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Home » Modeling » M2T (model-to-text transformation) » [Acceleo] Working with multiple input models and metamodels([Acceleo] How can I generate code from two models having two different underlying metamodels or from two models having the same underlying metamodel?)

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[Acceleo] Working with multiple input models and metamodels [message #1784101]

Thu, 22 March 2018 14:47

Novarun Deb

Messages: 3
Registered: February 2018

Junior Member

I have a very clear scenario. I want to work with two input models in an Acceleo project. These two models may have the same or different underlying metamodels. I have tried all possible permutation of code syntax but none works.

I know that Acceleo supports defining multiple metamodels as follows:

[module generate('http://www.eclipse.org/uml2/5.0.0/UML', 'http://www.xtext.org/example/novadsl/NovaDsl')]

where i am working with the UML metamodel and a metamodel of my own DSL defined using XText. However, I cannot take as input two different models for the two metamodels using the following syntax:

[template public generateElement(bModel : Model, aModel : Model)]
[comment @main/]
....
[/template]

When I try to run this acceleo project i get the following exception:

Exception in thread "main" org.eclipse.acceleo.engine.AcceleoEvaluationException: Could not find public template generateElement in module generate.
at org.eclipse.acceleo.engine.service.AcceleoService.findTemplates(AcceleoService.java:1201)
at org.eclipse.acceleo.engine.service.AcceleoService.doGenerate(AcceleoService.java:616)
at org.eclipse.acceleo.engine.service.AbstractAcceleoGenerator.generate(AbstractAcceleoGenerator.java:209)
at org.eclipse.acceleo.engine.service.AbstractAcceleoGenerator.generate(AbstractAcceleoGenerator.java:172)
at org.eclipse.acceleo.engine.service.AbstractAcceleoGenerator.doGenerate(AbstractAcceleoGenerator.java:159)
at org.eclipse.acceleo.ndslmult2txt.main.Generate.doGenerate(Generate.java:204)
at org.eclipse.acceleo.ndslmult2txt.main.Generate.main(Generate.java:162)

The same problem persists when I have only one metamodel in the [module generate......], i.e., irrespective of the number of metamodels that I include in my generate.mtl file, Acceleo cannot accept more than one input model in the current settings.

Is there a solution or workaround to this problem? I just want to work with 2 input models (irrespective of the number of metamodels) in an Acceleo project.

If this is possible,then can you kindly give a step-by-step tutorial how this can be done!!

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Re: [Acceleo] Working with multiple input models and metamodels [message #1784102 is a reply to message #1784101]

Thu, 22 March 2018 14:58

Ed Willink

Messages: 7676
Registered: July 2009

Senior Member

Hi

Sorry. There comes a point when you have to learn how powerful the Eclipse debugger is. It's how I solve most of my problems.

Regards

Ed Willink

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Re: [Acceleo] Working with multiple input models and metamodels [message #1784108 is a reply to message #1784102]

Thu, 22 March 2018 15:42

Novarun Deb

Messages: 3
Registered: February 2018

Junior Member

Sorry. But as far as i understood from the debugger, the Acceleo evaluation Could not find public template generateElement in module generate. This is because there are 2 paramteres of this function given for working with 2 input models. The project works fine with 1 input model.

Is there a way in which i can work with 2 input models of the same metamodel?

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Re: [Acceleo] Working with multiple input models and metamodels [message #1784117 is a reply to message #1784108]

Thu, 22 March 2018 16:05

Ed Willink

Messages: 7676
Registered: July 2009

Senior Member

Hi

The Generate.java is there as a good starting example. I found that as I needed more interesting functionality, I needed to rewrite some parts and overload some inherited bits. maybe you have to rewrite for two arguments.

Regards

Ed Willink

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Re: [Acceleo] Working with multiple input models and metamodels [message #1784229 is a reply to message #1784117]

Fri, 23 March 2018 18:15

Mad Vin

Messages: 40
Registered: September 2013

Member

Hi,

I've already read a post about this before.
If I remember correctly, the solution is to manage the second input model in the java file of your main generator module. You can specify it by parameter in the program launcher, receive it in the main method, then load it manually in Acceleo.

Regards.

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