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[Dynamic EMF] StackOverflow when using eSet [message #419630]

Thu, 29 May 2008 16:04

Matthias Schoettle

Messages: 44
Registered: July 2009

Member

I have a EMF Model with a class that has some attributes (only one in my
example). Now I want to add an attribute dynamically which works. When I
create an instance of this class and try to set this dynamic attribute
using eSet() I get a StackOverflowException.

I debugged a bit and found out that this is due to eStaticFeatureCount()
returning 2, but only 1 static feature exists, i.e. it's not looking for
CLASSNAME_FEATURE_COUNT in the generated Package interface.

This is how I added the EAttribute:

EAttribute testId = EcoreFactory.eINSTANCE.createEAttribute();
testId.setName("testId");
testId.setEType(EcorePackage.eINSTANCE.getEInt());

BugtestPackage.eINSTANCE.getTestClass().getEStructuralFeatur es().add(testId);

TestClass testClass = (TestClass) resource.getContents().get(0);
testClass.eSet(testId, 1);

Is this not possible or did I do anything wrong?

Thanks in advance
Matthias

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Re: [Dynamic EMF] StackOverflow when using eSet [message #419631 is a reply to message #419630]

Thu, 29 May 2008 16:09

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

Matthias,

Comments below.

Matthias Schoettle wrote:
> I have a EMF Model with a class that has some attributes (only one in
> my example). Now I want to add an attribute dynamically which works.
Oh? Is this a generated model? It's not valid to modify a generated model.
> When I create an instance of this class and try to set this dynamic
> attribute using eSet() I get a StackOverflowException.
So it's not working so well. :-P
>
> I debugged a bit and found out that this is due to
> eStaticFeatureCount() returning 2, but only 1 static feature exists,
> i.e. it's not looking for CLASSNAME_FEATURE_COUNT in the generated
> Package interface.
Yes, this is not supported.
>
> This is how I added the EAttribute:
>
> EAttribute testId = EcoreFactory.eINSTANCE.createEAttribute();
> testId.setName("testId");
> testId.setEType(EcorePackage.eINSTANCE.getEInt());
>
>
> BugtestPackage.eINSTANCE.getTestClass().getEStructuralFeatur es().add(testId);
>
>
> TestClass testClass = (TestClass) resource.getContents().get(0);
> testClass.eSet(testId, 1);
>
> Is this not possible or did I do anything wrong?
It's not valid. You can create a new EPackage, with a new EClass that
extends the generated EClass and add a new attribute to that EClass, but
you can't modify a generated model. It should be treated as immutable.
>
>
> Thanks in advance
> Matthias

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

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