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[QVTO] Resolve on disjunctive mapping [message #854691]

Tue, 24 April 2012 06:50

Christopher Gerking

Messages: 115
Registered: April 2011

Senior Member

I am trying to apply the resolveIn operation to a mapping that uses the disjuncts keyword. The result is always null. When I apply the resolve directly to the mappings that the original one delegates to, everything works fine.

Is there a specific reason that the trace does not support disjunctive mappings?

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Re: [QVTO] Resolve on disjunctive mapping [message #855096 is a reply to message #854691]

Tue, 24 April 2012 14:14

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Pending a more informed reply...

I find the various resolve operators slightly hard to understand and the
interactions of disjuncts and inherits sometimes surprising. No doubt
many of the problems are due to my poor understanding, but I suspect
there are some areas where an imperfect QVTo implementation (or
specification) aggravates misunderstanding. The vagueness of the
specification may require you to do some empirical discovery to
determine which of the available constructs work reliably and in accord
with your evolved understanding.

HTH

Regards

Ed Willink

On 24/04/2012 07:50, Missing name Mising name wrote:
> I am trying to apply the resolveIn operation to a mapping that uses
> the disjuncts keyword. The result is always null. When I apply the
> resolve directly to the mappings that the original one delegates to,
> everything works fine.
>
> Is there a specific reason that the trace does not support disjunctive
> mappings?

Report message to a moderator

Re: [QVTO] Resolve on disjunctive mapping [message #857300 is a reply to message #855096]

Thu, 26 April 2012 12:36

Christopher Gerking

Messages: 115
Registered: April 2011

Senior Member

I see that the specification is not very precise. But in this case, i think it would not hurt to change the implementation towards support for resolving on disjunctive mappings, since currently the result is always null. I think no one actually relies on this null result for his existing transformations. In addition, it does not sound too hard to implement, since the information about mapped objects only has to be propagated such that it is available for the disjunctive mapping. Bugzilla?

[Updated on: Thu, 26 April 2012 12:39]

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Re: [QVTO] Resolve on disjunctive mapping [message #857312 is a reply to message #857300]

Thu, 26 April 2012 12:50

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

The Eclipse implementations endeavour to follow the specification, so if
you think the specification needs enhancement
http://www.omg.org/report_issue.htm is the appropriate channel.

Regards

Ed Willink

On 26/04/2012 13:36, Missing name Mising name wrote:
> I see that the specification is not very precise. But in this case, i
> think it would not hurt to change the implementation towards support
> for resolving on disjunctive mappings, since currently the result is
> always null. I think no one actually relies on this null result for
> his existing transformations. In addition, it does not sound too hard
> to implement, since the information about mapped objects only has to
> be propagated such that it is available for the disjunctive mapping.
> Bugzilla?

Report message to a moderator

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