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[ATL] Set boolean flag if object is referenced [message #521429]

Wed, 17 March 2010 15:07

Bernhard Lutzmann

Messages: 9
Registered: March 2010

Junior Member

Hello,

I have been playing around with ATL a little bit and am trying to solve the following:

My input model contains a collection (0...*) of classes and a reference to one of these classes.

My output model contains the same collection, but instead of the reference to one of the classes, every class contains a boolean flag.

What I want is that the transformation sets the boolean flag to "true" in the class that is referenced in the input model.

Any ideas how to accomplish this?

I tried something like the following:

module In2Out;
create OUT : OutModel from IN : InModel;

helper def : isFinishStation(station : InModel!Station) : Boolean =
   if (station = self.finishStation) then
      true
   else
      false
   endif;

rule Level2Level {
   from
      s : InModel!Level
   to
      t : OutModel!Level (
         stations <- s.stations
      )
}

rule Station2Station {
   from
      s : InModel!Station
   to
      t : OutModel!Station (
         name <- s.name,
         isFinishStation <- thisModule.isFinishStation(s)
   )
}

If I run the transformation then it produces an output model without any errors on the console.
But the boolean flag is never set to true.

Thanks for the help,
Bernhard

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Re: [ATL] Set boolean flag if object is referenced [message #521450 is a reply to message #521429]

Wed, 17 March 2010 15:50

Vincent MAHE

Messages: 129
Registered: July 2009

Senior Member

Bernhard L. a écrit :
> Hello,
>
> I have been playing around with ATL a little bit and am trying to solve
> the following:
>
> My input model contains a collection (0...*) of classes and a reference
> to one of these classes.
>
> My output model contains the same collection, but instead of the
> reference to one of the classes, every class contains a boolean flag.
>
> What I want is that the transformation sets the boolean flag to "true"
> in the class that is referenced in the input model.
>
> Any ideas how to accomplish this?
>
>
> I tried something like the following:
>
> module In2Out;
> create OUT : OutModel from IN : InModel;
>
> helper def : isFinishStation(station : InModel!Station) : Boolean =
> if (station = self.finishStation) then

Here "self" refers to the current station.... (if I'm correct).
You need to refer to the input "model" (or anything else) which have the
reference.
You may try to get "station" container [container] and see its
"finishStation" property ...

> true
> else
> false
> endif;
>
> rule Level2Level {
> from
> s : InModel!Level
> to
> t : OutModel!Level (
> stations <- s.stations
> )
> }
>
> rule Station2Station {
> from
> s : InModel!Station
> to
> t : OutModel!Station (
> name <- s.name,
> isFinishStation <- thisModule.isFinishStation(s)
> )
> }
>
>
> If I run the transformation then it produces an output model without any
> errors on the console.
> But the boolean flag is never set to true.
>
> Thanks for the help,
> Bernhard

--
Cordialement

Vincent MAHÉ

Ingénieur plate-forme - Cesar/Artemisia - Équipe Espresso
IRISA-INRIA, Campus de Beaulieu, 35042 Rennes cedex, France
Tél: +33 (0) 2 99 84 71 00, Fax: +33 (0) 2 99 84 71 71

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Re: [ATL] Set boolean flag if object is referenced [message #521578 is a reply to message #521450]

Thu, 18 March 2010 07:26

Bernhard Lutzmann

Messages: 9
Registered: March 2010

Junior Member

Vincent MAHE wrote on Wed, 17 March 2010 11:50

> helper def : isFinishStation(station : InModel!Station) : Boolean =
> if (station = self.finishStation) then

Here "self" refers to the current station.... (if I'm correct).
You need to refer to the input "model" (or anything else) which have the
reference.
You may try to get "station" container [container] and see its
"finishStation" property ...

Thanks Vincent. If I change "self.finishStation" to "station.eContainer().finishStation" then it works as expected.

Greetings,
Bernhard

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Re: [ATL] Set boolean flag if object is referenced [message #521590 is a reply to message #521429]

Thu, 18 March 2010 08:55

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

That's a bad way to define a helper; use the context :

helper context InModel!Station def : isFinishStation : Boolean =
if (station = self.eContainer().finishStation) then

and then just use it like that : s.isFinishStation

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