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Create relations between different model [message #1821993]

Tue, 25 February 2020 04:43

Eclipse User

Hi!

Is there a way to create references between two different models? If so, what is the proper way to do so?

Here is the case I am trying to implement: I have an existing model called ModelX1 of type ModelX. It can, for example, hold various entities (ModelX1.components). I want to create a different model - ModelY1 (of type ModelY) - which has an element componentToBeAnalyzed that references ModelX1 and/or ModelX1.components.

I want to be able to do this by creating a new metamodel for ModelY class, which shows ModelY that is composed of ModelY.componentToBeAnalyzed (another class). ModelY.component has a reference to the external ModelX class or to the specific ModelX.components class. The reference is obviously one-directional, as I do not change anything in the ModelX metamodel.

Is this possible?

Thanks,
Avi

Re: Create relations between different model [message #1822131 is a reply to message #1821993]

Thu, 27 February 2020 11:48

Eclipse User

Hello

Your question is not related to Sirius but to to EMF.
Nevertheless, yes, it is possible to define a metamodel that has dependencies on another meta model, that is class1 in mettamodel1 may refer (inheritance for example) to a class2 in metamodel 2.
In your Ecore Model Editor, right click and select "Load resource" to load metamodel2 and then to be able to select class2.

Regards
Laurent

Re: Create relations between different model [message #1822211 is a reply to message #1822131]

Sun, 01 March 2020 03:54

Eclipse User

Thank you Laurent.

There's something I still don't get. I added the resource but I cannot add the external classes to my ecore class diagram.

I was only able to add such classes once I add the ecore model via Project Dependencies. However, "Add model" to Project Dependencies only allows adding resources from Files System or Workspace (like in this image: https://www.eclipse.org/ecoretools/doc/pasted-images/02b4636be8ad44ff5e8f0f699eea4e80.png).

What am I doing wrong?

Re: Create relations between different model [message #1822212 is a reply to message #1822211]

Sun, 01 March 2020 05:01

Eclipse User

Hi

You do not add external classes to an Ecore Model. After Load Resource, you may reference those classes as supertypes, or reference types. IIRC in an Ecore Diagram you may add a link to an external class.

Regards

Ed Willink

Re: Create relations between different model [message #1822213 is a reply to message #1822212]

Sun, 01 March 2020 07:09

Eclipse User

Thanks Ed.

I understand that you are not supposed to add external classes to an ECORE model. Actually, what I meant was to add a reference to an external class, and not the actual external class.

You can add external class to an ECORE diagram (so that it can be referenced by new classes in another model), but only if it was added using "Add model" as I mentioned earlier (at least that's how it worked for me).
I am trying to find a more general way to do it (for example, connect with installed pakcages without having their ecore definition).

Re: Create relations between different model [message #1822215 is a reply to message #1822213]

Sun, 01 March 2020 09:03

Eclipse User

Hi

I suggest that you experiment with the Sample Ecore Model Editor that is very tried and trusted and there are many answers on the EMF newsgroup.

Once you understand what happens behind the scenes you can see whether your actions with the Ecore Diagram Editor behave consistently and if not raise a Bugzilla.

Regards

Ed Willink

Re: Create relations between different model [message #1822286 is a reply to message #1822215]

Tue, 03 March 2020 03:55

Eclipse User

Thank you Ed.

If you were referring to this tutorial: https://eclipsesource.com/blogs/tutorials/emf-tutorial/
then, I am already familiar with it. If not, I will appreciate a link.

Thanks,
Avi

[Updated on: Tue, 03 March 2020 03:58] by Moderator

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