| Compare transformed XText models - orderings [message #1065507] |
Wed, 26 June 2013 08:31  |
 Alex G
Messages: 96
Registered: January 2012 |
Member |
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Hi!
I have an XText DSL with 2 models A and B, which are "equivalent" in the sense, that the objects specified in both models are the same but just in another order, e.g.
model A as textual representation:
Node n
Node m
Edge n -> m
model B as textual representation:
Edge n -> m
Node m
Node n
In both models the Nodes specify name attributes and Edge references to the Node objects. The Nodes are specified in a NodeList and the Edges are specified in an EdgeList.
I want to unit test both models on equivalence, thus parse them with XText and compare both created Resources with EMFCompare 2.
I read that orderings could be checked with either setting the "ordered" attribute in the meta-model to false or neglecting the MOVE DifferenceKind or creating another DiffEngine with a FeatureFilter
http://wiki.eclipse.org/EMF_Compare/Developer_Guide#Changing_the_FeatureFilter
(which somehow did not detect the orderings and still created Differences with MOVE DifferenceKind).
However, I could filter with MOVE DifferenceKind.
Now my problem are the references in "Edge n -> m":
In model A the "n" references to the FIRST node (in XMI: ref="//@nodesList.0) while in model B "n" references to the SECOND node (ref="//@nodeList.1).
In EMFCompare these difference are checked by CHANGE DifferenceKind as well as ADD and DELETE! Now I do not want to completely neglect references, I just want to check, if the references go to the equivalent object, which was moved!
Do you have any ideas, how I can achieve this?
Best regards,
Alex.
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| Re: Compare transformed XText models - orderings [message #1066343 is a reply to message #1065507] |
Tue, 02 July 2013 08:55  |
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Alex,
The ordering on containment references is treated differently from the rest, mainly because of those "//@ref.0" URIs : they need to be detected to ensure a proper merge (since the URIs must change).
In your use case, if I understand correctly, there should be only one difference detected, a MOVE for either m or n corresponding to the reordering. I do not understand what your other differences are. What are the CHANGE, ADD and DELETE you see?
Laurent Goubet
Obeo
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