| [qvto]can I use an ocl operation as a model attribute [message #829953] |
Mon, 26 March 2012 21:52  |
Eclipse User |
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When doing transformation, I may choose an element using ocl operations.
e.g. var s := source.objectsOfType(A)->select(i | i.name="name1")
But I want to define an element (e1) with an attribute (a1), may be a String ('source.objectsOfType(A)->select(i | i.name="name1")'),
so I can choose the elements like this:
var s := someOperation(e1.a1)
can I do this?Or is there some way?
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| Re: [qvto]can I use an ocl operation as a model attribute [message #846699 is a reply to message #846534] |
Mon, 16 April 2012 04:33  |
| Eclipse User |
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Hi
Today: I don't think so. But the evolution of the OCL specification to
recognize iteration bodies as Lambda Expressions could allow it in the
future.
One possible workaround is to define a Predicate class and
select(OclAny) operation so that you can do
var element := aPredicate.select(a);
and pass alternate Predicate instances.
OCL currently has no ability to dynamically parse a Concrete Syntax
string, though I've raised an OMG issue to add support.
Regards
Ed Willink
On 16/04/2012 07:31, Allen Zhang wrote:
> Hi, sorry about my poor English.
> The question is:
> when I write qvto transformation codes, I may need to select some
> elements.
> such as: var element := a.select(i | i.name="name1");
>
> But in this way, there is a limit that I can not dynamically set the
> condition: "i | i.name="name1".
>
> I wander if I can set this condition in my source model, may be a
> String attribute.
> so in the transformation, my codes will be like this:
> var element := a.select(b.condition);
>
> should I import ocl ecore in model b's metamodel, and set condition's
> type oclExpression?
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