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Transitions with Guards in StateMachines [message #187904]

Tue, 20 May 2008 07:49

Eclipse User

Originally posted by: hedayati.tzi.de

Hi,

I try to build a statemachine with gmf. Therefor I have defined an
Ecore-Class Transition with a reference (containment) to an Ecore-Class
Expression (like clas Constraint) for a guard of the transition and a
reference to an Ecore-Class Action for an effect that could be triggered.

The usual way is to map the Transition as a link, but if I do so, there
is no way to specify a guard or an effect for the transiton. I can only
add attributes to the Transition Ecore-Class for an effect or a guard,
but they are only EString or Strings with no reference to the above
mentioned Ecore-Classes.

Thanks and best regards

Ramin

Re: Transitions with Guards in StateMachines [message #187919 is a reply to message #187904]

Tue, 20 May 2008 08:07

Eclipse User

Hello Ramin,

I think it's not a problem to add containment reference to Transition Ecore-Class
- the question is how to make GMF displace corresponding child element properties
as a link label.

Elegant solution is: add derived transient volatile attribute "guard" into
Transition Ecore-Class and implement corresponding getGuard()/setGuard()
methods in generated TransitionImpl class to parse passed string implementation
and set create corresponding child elements/set their properties.

Another possible solution (if you can not modify meta-model) is: plug in
custom parser doing this parsing/creating elemtns..

-----------------
Alex Shatalin

Re: Transitions with Guards in StateMachines [message #187926 is a reply to message #187904]

Tue, 20 May 2008 08:16

Eclipse User

Originally posted by: hedayati.tzi.de

Sorry,

I forgot the question:

is there a way to get a guard and an effect to the Transition Connection
in the mapping, so that guard is an Expression and effect is an Action
(reference this class)?

Regards

Ramin

Ramin Hedayati schrieb:
> Hi,
>
> I try to build a statemachine with gmf. Therefor I have defined an
> Ecore-Class Transition with a reference (containment) to an Ecore-Class
> Expression (like clas Constraint) for a guard of the transition and a
> reference to an Ecore-Class Action for an effect that could be triggered.
>
> The usual way is to map the Transition as a link, but if I do so, there
> is no way to specify a guard or an effect for the transiton. I can only
> add attributes to the Transition Ecore-Class for an effect or a guard,
> but they are only EString or Strings with no reference to the above
> mentioned Ecore-Classes.
>
>
> Thanks and best regards
>
> Ramin

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