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[ATL] Target model should have a reference to the source model [message #658654]

Wed, 09 March 2011 06:55

Eclipse User

Hi,

I have a simple question regarding ATL transformations. My purpose is to transform a source model into a target model where the elements in the target model should have a refernce to the corresponding element in the source model.

For this purpose I wrote the following ATL rule:

rule model {
	from 
		i : SOURCE!ClassA
	to
		o : TARGET!ClassB(
			name <-  i.name,
                        sourceRef <- i
		)

If I execute the transformation I get a ClassCastException with the message the ClassBImpl can not be cast to ClassB.

How I have to change the part of the transformation rule about sourceRef?

Re: [ATL] Target model should have a reference to the source model [message #658664 is a reply to message #658654]

Wed, 09 March 2011 07:35

Eclipse User

Hi,
In your code there you are assigning an instance of A to a property on B. I assume you want to assign the type A to the property on B? i.oclType() will assign type A to the property on B.

If you do want to assign an instance to the property on B then you will to set it to an appropriate type.

Regards,
Ronan

Re: [ATL] Target model should have a reference to the source model [message #658667 is a reply to message #658664]

Wed, 09 March 2011 07:49

Eclipse User

Hi,

Thank you for your answer.
I don't want to assign the type of A to B. In the metamodel sourceRef is a non-containment eReference to A. Hence, the newly created element of B should reference the input element of A by assigning:

B.sourceRef = A

Hope, this helps to answer my question.

Thanks

Re: [ATL] Target model should have a reference to the source model [message #658677 is a reply to message #658654]

Wed, 09 March 2011 08:09

Eclipse User

ATL has a resolve mechanism that links each input element to the first output element.
So when you have the binding sourceRef <- i, in the end, "i" will be replaced by o.

You could maybe try the refining mode.
You'll then have :

rule model {
	from 
		i : SOURCE!ClassA
	to
		k : SOURCE!ClassA(),
		o : TARGET!ClassB(
			name <-  i.name,
                        sourceRef <- k
		)

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