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Integrate Xtend with runtime EMF Instances [message #1831815]

Mon, 31 August 2020 07:12

Amar Banerjee

Messages: 14
Registered: November 2018

Junior Member

Hi everyone,

I am trying to attemp the following:-
1. I have a DSL intance (DSL file) where, I am describing my model.
2. I am trying to see if XTEND language could be further extended to import the EObject types (as described in the DSL) rather than JVM Types.
E.g.

My_Eployee{
name = 'ABC XYZ'
age =27,
role = "Developer"
}

I want the XTEND like language to be able to import the EObject Type 'Employee'. Something like this:-

import 'My_Employee'

class XTEND_LIKE_CLASS{

def checkMYDSL_EmployeeAGE(Employee emp ){
if(emp.age > 20) println('Elidigible')
}

}

Can anyone please provide any suitable direction towards how this should be achievable ?

Cheers,
Amar

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Re: Integrate Xtend with runtime EMF Instances [message #1831817 is a reply to message #1831815]

Mon, 31 August 2020 07:47

Christian Dietrich

Messages: 13939
Registered: July 2009

Senior Member

if your dsl is xbase based and you infer a jvm model from your instance dsl files, then this should work automatically

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Re: Integrate Xtend with runtime EMF Instances [message #1831819 is a reply to message #1831817]

Mon, 31 August 2020 08:38

Amar Banerjee

Messages: 14
Registered: November 2018

Junior Member

Thanks for the reply Christian.
The idea here is to have an xtend type language which works on EObject Types rather than JVM Types. The reason is it is easier to have xtend type templates which can define processing functions in the runtime instance on the DSL models. Would you suggest any other alternative to address this problem ?

Cheers,
Amar

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Re: Integrate Xtend with runtime EMF Instances [message #1831828 is a reply to message #1831819]

Mon, 31 August 2020 10:42

Christian Dietrich

Messages: 13939
Registered: July 2009

Senior Member

this wont work. to have proper integration into build cycle you need a jvm model inferer
=> anything else like generating xtend files is not officially supported

Need professional support for Xtext, Xpand, EMF?
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Blog : https://www.dietrich-it.de

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Re: Integrate Xtend with runtime EMF Instances [message #1831852 is a reply to message #1831828]

Tue, 01 September 2020 06:43

Ed Willink

Messages: 7129
Registered: July 2009

Senior Member

Hi

Xtend is a Java++, so a non-Java-based Xtend seems really weird..

If you really want an EObject-based system, have a look at UML and/or the new Pivot-based Xtext-exploiting OCL. If nothing else you will realize how much you have to re-implement once you stop re-using standard Java IDE functionalities. And if you look at Xtend more critically you will see how hard those functionalities are to extend coherently.

Regards

Ed Willink

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