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[Xtend] Cannot create instance of abstract class [message #650514]

Tue, 25 January 2011 06:35

Eclipse User

I am trying to migrate my M2M xtend project, but i am stuck at the point when i get this error:

xtend file:

create Model2 this transform(Model1 m) :
...

mwe2 output:

org.eclipse.emf.mwe.core.WorkflowInterruptedException: Cannot create instance of abstract class Model2
...

Can anyone help?

[Updated on: Tue, 25 January 2011 06:36] by Moderator

Re: [Xtend] Cannot create instance of abstract class [message #659580 is a reply to message #650514]

Mon, 14 March 2011 12:31

Eclipse User

Hi Ivir,

I have the same problem. Did you find out anything yet?

Re: [Xtend] Cannot create instance of abstract class [message #662328 is a reply to message #650514]

Wed, 30 March 2011 05:23

Eclipse User

An Abstract class is by definition abstract and can't be instanced, so I'm not sure what you are asking.

Re: [Xtend] Cannot create instance of model class [message #662622 is a reply to message #662328]

Thu, 31 March 2011 06:32

Eclipse User

Hallo Maxime,

I have defined a model with Xtext. And I want to instantiate one class of this model. The Xtext generator generates Interface classes and implementation classes for the model but it is neither possible to instantiate the interface what is obvious nor it is possible to instantiate the implementation class because it is not visible to the Xtend language.
The question is, how can I instantiate a class from my model?

Re: [Xtend] Cannot create instance of abstract class [message #662632 is a reply to message #650514]

Thu, 31 March 2011 07:17

Eclipse User

I never used XText, always Xtend directly, so I can't say.

You should ask your question on M2T forum, there should be more people able to help there.

Re: [Xtend] Cannot create instance of model class [message #662780 is a reply to message #662622]

Thu, 31 March 2011 17:59

Eclipse User

Hello Olaf,

On Thu, 2011-03-31 at 06:32 -0400, Olaf Bigalk wrote:
> I have defined a model with Xtext. And I want to instantiate one class of this model. The Xtext generator generates Interface classes and implementation classes for the model but it is neither possible to instantiate the interface what is obvious nor it is possible to instantiate the implementation class because it is not visible to the Xtend language.
> The question is, how can I instantiate a class from my model?

I never used Xtend. However it seems to me that the model generation you
speak about is standard EMF Ecore codegen generated code.

So it should also have generated a MyModelPackage and MyModelFactory
classes. Thoses classes will give you all of what you need.

To instanciate a ModelClassX model object do:

MyModelFactory.eInstance.createModelClassX()

Didier.

Re: [Xtend] Cannot create instance of model class [message #662916 is a reply to message #662780]

Fri, 01 April 2011 09:22

Eclipse User

Didier Villevalois wrote on Thu, 31 March 2011 17:59

Hello Olaf,

I never used Xtend. However it seems to me that the model generation you
speak about is standard EMF Ecore codegen generated code.

So it should also have generated a MyModelPackage and MyModelFactory
classes. Thoses classes will give you all of what you need.

To instanciate a ModelClassX model object do:

MyModelFactory.eInstance.createModelClassX()

Didier.

Hallo Didier,

thank you for this tip. The solution I found is this:

create MetaModelFactory makeMetaModelFactory() :
    this
;

ExpandParameter makeExpandParameter(Type this, String category, String name, String value) :
    let param = makeMetaModelFactory().createExpandParameter() :
    param.setType(this)->
    param.setCategory(category)->
    param.setVarName(name)->
    param.setValue(value)->
    param
;

[Updated on: Fri, 01 April 2011 09:23] by Moderator

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