[sextante] added preprocessing of input params for saga algorithms

Author: volaya

python/plugins/sextante/algs/FieldsCalculator.py

@@ -47,13 +47,9 @@ class FieldsCalculator(GeoAlgorithm):
     FORMULA = "FORMULA"
     OUTPUT_LAYER = "OUTPUT_LAYER"
 
-    TYPE_NAMES = ["Integer", "Float", "String"]
-    TYPES = [QVariant.Int, QVariant.Double, QVariant.String]
+    TYPE_NAMES = ["Float", "Integer", "String", "Boolean"]
+    TYPES = [QVariant.Double, QVariant.Int, QVariant.String. QVariant.Bool]
 
-    #===========================================================================
-    # def getIcon(self):
-    #    return QtGui.QIcon(os.path.dirname(__file__) + "/../images/qgis.png")
-    #===========================================================================
 
     def defineCharacteristics(self):
         self.name = "Field calculator"
@@ -62,7 +58,7 @@ def defineCharacteristics(self):
         self.addParameter(ParameterString(self.FIELD_NAME, "Result field name"))
         self.addParameter(ParameterSelection(self.FIELD_TYPE, "Field type", self.TYPE_NAMES))
         self.addParameter(ParameterNumber(self.FIELD_LENGTH, "Field length", 1, 255, 10))
-        self.addParameter(ParameterNumber(self.FIELD_PRECISION, "Field precision", 0, 10, 0))
+        self.addParameter(ParameterNumber(self.FIELD_PRECISION, "Field precision", 0, 10, 5))
         self.addParameter(ParameterString(self.FORMULA, "Formula"))
         self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer"))
 
@@ -85,17 +81,20 @@ def processAlgorithm(self, progress):
         nFeat = provider.featureCount()
         nElement = 0
         features = QGisLayers.features(layer)
+        
+        fieldnames = [field.name() for field in provider.fields()]        
+        fieldnames.sort(key=len, reverse=False)
+        fieldidx = [fieldnames.index(field.name()) for field in provider.fields()]
+        print fieldidx
         for inFeat in features:
             progress.setPercentage(int((100 * nElement) / nFeat))
             attrs = inFeat.attributes()
-            expression = formula
-            k = 0
-            for attr in attrs:
-                expression = expression.replace(unicode(fields[k].name()), unicode(attr))
-                k += 1
-            try:
+            expression = formula            
+            for idx in fieldidx:            
+                expression = expression.replace(unicode(fields[idx].name()), unicode(attrs[idx]))                
+            try:                          
                 result = eval(expression)
-            except Exception:
+            except Exception:                                                
                 result = None
                 #raise GeoAlgorithmExecutionException("Problem evaluation formula: Wrong field values or formula")
             nElement += 1

python/plugins/sextante/saga/CMakeLists.txt

@@ -1,5 +1,7 @@
 FILE(GLOB PY_FILES *.py)
 FILE(GLOB DESCR_FILES description/*.txt)
 
+ADD_SUBDIRECTORY(ext)
+
 PLUGIN_INSTALL(sextante saga ${PY_FILES})
 PLUGIN_INSTALL(sextante saga/description ${DESCR_FILES})

python/plugins/sextante/saga/SagaAlgorithm.py

@@ -16,6 +16,7 @@
 *                                                                         *
 ***************************************************************************
 """
+import importlib
 
 __author__ = 'Victor Olaya'
 __date__ = 'August 2012'
@@ -180,6 +181,8 @@ def processAlgorithm(self, progress):
                 raise GeoAlgorithmExecutionException("SAGA folder is not configured.\nPlease configure it before running SAGA algorithms.")
         commands = list()
         self.exportedLayers = {}
+                
+        self.preProcessInputs()
 
         #1: Export rasters to sgrd and vectors to shp
         #   Tables must be in dbf format. We check that.
@@ -306,8 +309,9 @@ def processAlgorithm(self, progress):
                 else:
                     commands.append("libio_gdal 1 -GRIDS \"" + filename2 + "\" -FORMAT 1 -TYPE 0 -FILE \"" + filename + "\"");
 
-
+        
         #4 Run SAGA
+        commands = self.editCommands(commands)
         SagaUtils.createSagaBatchJobFileFromSagaCommands(commands)
         loglines = []
         loglines.append("SAGA execution commands")
@@ -319,6 +323,28 @@ def processAlgorithm(self, progress):
         SagaUtils.executeSaga(progress);
 
 
+    def preProcessInputs(self):
+        name = self.commandLineName().replace('.','_')[len('saga:'):]
+        try:
+            module = importlib.import_module('sextante.grass.ext.' + name)
+        except ImportError:
+            return
+        if hasattr(module, 'preProcessInputs'):
+            func = getattr(module,'preProcessInputs')
+            func(self)
+            
+    def editCommands(self, commands):
+        name = self.commandLineName()[len('saga:'):]
+        try:
+            module = importlib.import_module('sextante.grass.ext.' + name)
+        except ImportError:
+            return commands
+        if hasattr(module, 'editCommands'):
+            func = getattr(module,'editCommands')
+            return func(commands)
+        else:
+            return commands
+
     def getOutputCellsize(self):
         '''tries to guess the cellsize of the output, searching for a parameter with an appropriate name for it'''
         cellsize = 0;

python/plugins/sextante/saga/description/SupervisedClassification.txt

@@ -11,4 +11,4 @@ ParameterSelection|RELATIVE_PROB|Probability Reference|[0] absolute;[1] relative
 ParameterNumber|THRESHOLD_ANGLE|Spectral Angle Threshold (Degree)|None|None|0.0
 OutputTable|CLASS_INFO|Class Information
 OutputRaster|CLASSES|Classification
-OutputRaster|QUALITY|Quality
+OutputRaster|QUALITY|Quality

python/plugins/sextante/saga/ext/CMakeLists.txt

@@ -0,0 +1,3 @@
+FILE(GLOB PY_FILES *.py)
+
+PLUGIN_INSTALL(sextante saga/ext ${PY_FILES})

python/plugins/sextante/saga/ext/__init__.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    supervisedclassification.py
+    ---------------------
+    Date                 : July 2013
+    Copyright            : (C) 2013 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 sextante.tests.TestData import table
+__author__ = 'Victor Olaya'
+__date__ = 'July 2013'
+__copyright__ = '(C) 2013, Victor Olaya'
+# This will get replaced with a git SHA1 when you do a git archive
+__revision__ = '$Format:%H$'
+
+
+def editCommands(commands):    
+    commands[-1] = commands[-1] + " -STATS" + table()
+    return commands 
+    
+