getAggregatedAmountList: iterate and filter instead of expand and filter

It is not necessary to build the entire list of transformation lines,
we can just examine and filter each line, as they are yielded


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31477 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Transformation.py

@@ -245,19 +245,6 @@ class Transformation(XMLObject, Predicate, Variated):
                            with the quantity of the context
       """
       context = self.asContext(context=context, REQUEST=REQUEST, **kw)
-      # First we need to get the list of transformations which this 
-      # transformation depends on
-      # At this moment, we only consider 1 dependency
-      template_transformation_list = self.getSpecialiseValueList()
-      result = AggregatedAmountList()
-
-      # Browse all involved transformations and create one line per 
-      # line of transformation
-      # Currently, we do not consider abstractions, we just add 
-      # whatever we find in all transformations
-      transformation_line_list = []
-      for transformation in ([self]+template_transformation_list):
-        transformation_line_list.extend(transformation.objectValues())
 
       # A list of functions taking a transformation_line as sole argument
       # and returning True iif the line should be kept in the result
@@ -295,7 +282,18 @@ class Transformation(XMLObject, Predicate, Variated):
             return False
         return True
 
-      for transformation_line in transformation_line_list:
+      # First we need to get the list of transformations which this
+      # transformation depends on
+      # At this moment, we only consider 1 dependency
+      template_transformation_list = self.getSpecialiseValueList()
+
+      # Browse all involved transformations and create one line per
+      # line of transformation
+      # Currently, we do not consider abstractions, we just add
+      # whatever we find in all transformations
+      result = AggregatedAmountList()
+      for transformation in ([self] + template_transformation_list):
+        for transformation_line in transformation.objectValues():
           # Browse each transformed or assorted resource of the current
           # transformation
           if line_is_included(transformation_line):