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[EDAPT] EFactory questions [message #1711028]

Mon, 12 October 2015 09:28

Eclipse User

I am wondering if someone could explain a bit about how Edapt chooses an appropriate EFactory for loading an out-dated model during migration. From what I can tell at runtime, a default EFactoryImpl is being used. However, we have extra logic in our EFactory for the createFromString method, so I need a custom implementation.

I'm trying to find if there is a "correct" or "most appropriate" way of handling this provided by the framework. If there is not a built-in method for handling this, will it be enough to retain a base version of the factory with the enhanced createFromString method, and register that to the old namespace URI(s) before migration? I haven't been able to find where the specific version of the EFactory to use for loading the old model is being set. Conceptually, I'm not certain on how I should expect Edapt to be able to handle this.

Thanks for your help!

Re: [EDAPT] EFactory questions [message #1711248 is a reply to message #1711028]

Wed, 14 October 2015 06:10

Eclipse User

Hi Brad,

sorry for the delayed reply. Johannes will get back to you today or tomorrow.

Cheers,
Maximilian

On 12.10.2015 15:28, Brad Schneider wrote:
> I am wondering if someone could explain a bit about how Edapt chooses an appropriate EFactory for
> loading an out-dated model during migration. From what I can tell at runtime, a default EFactoryImpl
> is being used. However, we have extra logic in our EFactory for the createFromString method, so I
> need a custom implementation.
>
> I'm trying to find if there is a "correct" or "most appropriate" way of handling this provided by
> the framework. If there is not a built-in method for handling this, will it be enough to retain a
> base version of the factory with the enhanced createFromString method, and register that to the old
> namespace URI(s) before migration? I haven't been able to find where the specific version of the
> EFactory to use for loading the old model is being set. Conceptually, I'm not certain on how I
> should expect Edapt to be able to handle this.
>
> Thanks for your help!

--
Maximilian Koegel

Get professional Eclipse developer support:
http://eclipsesource.com/en/services/developer-support/

Re: [EDAPT] EFactory questions [message #1711284 is a reply to message #1711248]

Wed, 14 October 2015 10:36

Eclipse User

Hi Brad,

Edapt offers an extension point to register custom efactories. We are currently working on documentation for this feature.
A preliminary version is available from here:
https://docs.google.com/document/d/1lpYRuufQkwI59TpJv3bptkru8iL3fQLbXMxC7lWqQIo/edit?usp=sharing
I will post the final link once available.

Regards
Johannes

Re: [EDAPT] EFactory questions [message #1711374 is a reply to message #1711284]

Thu, 15 October 2015 08:05

Eclipse User

Thank you guys for the replies. That was exactly what I was looking for.

Re: [EDAPT] EFactory questions [message #1713517 is a reply to message #1711374]

Wed, 04 November 2015 12:45

Eclipse User

I hate to revive an old thread, but I just realized that this appears to apply only to "top level" packages. For a sub-package within an EPackage inside of a metamodel, it is not possible to use the extension point to override the EFactory. Is this true? Is there a different way to accomplish this?

EDIT: Here's the code I'm referring to in Persistency.class:

for (final EObject element : resource.getContents()) {
				if (element instanceof EPackage) {
					final EPackage ePackage = (EPackage) element;
					FactoryHelper.INSTANCE.overrideFactory(ePackage);
					metamodelResource.getRootPackages().add(ePackage);
				}
			}

That is only iterating over top-level EPackages in the metamodel, and the call to FactoryHelper.overrideFactory(EPackage ePackage) does not iterate over sub-packages for the EPackage, either.

[Updated on: Wed, 04 November 2015 12:53] by Moderator

Re: [EDAPT] EFactory questions [message #1714011 is a reply to message #1713517]

Mon, 09 November 2015 06:49

Eclipse User

Hi Brad,

Good catch. Could you kindly create a bug-report for this?
Also contributions are always welcome Smile

Cheers
Johannes

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