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Redefining attribute [message #429578]

Sat, 25 April 2009 14:13

weevee

Messages: 5
Registered: July 2009

Junior Member

Hello,

I have a superclass A (with 4 attributes with EType: EInt)
A has some subclasses B,C,..
B also has subclasses D,E
In class D I want to give my attribute another default value.
=> I make new attribute with the same name => redefine the attribute (like
Java)

But this doesn't work...
Problem: There may not be two features named 'attribute1'

Could somebody give a solution

Thanks a lot
Grtz

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Re: Redefining attribute [message #429581 is a reply to message #429578]

Sat, 25 April 2009 14:33

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Grtz,

There's simply no support for this. The default is fixed at the point
where the feature is defined and you can't redefine a feature in a
derived class.

weevee wrote:
> Hello,
>
> I have a superclass A (with 4 attributes with EType: EInt)
> A has some subclasses B,C,..
> B also has subclasses D,E
> In class D I want to give my attribute another default value.
> => I make new attribute with the same name => redefine the attribute
> (like Java)
>
> But this doesn't work...
> Problem: There may not be two features named 'attribute1'
>
> Could somebody give a solution
>
> Thanks a lot
> Grtz
>

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Redefining attribute [message #429589 is a reply to message #429581]

Sun, 26 April 2009 20:23

weevee

Messages: 5
Registered: July 2009

Junior Member

Hello,

Thanks for your very quick answer!
Is there a reason why it's not implemented? Or can you give a link where I
can find some information.

Thanks
Grtz

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Re: Redefining attribute [message #429590 is a reply to message #429589]

Sun, 26 April 2009 22:02

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Grtz,

A feature is like a field and even in Java if you define a field with
the same name in a derived class it's a different field than the one in
the base class, not a redefinition of the base classes field.
Redefinition is simply not something Java supports nor something that
Ecore/EMOF supports.

weevee wrote:
> Hello,
>
> Thanks for your very quick answer!
> Is there a reason why it's not implemented? Or can you give a link
> where I can find some information.
>
> Thanks
> Grtz
>

Ed Merks
Professional Support: https://www.macromodeling.com/

Report message to a moderator

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