Eclipse Community Forums: M2T (model-to-text transformation) » [Xpand] Error when invoking a definition from Java with polymorphism

Home » Modeling » M2T (model-to-text transformation) » [Xpand] Error when invoking a definition from Java with polymorphism

[Xpand] Error when invoking a definition from Java with polymorphism [message #559942]

Mon, 20 September 2010 09:45

Eclipse User

Hey,

I have the following scenario: I work with 4 different versions of a meta model (MM1.ecore, MM2.ecore, MM3.ecore, MM4.ecore) and 1 general version (GMM.ecore) which should cover the common types of the 4 versions. All metamodels are defined in different files and MM1 to MM4 have references to GMM. (I didn't develop them so I am not able to change them)

GMM has types from which the other meta models inherit. So I have type A1, A2, A3 and A4 in MM1 ... MM4 which are all subtypes of type A specified in GMM. This is done via the ESuper Types property of the EClasses.

For each meta model I also have the corresponding Java classes in jar librarys (mm1.jar, mm2.jar, mm3.jar, mm4.jar, gmm.jar), so I am able to handle all these classes / types in my Java code.

Now I want to create a definition in an Xpand template for type A and invoke it in Java with e.g. type/class A1:

Xpand: file "gen.xpt"

«DEFINE main FOR A»
«ENDDEFINE»

Java:

private void generate(A1 a1)
{
  EmfMetaModel MM1 = new EmfMetaModel();
  EmfMetaModel GMM = new EmfMetaModel();
  MM1.setMetaModelFile("src/MM1.ecore");
  GMM.setMetaModelFile("src/GMM.ecore");
  this.context.registerMetaModel(MM1);
  this.context.registerMetaModel(GMM);

  XpandFacade facade = XpandFacade.create(this.context);
  facade.evaluate("src::gen::main", a1);
}

This invokation leads to the error message: "No Definition 'main for A1' could be found!" Internal error : element was null

If I add the following text into the Xpand template, it works:

«DEFINE main FOR A1»
«ENDDEFINE»

Is there anything wrong in my code or does Xpand not support this specific scenario?

I am really despaired Sad

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #559959 is a reply to message #559942]

Mon, 20 September 2010 10:36

Eclipse User

hi,

i cannot reproduce this with a simple sample. your sample is missing imports - maybe this is the problem

~Christian

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #560037 is a reply to message #559942]

Mon, 20 September 2010 17:14

Eclipse User

Unfortuneately the imports are not the problem Sad

I got the same error message Sad

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #560038 is a reply to message #560037]

Mon, 20 September 2010 17:16

Eclipse User

Hi,

another thing you can try is to register the metamodels via package name and not via ecore file.

~Christian

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #560039 is a reply to message #559942]

Mon, 20 September 2010 17:18

Eclipse User

You mean in the Java code?

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #560040 is a reply to message #560039]

Mon, 20 September 2010 17:21

Eclipse User

Yes:

EmfMetaModel MM1 = new EmfMetaModel();
MM1.setMetaModelPackage(ChildPackage.class.getName());
EmfMetaModel MM2 = new EmfMetaModel();
MM2.setMetaModelPackage(ParentPackage.class.getName());

~Christian

Re: [Xpand] Error when invoking a definition from Java with polymorphism [message #630542 is a reply to message #559942]

Sun, 03 October 2010 20:21

Eclipse User

I now found out that for all types in the general metamodel the properties "abstract" and "interface" are set to true in the ecore file.

I also tried out Xtend in this scenario and I also get an error there:

Couldn't resolve type for 'A'. Did you forget to configure the corresponding metamodel?

Could that be the problem? Are Xpand/Xtend not able to handle interfaces as types?

Previous Topic:	Misaligned feature name problems after upgrading to SR1
Next Topic:	[Acceleo] How to access list element?

Goto Forum:

-=] Back to Top [=-

Current Time: Fri Jul 04 21:17:22 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter