refactor Text to float alg

alexbruy · alexbruy · commit 5306cd856695 · 2014-10-03T11:40:50.000+03:00
diff --git a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
@@ -75,6 +75,7 @@
 
 from mmqgisx.DeleteColumn import DeleteColumn
 from mmqgisx.DeleteDuplicateGeometries import DeleteDuplicateGeometries
+from mmqgisx.TextToFloat import TextToFloat
 
 from ConcaveHull import ConcaveHull
 from Polygonize import Polygonize
@@ -140,6 +141,7 @@ def __init__(self):
                         SpatialJoin(),
                         # ------ mmqgisx ------
                         DeleteColumn(), DeleteDuplicateGeometries(),
+                        TextToFloat(),
                         #mmqgisx_delete_duplicate_geometries_algorithm(),
                         #mmqgisx_geometry_convert_algorithm(),
                         #mmqgisx_grid_algorithm(),
diff --git a/python/plugins/processing/algs/qgis/mmqgisx/TextToFloat.py b/python/plugins/processing/algs/qgis/mmqgisx/TextToFloat.py
@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    DeleteColumn.py
+    ---------------------
+    Date                 : May 2010
+    Copyright            : (C) 2010 by Michael Minn
+    Email                : pyqgis at michaelminn 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__ = 'Michael Minn'
+__date__ = 'May 2010'
+__copyright__ = '(C) 2010, Michael Minn'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+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 OutputVector
+from processing.tools import dataobjects, vector
+
+
+class TextToFloat(GeoAlgorithm):
+    INPUT = 'INPUT'
+    FIELD = 'FIELD'
+    OUTPUT = 'OUTPUT'
+
+    def defineCharacteristics(self):
+        self.name = 'Text to float'
+        self.group = 'Vector table tools'
+
+        self.addParameter(ParameterVector(
+            self.INPUT, 'Input Layer', [ParameterVector.VECTOR_TYPE_ANY]))
+        self.addParameter(ParameterTableField(
+            self.FIELD, 'Text attribute to convert to float', self.INPUT,
+            ParameterTableField.DATA_TYPE_STRING))
+        self.addOutput(OutputVector(self.OUTPUT, 'Output'))
+
+    def processAlgorithm(self, progress):
+        layer = dataobjects.getObjectFromUri(
+                self.getParameterValue(self.INPUT))
+        fieldName = self.getParameterValue(self.FIELD)
+        idx = layer.fieldNameIndex(fieldName)
+
+        fields = layer.pendingFields()
+        fields[idx] = QgsField(fieldName, QVariant.Double, '', 24, 15)
+
+        writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
+            layer.wkbType(), layer.crs())
+
+        features = vector.features(layer)
+
+        count = len(features)
+        total = 100.0 / float(count)
+        for count, f in enumerate(features):
+            value = f[idx]
+            try:
+                if '%' in value:
+                    f[idx] = float(value.replace('%', '')) / 100.0
+                else:
+                    f[idx] = float(value)
+            except:
+                f[idx] = None
+
+            writer.addFeature(f)
+            progress.setPercentage(int(count * total))
+
+        del writer
