Home » Modeling » EMF » Contextual EMF Factories ?
| Contextual EMF Factories ? [message #800043] |
Thu, 16 February 2012 16:11  |
 Camille Letavernier
Messages: 952
Registered: February 2011 |
Senior Member |
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Hello,
Here's my problem: I'd want to provide a specific implementation for the GMF Notation Metamodel.
It can be easily done through the org.eclipse.emf.ecore.factory_override extension point. I can register my own GMF Factory, which will instantiate my own Notation objects. However, it would contaminate any GMF-based diagram, which might quickly become a problem.
So, I was looking for a way to define a contextual Factory. This seems to be possible in a resource parser:
getResourceSet().getPackageRegistry().put(NotationPackage.eNS_URI, myNotationPackage);
However, the factory associated to my own EPackage implementation will only be used during the resource loading. When creating new elements, the default, static, singleton one will be used (Unless I find & override each and every call to it, which is most likely impossible  )
So, here's the question: is there a way to use a contextual EMF Factory for a shared metamodel, which I can't modify directly ? Are there plans do make this possible in the future (Relying, for example, on E4 Contexts and Dependency Injection) ? Or is there another way to solve the initial problem, which is to have my own implementation of GMF notation elements in my own Diagrams ?
Thank you,
Camille
Camille Letavernier
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| Re: Contextual EMF Factories ? [message #800054 is a reply to message #800043] |
Thu, 16 February 2012 16:22  |
Ed Merks
Messages: 33133
Registered: July 2009 |
Senior Member |
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Camille,
No, sorry can't think of a way to do this for direct uses of
NotationFactory.eINSTANCE in the GMF framework. If I recall correctly,
the Notation model extends EModelElement so it's possible to add
EAnnotations to it. Perhaps you can use this to decorate Notation model
instance with your additional information...
On 16/02/2012 5:11 PM, Camille Letavernier wrote:
> Hello,
>
>
> Here's my problem: I'd want to provide a specific implementation for
> the GMF Notation Metamodel.
>
> It can be easily done through the
> org.eclipse.emf.ecore.factory_override extension point. I can register
> my own GMF Factory, which will instantiate my own Notation objects.
> However, it would contaminate any GMF-based diagram, which might
> quickly become a problem.
>
> So, I was looking for a way to define a contextual Factory. This seems
> to be possible in a resource parser:
>
> getResourceSet().getPackageRegistry().put(NotationPackage.eNS_URI,
> myNotationPackage);
>
> However, the factory associated to my own EPackage implementation will
> only be used during the resource loading. When creating new elements,
> the default, static, singleton one will be used (Unless I find &
> override each and every call to it, which is most likely impossible :) )
>
>
> So, here's the question: is there a way to use a contextual EMF
> Factory for a shared metamodel, which I can't modify directly ? Are
> there plans do make this possible in the future (Relying, for example,
> on E4 Contexts and Dependency Injection) ? Or is there another way to
> solve the initial problem, which is to have my own implementation of
> GMF notation elements in my own Diagrams ?
>
>
> Thank you,
> Camille
Ed Merks
Professional Support: https://www.macromodeling.com/
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