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Is there a way to automatically display the classes children of other classes? [message #1852391]

Fri, 13 May 2022 14:44

Namea lasta

Messages: 50
Registered: March 2022

Member

Hello,
Lets say i have a metamodel that contains a class A : "car" and a class B : "motor" inside it.

Is is possible to make that whenever a user create a classe "car", then a class "motor" is automatically created?

Adding to that, both should be displayed.

Thanks

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Re: Is there a way to automatically display the classes children of other classes? [message #1852398 is a reply to message #1852391]

Fri, 13 May 2022 18:19

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Your question is "context free". Of course you can create a "car" and a "motor" and if the "car" has a "motor" containment reference you can set the car's motor. But you mention a "user" doing this so I guess this is a question about an editor, I guess the generated editor.

The generated editor uses item providers to create new instances and you can specialize the methods that create such instances, e.g., have a look at org.eclipse.emf.ecore.provider.EModelElementItemProvider.collectNewChildDescriptors(Collection<Object>, Object) where we specialize the creation to create several "pre-populated" EAnnotation instances.

In general, set a breakpoint in the CarImpl constructor and you will see where/where the editor (or wizard) is creating instances and then you know where to specialize the code to also create a motor.

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

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Re: Is there a way to automatically display the classes children of other classes? [message #1852426 is a reply to message #1852398]

Mon, 16 May 2022 07:31

Namea lasta

Messages: 50
Registered: March 2022

Member

Very interesting!
I am still a beginner in EMF, i will level up and probably come back here to reread your answer and see how I can implement his. Will write a new answer then.

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