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Object multiplicity in the diagram [message #220086]

Thu, 26 February 2009 16:47

Marcin Cylke

Messages: 61
Registered: July 2009

Member

Hello
I'm generating a GMF editor from an ecore model. I have some parent object
that should be placed on the diagram - lets call it A. It can have one
object B and 0..* objects B. I've specified that condition in Ecore model,
but generated diagram does not obey that, and I have to place object B by
myself. Moreover, I'm able to place more B-objects than one.

How can I force such object's multiplicity?

Marcin

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Re: Object multiplicity in the diagram [message #220162 is a reply to message #220086]

Fri, 27 February 2009 07:53

Adrian Gygax

Messages: 14
Registered: July 2009

Junior Member

Hi Marcin,

Cardinalities defined in the ecore model are not translated by GMF into
validations automatically. You have to take further manual steps for that.

If you want to automatically create a B if A ist created, you can modify
doDefaultElementCreation() in your ACreateCommand class to
programmatically add a B object to the newly created A object.

To validate the cardinalities you can use GMF's validation functionality
which is introduced here:
http://wiki.eclipse.org/GMF_Tutorial_Part_2#Validation

Adrian

Marcin Cylke schrieb:
> Hello
> I'm generating a GMF editor from an ecore model. I have some parent
> object that should be placed on the diagram - lets call it A. It can
> have one object B and 0..* objects B. I've specified that condition in
> Ecore model, but generated diagram does not obey that, and I have to
> place object B by myself. Moreover, I'm able to place more B-objects
> than one.
>
> How can I force such object's multiplicity?
>
> Marcin
>

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