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HowTo use meta model class as type or parameter [message #1717516]

Mon, 14 December 2015 09:09

Eclipse User

Hello,

I'm working on a transformation rule from my own Ecore meta model to the
UML Ecore model. I'm quite new to ATL and want to know, how I can use a
meta model class in a rule, e.g. to set it as a type for a property or
call a ecore method which expects it as parameter.

In particular, I want to create a property with the specific type UML!Element.
Therefore, I use something like
type <- UML!Element
but this is not correct.

In another case, I want to create a UML Extension using the Ecore
Operation Stereotype.createExtension(metaclass: UML!Class, isrequired,
Boolean).
How do I get the type of UML!Class?

Thank you in advance,
Joachim

[Updated on: Mon, 14 December 2015 09:14] by Moderator

Re: HowTo use meta model class as type or parameter [message #1717523 is a reply to message #1717516]

Mon, 14 December 2015 09:56

Eclipse User

You should add the UML metamodel as input of your transformation in order to be able to reference it.

 in UML : ECORE

Then you should be able to do :

type <- ECORE!Class.allInstances()->one(e | e.name = 'Element')

[Updated on: Mon, 14 December 2015 09:57] by Moderator

Re: HowTo use meta model class as type or parameter [message #1717530 is a reply to message #1717523]

Mon, 14 December 2015 10:24

Eclipse User

Thank you for your quick answer.
I'm not sure, if I understand it right. I should add the metamodel
during the preperation of the VM (I use emftvm)? Then in my module, I
also add the UML as input model and name it ECORE, right? Then, your
code example should work?
Is it mandatory to name it ECORE?

Re: HowTo use meta model class as type or parameter [message #1717543 is a reply to message #1717530]

Mon, 14 December 2015 11:11

Eclipse User

UML is a metamodel but it also is a model conforming to the ECORE metamodel (which is also a meta-meta-model).
Here you just need to load UML as a model so that you can reference it.
You need to specify its metamodel which is ECORE but you can name is as you like.

Re: HowTo use meta model class as type or parameter [message #1717553 is a reply to message #1717543]

Mon, 14 December 2015 11:41

Eclipse User

Is it correct to load the UML metamodel as Ecore model? Or do I have to
load it as UML model? If so, where do I get the UML metamodel? If I look
into an existing UML model (.uml) using the UML model editor, I see,
that the meta model is referenced by
pathmap://UML_METAMODELS/UML.metamodel.uml
But this URI cannot be used to load the model with the emftvm.

I tried the UML Ecore MetaModel as input model and the following code:
umlProperty: UML!Property (
type <- ECORE!EClass.allInstancesFrom('UMLMetaModel')
-> select(e | e.name = 'Element').first()
)
but I get a ClassCastException: org.eclipse.emf.ecore.impl.EClassImpl
cannot be cast to org.eclipse.uml2.uml.Type

Re: HowTo use meta model class as type or parameter [message #1726270 is a reply to message #1717553]

Thu, 10 March 2016 15:54

Eclipse User

You need to load the UML metamodel expressed in the Ecore language, registered under the URI "http://www.eclipse.org/uml2/5.0.0/UML"

Re: HowTo use meta model class as type or parameter [message #1726271 is a reply to message #1726270]

Thu, 10 March 2016 15:58

Eclipse User

Wait, I didn't read the second half of your post: your transformation is expecting a UML Type. In that case the metamodel in your launch config should be the Ecore UML metamodel as I posted previously, and the model should be the UML metamodel expressed in UML itself.

P.S. if it this point you still don't get it to work, you had better attach an example zipped eclipse project to demonstrate what it is you want.

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