue(self.MIN_LEN, minValue)
self.setOutputValue(self.MAX_LEN, maxValue)
self.setOutputValue(self.MEAN_LEN, meanValue)
self.setOutputValue(self.FILLED, countFilled)
self.setOutputValue(self.EMPTY, countEmpty)
self.setOutputValue(self.COUNT, count)
self.setOutputValue(self.UNIQUE, uniqueValues)
def createHTML(self, outputFile, algData):
f = codecs.open(outputFile, 'w', encoding='utf-8')
f.write('<html><head>')
f.write('<meta http-equiv="Content-Type" content="text/html; \
charset=utf-8" /></head><body>')
for s in algData:
f.write('<p>' + str(s) + '</p>')
f.write('</body></html>')
f.close()
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