[news.eclipse.modeling.gmt] Re: OAW - Type Casting with XTend

[Alexander Nyßen <any@xxxxxxxxxxxxxxxxxx>]

Yes of course they are not in the same hierarchy, that's why I indeed need 
the cast!
Just assume e.role is a Property, which is a ConnectableElement as well as 
MultiplicityElement.

Best Regards
Alexander Nyßen


"Karsten Thoms" <karsten.thoms@xxxxxxxxx> schrieb im Newsbeitrag 
news:g3qkt1$njg$1@xxxxxxxxxxxxxxxxxxxx
> Hi Alexander,
>
> you get this error because those types are not in a type hierarchy and 
> cannot be casted therefore.
>
> The type hierarchy is as follows:
>
> Element <- NamedElement <- TypedElement <- ConnectableElement
> Element <- MultiplicityElement
>
> You may consult the UML2 superstructure. Seems that the 
> ConnactableElement's role is not an MultiplicityElement.
>
> ~Karsten
>
> Alexander Nyßen schrieb:
> > I have specified the following in my Extension:
> >
> > cached int getConnectorCount(uml::ConnectorEnd e) :
> > uml::MultiplicityElement.isInstance(e.role) ?
> >  e.getPartWithPortMultiplicity() * e.upper() * 
> > ((uml::MultiplicityElement)e.role).upper()
> >     : e.getPartWithPortMultiplicity() * e.upper()
> > ;
> >
> > The cast of e.role into MultiplicityElemenet is acknowledged by the OAW 
> > environement with the error "cannot cast from uml::ConnectableElement 
> > into uml::MultiplicityElement". The dynamic type of e.role may however by 
> > a MultiplicityElement. What am I doing wrong?