[news.eclipse.modeling.m2m] Re: [ATL] Re: Does transformation rules orde

[Brahim Loukil <brahim-khalil.loukil@xxxxxxxxxxxxxx>]

Jorge Manrubia a écrit :
> Hi,
>
> Yes, that's exactly the case. We have a complex rule making use of 
> elements that should be created by more simple rules. Indeed they are 
> created, but are not linked with the elements created by the complex 
> rule. If we put the complex rule first, it seems that primitive 
> transformation target elements don't exist when it's executed, while 
> they are properly created later. If we put the complex rule the last 
> one, it works as expected.
>
> We are not using "resolveTemp()". I expect that normal ATL resolve 
> behaviour would resolve assigned elements (invoking the corresponding 
> SOURCE to TARGET rule first) when a SOURCE element is in the right part 
> of a binding.
>
> We are very new with this engine (althought we already love it) so our 
> assumptions might be totally wrong.
>
> Thank you very much for your help
>
> Rene Ladan wrote:
>
> > The order of the transformation rules should indeed be indifferent
> > Every functional transformation language (XSLT/ATL/...) works this way.
>
> > Could there some dependency between them (e.g. that the complex rule
> > references a resulting element from the simpler rules, either direct
> > or through thisModule.resolveTemp()) ?
>
> > Rene
Hi,
As Rene said, the order of rules should be indifferent.
However, in some cases and it doesn't depend on the complexity of the 
rule, you have to specify a logic order. Take a look at the example below:

rule EEnum2Enumeration extends EClassifier2Classifier {
	from
		ec	: Ecore!EEnum			
	to
		c	: UML!Enumeration (				
				ownedLiteral<- ec.eLiterals			
			)
}

rule EDataType2DataType extends EClassifier2Classifier {
	from
		ec	: Ecore!EDataType			
	to
		c	: UML!DataType (
		)
}

As you know EEnum is a subtype of EDataType in the Ecore metametamodel, 
so if you put the rule for EDataType first, you will get a strange behavior.
You need to put rules for subtypes first.

If you are not satisfy with this, you can open a bug via Eclipse Bugzilla.

Brahim.