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No .getEEnumLiteral() method in Enumerator interface [message #424631]

Fri, 31 October 2008 15:59

Alexander Shatalin

Messages: 2928
Registered: July 2009

Senior Member

Hello!

Why don't we have Enumerator.getEEnumLiteral() method? Is there any other
way to get appropriate EEnumLiteral/EEnum instance having only Enumerator
instance?

-----------------
Alex Shatalin

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Re: No .getEEnumLiteral() method in Enumerator interface [message #424657 is a reply to message #424631]

Fri, 31 October 2008 16:33

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Alex,

There's EEnum.getEEnumLiteralByLiteral(String) but I guess that's not
what you mean. Enumerator is in org.eclipse.emf.common and knows nothing
about Ecore. There's not much you can do with just an Enumerator instance...

Alex Shatalin wrote:
> Hello!
>
> Why don't we have Enumerator.getEEnumLiteral() method? Is there any
> other way to get appropriate EEnumLiteral/EEnum instance having only
> Enumerator instance?
>
> -----------------
> Alex Shatalin
>
>

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

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Re: No .getEEnumLiteral() method in Enumerator interface [message #424660 is a reply to message #424657]

Fri, 31 October 2008 17:15

Cameron Bateman

Messages: 481
Registered: July 2009

Senior Member

> There's EEnum.getEEnumLiteralByLiteral(String) but I guess that's not
> what you mean. Enumerator is in org.eclipse.emf.common and knows nothing
> about Ecore. There's not much you can do with just an Enumerator instance...

So if you have an Enumerator instance, e, and you know what sub-class of
EEnum you think you want a literal for, say enum, could you call:

enum.getEEnumLiteralByLiteral(e.getLiteral())?
or
enum.getEEnumLiteral(e.getValue())

I guess this would only be as type-safe as your assumption about enum.

--Cam

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Re: No .getEEnumLiteral() method in Enumerator interface [message #424663 is a reply to message #424660]

Fri, 31 October 2008 17:46

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Cameron,

Yes, in general values of data types don't know their data type the way
EObject.eClass() does. But EClassifier.isInstance lets you test to
ensure that the value conforms to the data type's Java class...

Cameron Bateman wrote:
>> There's EEnum.getEEnumLiteralByLiteral(String) but I guess that's not
>> what you mean. Enumerator is in org.eclipse.emf.common and knows
>> nothing about Ecore. There's not much you can do with just an
>> Enumerator instance...
>
> So if you have an Enumerator instance, e, and you know what sub-class
> of EEnum you think you want a literal for, say enum, could you call:
>
> enum.getEEnumLiteralByLiteral(e.getLiteral())?
> or
> enum.getEEnumLiteral(e.getValue())
>
> I guess this would only be as type-safe as your assumption about enum.
>
>
> --Cam
>
>

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

Report message to a moderator

Re: No .getEEnumLiteral() method in Enumerator interface [message #424713 is a reply to message #424657]

Mon, 03 November 2008 12:37

Alexander Shatalin

Messages: 2928
Registered: July 2009

Senior Member

Hello Ed,

> There's EEnum.getEEnumLiteralByLiteral(String) but I guess that's not
> what you mean. Enumerator is in org.eclipse.emf.common and knows
Yes, in the current code I have a place where I can get Enumerator instance
and have to return meta-object for it (EEnum instance). I know that I can
work around this place by modifying my code especially taking into account
your comment concerning other EDataType instances.

I was just thinking about the reason why Enumerator has no .eEnum() method
(just like EObject.eClass()) and it looks like it was done to keep Enumerator
interface out of dependency on ecore plugin.

Was this interface intentionally places out of Ecore?

-----------------
Alex Shatalin

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Re: No .getEEnumLiteral() method in Enumerator interface [message #424717 is a reply to message #424713]

Mon, 03 November 2008 12:59

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Alex,

Yes, it was intentional to make the interface for enumerators not
depend on Ecore. Consider for example that for an XML Schema based
model we always generated a second EDataType that wraps the generated
enum class so that the resulting EDataType supports null as a value. In
that case, there is always an EEnum and an EDataType, either of which
could be the EClassifier for the enumerator instance. You're right
though that we could have designed it differently...

Alex Shatalin wrote:
> Hello Ed,
>
>> There's EEnum.getEEnumLiteralByLiteral(String) but I guess that's not
>> what you mean. Enumerator is in org.eclipse.emf.common and knows
> Yes, in the current code I have a place where I can get Enumerator
> instance and have to return meta-object for it (EEnum instance). I
> know that I can work around this place by modifying my code especially
> taking into account your comment concerning other EDataType instances.
>
> I was just thinking about the reason why Enumerator has no .eEnum()
> method (just like EObject.eClass()) and it looks like it was done to
> keep Enumerator interface out of dependency on ecore plugin.
> Was this interface intentionally places out of Ecore?
> -----------------
> Alex Shatalin
>
>

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

Report message to a moderator

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