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Xtext 2.3 Static Properties [message #895353]

Thu, 12 July 2012 14:25

Veit Hoffmann

Messages: 20
Registered: July 2009

Junior Member

Hi,

I'm trying to infer/create .java-files for a dsl.
Appart from creating methods and properies, that are described in the
DSL I need to create additional elements that are not explicitely
modelled in the DSL.
More precise I need to create a Singleton. Thus I need to create a
static property and a static method getInstance().
As an example I tried to realize this with the DomainmodelExample
Yet I didn't manage to get a satisfactory result.
So far I tried extending the ModelInferrer that comes with the example
without success. Is this possible at all? From reading the newsgroup it
looks if creating new elements static on the fly is not supported. Does
this still count for V 2.3?

If this is not possible is there an easy way to extend the
ModelGenerator or do I have to create a complete IGenerator from scratch?

Thanks in advance

Veit

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Re: Xtext 2.3 Static Properties [message #895374 is a reply to message #895353]

Thu, 12 July 2012 15:26

Christian Dietrich

Messages: 13354
Registered: July 2009

Senior Member

Hi,

why shouldnt this work

members += entity.toField("INSTANCE", it.newTypeRef()) [
				val Procedure1<ITreeAppendable> init = [it.append('''new «entity.name»();''')]
				initializer =  init
				^static = true
			]

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Xtext 2.3 Static Properties [message #895514 is a reply to message #895374]

Fri, 13 July 2012 11:09

Veit Hoffmann

Messages: 20
Registered: July 2009

Junior Member

Hi Christian,
thanks for the quick response. It works like a charm.
I tried something similar before, but i din't quite manage to get the
Closure right.

Cheers Veit

For somebody else who read this. This is the accessor method code:

members += e.toMethod("getInstance", it.newTypeRef()) [
val Procedure1<ITreeAppendable> init =
[it.append('''if(INSTANCE== null){
INSTANCE = new «e.name»();
}
return INSTANCE;''')]
body= init
^static = true
]

Am 12.07.2012 17:26, schrieb Christian Dietrich:
> members += entity.toField("INSTANCE", it.newTypeRef()) [
> val Procedure1<ITreeAppendable> init =
> [it.append('''new «entity.name»();''')]
> initializer = init
> ^static = true
> ]

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