Speed optimisation for security

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3710 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -140,7 +140,13 @@ class ERP5TypeInformation( FactoryTypeInformation, RoleProviderBase ):
         """
         ob = FactoryTypeInformation.constructInstance(self, container, id, *args, **kw)
 
-        # Try to find the local role init script
+        # Only try to find the local role init script
+        # if some roles are defined
+        # This is an optimisation to prevent defining local roles on subobjects
+        # which acquire their security definition from their parent
+        # The downside of this optimisation is that it is not possible to 
+        # set a local role definition if the local role list is empty
+        if len(self._roles):
           init_role_script = getattr(ob, ERP5TYPE_ROLE_INIT_SCRIPT, None)
           if init_role_script is not None:
             # Retrieve applicable roles