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References to other models [message #744099]

Fri, 21 October 2011 19:31

Eclipse User

Hello!

My name is José Miguel, and I would like to send a question to the forum. First to all, thanks you for your help.

I have two metamodels, one of they is a "normal metamodel" and in the other, some Eclases have EReferences to Eclass defined in the first metamodel.

* Metamodel 1 => normal
* Metamodel 2 => with Ereferences to Eclases in Metamodel 1

I'm trying do a test for to instance each metamodel and obtain two model, one for each metamodel, using EOL. In my test, I instance metamodel 1 obviously without problem, but when I try instance this Ereferences, I obtain the follow message:

Called feature source on undefined object (..../prueba.eol@67:13)

The question is: Is possible do it using Epsilon?. What is the way of do it?

Thanks you very much for you help!

Best regards.
José Miguel

Re: References to other models [message #748255 is a reply to message #744099]

Mon, 24 October 2011 11:36

Eclipse User

Dear José Miguel,

Welcome to the forums, and thank-you for your interest in Epsilon.

It is possible to navigate (and even change the values of) cross-model references with any of the Epsilon languages. I've put together an example Eclipse project that demonstrates this. Please import the attached ZIP file as a project into your Eclipse workspace, and then see the README for further instructions.

Hope this helps,
Louis.

Attachment: CrossModelReference.zip
(Size: 3.99KB, Downloaded 250 times)

Re: References to other models [message #748556 is a reply to message #748255]

Mon, 24 October 2011 15:05

Eclipse User

Hello Louis.

First to all, thanks you very much, your example has been very usefull for me.

I have checked my test again and I have compared it with your example, and I have found my mistake.

Only one note for futures people reading this thread. In your example, the file banks.ecore is not synchronized with banks.emf, because in your banks.emf don't exits the ref ref people.Person[*] customers; in the metaclass Bank. I have generate the emf from the ecore, and this is the results:

@namespace(uri="banks", prefix="banks")
package banks;

import "platform:/resource/CrossModelReference/metamodels/people.ecore";

class World {
  val Bank[*] banks;
}

class Bank {
  attr String[1] name;
  ref people.Person[*] customers;
}

Thanks you very much for your help and congratulations for Epsilon. It's really great.

José Miguel.

Re: References to other models [message #753298 is a reply to message #748556]

Wed, 26 October 2011 14:01

Eclipse User

Hi José Miguel,

I'm glad it helped, and thanks for the correction! (I think that I forgot the Emfatic syntax for a cross-model reference, specified it in the Ecore, and forgot to regenerate the Emfatic).

Thanks for feedback, and for using Epsilon!

Cheers,
Louis.

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