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[EReference] How to change its referred EClass [message #423041]

Mon, 22 September 2008 02:13

Wang Liang

Messages: 5
Registered: July 2009

Junior Member

Hi, All,

I met a problem. How can I change EReference's referred EClass. There is
getEReferenceType method to retrieve information about this EClass.
However, it seems no way to change it.

Thanks.

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Re: [EReference] How to change its referred EClass [message #423042 is a reply to message #423041]

Mon, 22 September 2008 03:01

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

Wang,

Use setEType. EReference.eReferenceType and EAttribute.eAttributeType
are each derived from EStructuralFeature.eType.

Wang Liang wrote:
> Hi, All,
>
> I met a problem. How can I change EReference's referred EClass. There
> is getEReferenceType method to retrieve information about this EClass.
> However, it seems no way to change it.
>
>
> Thanks.
>

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

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Re: [EReference] How to change its referred EClass [message #1790411 is a reply to message #423042]

Sat, 09 June 2018 20:01

Paul Roubekas

Messages: 207
Registered: March 2012
Location: Chattanooga, TN USA

Senior Member

I am on EMF 2.13.0

Auto complete does not show anything of the pattern setEType.*

What Property setting is needed on the EReference in the .ecore model for the setEType method to be generated by "Generate Model Code"?

Please see attached screen captures of more details.

Attachment: Snap16.pdf
(Size: 102.13KB, Downloaded 95 times)
Attachment: Snap17.pdf
(Size: 117.75KB, Downloaded 88 times)

Oxygen 3a
Windows 10

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Re: [EReference] How to change its referred EClass [message #1790415 is a reply to message #1790411]

Sun, 10 June 2018 07:36

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

You appear to be confusing metamodel levels.

The ETypedElement.setEType(EClassifier) is available in EReference since Ecore.ecore defines an ETypedElement.eType property and because EReference is derived from ETypedElement.

If you do not see setEType in the JDT editor when the source context is an EReference, then either this is a bug in JDT (very unlikely) or you have managed to adjust JDT's preferences so that this completion is not offered. I have accidentally dug this hole once, it is very confusing. I strongly recommend keeping completion preferences at their defaults. Reset them in the preference page.

(Note the the definition of ETypedElement.eType the the Ecore metamodel is itself defined by an EReference from the Ecore metametmodel, which is also Ecore.ecore).

In the more conventional direction, a setEType will only be generated for a DepictionPart in your model if you define a DepictionPart.eType property. What this property will do is dependent on your implementation. You appear to be looking for re-classification which neither EMF nor most other OO technologies support. You can implement it in EMF but it is very tricky and certainly not a recommended approach for a non-expert.

More likely you want the concept of a Role, which unfortunately has other meanings making a Google search hard. "reclassification role metamodel" finds "Extending OO Metamodels Towards Dynamic Object Roles" for me.
https://pdfs.semanticscholar.org/cda2/2f50302d0e63dfe2d0d0e372511d76794549.pdf

Regards

Ed Willink

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Re: [EReference] How to change its referred EClass [message #1790417 is a reply to message #1790415]

Sun, 10 June 2018 08:11

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

I can't tell what type "d" is but it appears to have no setter methods. If its is Depication there will only be a getDepicationParts method which returns a list to which you can add DepicationPart instances. In no case is a setter generated for a multi-valued feature because the getter returns a list that can be modified. You should only expect a setEType method if you've modeled a single-valued feature named eType.

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

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