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JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143822]

Fri, 18 October 2013 08:53

Eclipse User

Hi,

I'm writing a JvmModelInferrer in which I create classes with methods with bodies.

In these body, I would like to declare variables of a given type, so I do something like that:

body = [
  aType.newTypeRef().serializeSafely(it)
  append(" varName = methodCall();")
]

newTypeRef comes from JvmTypesBuilder and serializeSafely comes from ErrorSafeExtensions.

The problem is that because this JvmTypeReference does not have any eContainer, when serialize (from TypeReferenceSerializer) is called by ErrorSafeExtensions with context set to the JvmTypeReference's eContainer which is null, I get a NPE...

Question:
1) is that the correct way of serializing a JvmTypeReference?
2) is there a better way to generate the body of the method? For example by building an XEpression instead of doing it by hand? How to build such an XEpression?

Thank you Smile

Victor

[Updated on: Fri, 18 October 2013 08:53] by Moderator

Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143873 is a reply to message #1143822]

Fri, 18 October 2013 09:30

Eclipse User

Hi where does a type come from and what type is it?
And why don't you simply write the type down?

--
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Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143879 is a reply to message #1143822]

Fri, 18 October 2013 09:38

Eclipse User

BTW if atype is a jvmtype you can call

Append(atype)

--
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Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143911 is a reply to message #1143879]

Fri, 18 October 2013 10:06

Eclipse User

Hi,

This type reference has type arguments: it is a reference, not a type, that's why I want to use serialize.

The type itself is a class generated with JvmModelInferrer.

Let's say I did in the infer method:

anObjectOfMyModel.toClass(name) [
  typeParameters += ...
]

I thus got a JvmGenericType, and then, I want to have a reference to this type, but with specific arguments.

Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143922 is a reply to message #1143911]

Fri, 18 October 2013 10:12

Eclipse User

Sorry have no idea on that

--
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Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1143980 is a reply to message #1143922]

Fri, 18 October 2013 11:04

Eclipse User

maybe you can use one of org.eclipse.xtext.xbase.compiler.TypeReferenceSerializer.serialize(JvmTypeReference, EObject, IAppendable)
and put your model object as context.

~Christian

Re: JvmModelInferrer: Serializing a JvmTypeReference and Generating a method body [message #1144012 is a reply to message #1143980]

Fri, 18 October 2013 11:27

Eclipse User

Hi,

Thank you, that works perfectly yes :)

If anybody comes around and knows the answer to the second question, it would be nice.
That would be much more elegant I think, but I guess xtext is not ready for meta-programming (yet ;).

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