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eContainer becomes null after model transformation [message #1692263]

Tue, 14 April 2015 15:53

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi all,

I have a language something like:

entity MyEntity {
x=5
MyObj[x] {
...
}
}

So when generators are called I transform my model and MyObj[x] will be transformed to 5 copies . Something like MyObj_1, MyObj_2, MyObj_3, MyObj_4 and MyObj_5.

And then I set the new references created and remove the old reference from entity MyEntity I.e. my root object.

But after transformation all the 5 objects loses eContainer information and it becomes null... Any idea and suggestions?

Thanks for any help Smile

Arshad

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Re: eContainer becomes null after model transformation [message #1692264 is a reply to message #1692263]

Tue, 14 April 2015 15:56

Sebastian Zarnekow

Messages: 3109
Registered: July 2009

Senior Member

Please provide more information, e.g how do you trigger your code /
transformation?

Best,
Sebastian
--
Looking for professional support for Xtext, Xtend or Eclipse Modeling?
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Re: eContainer becomes null after model transformation [message #1692269 is a reply to message #1692263]

Tue, 14 April 2015 16:32

Ed Willink

Messages: 7099
Registered: July 2009

Senior Member

Hi

Seems like a classic case of child-stealing.

See page 6 of
https://www.eclipse.org/mmt/qvt/docs/ICMT2014/QVTtraceability.pdf.

Put

@Override
protected void eBasicSetContainer(InternalEObject newContainer, int
newContainerFeatureID) {
if (newContainer != null) {
EObject oldContainer = eInternalContainer();
assert (oldContainer == null) || oldContainer.eIsProxy() ||
(newContainer == oldContainer) || (oldContainer.eResource() == null);
}
super.eBasicSetContainer(newContainer, newContainerFeatureID);
}

in your root EObjectImpl and it'll show you where it happens.

Regards

Ed Willink

On 14/04/2015 16:53, Arshad Adavani wrote:
> Hi all,
>
> I have a language something like:
>
> entity MyEntity {
> x=5
> MyObj[x] {
> ..
> }
> }
>
> So when generators are called I transform my model and MyObj[x] will
> be transformed to 5 copies . Something like MyObj_1, MyObj_2, MyObj_3,
> MyObj_4 and MyObj_5.
>
> And then I set the new references created and remove the old reference
> from entity MyEntity I.e. my root object.
>
> But after transformation all the 5 objects loses eContainer
> information and it becomes null... Any idea and suggestions?
>
>
> Thanks for any help :)

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Re: eContainer becomes null after model transformation [message #1692275 is a reply to message #1692264]

Tue, 14 April 2015 16:56

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi Sebastian,

Thanks for your reply..

After the save of the file, when dogenerate() method is called, I call a function to transform my model.

Here I do nothing special than using,

var newObj=EcoreUtil.copy(original object)

And then renaming newObj.name to MyObj_1, so on..

And after this i have eContainer set to null...

Not sure what's going wrong..

Regards,
Arshad

Arshad

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Re: eContainer becomes null after model transformation [message #1692294 is a reply to message #1692275]

Tue, 14 April 2015 21:05

Sebastian Zarnekow

Messages: 3109
Registered: July 2009

Senior Member

#doGenerate is not supposed to modify the resource. You may want to
create a copy, manipulate that and save it afterwards. That would
probably work for you. I'm still not sure what you expected from that
transformation or what you wanted to do with the transformation result.
Information like this would help to give better advice.

Best,
Sebastian
--
Looking for professional support for Xtext, Xtend or Eclipse Modeling?
Find help at http://xtext.itemis.com or xtext(@)itemis.com
Blog: zarnekow.blogspot.com
Twitter: @szarnekow
Google+: https://www.google.com/+SebastianZarnekow

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