Re: Enumerations in Tefkat

[Michael Lawley]

Damian Burger wrote:

> Does Tefkat support accessing and setting values of attributes that have
> ecore enumerations (defined in the source or target metamodel) as
their type?
> I notice there are none used in the examples and I can't seem to find a
> way to reference the enumeration literals in order access or set the
attribute.

Hi Damian,

There's no specific syntax for enums yet (suggestions are welcome), but
it is possible to use the ObjRef syntax. Unfortunately this won't help
you with the current releases since ObjRefs are not yet supported (they
will be in the next release).

Anyway, the syntax is simply <uri>. So, if you have a metamodel with
URI http:///com/example/metamode.ecore that defines the Enumeration
MyEnum with an enum literals MyLiteral, then you would write:

<http:///com/example/metamode.ecore#//MyEnum/MyLiteral>

So in future versions of Tefkat you can write rules like:

RULE MyRule
FORALL MyClass c
WHERE c.kind = <http:///com/example/metamode.ecore#//MyEnum/MyLiteral>
MAKE MyOtherClass oc;

michael

[michael lawley]

BTW, due to a "quirk" of EMF, if you're not using dynamic models (that
is, if you've generated classes for your model and have them loaded
into Eclipse such as with UML2), then you will need to refer to enums
as:

<URI_for_model#//enum/enum_literal>.instance()

Once we have a suitable syntax for enums this quirkiness will be dealt
with by the engine.

michael

[Jim Steel]

Hi,

How do I check against an Enum value?

Jim.

[michael lawley]

Perhaps:

<URI_for_model#//enum/enum_literal>.value()

this would/should invoke getValue on the EEnumLiteral which, from
distant memory, is what you get from the ref
<URI_for_model#//enum/enum_literal>

michael

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