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Date: Thu, 6 Oct 2016 12:11:22 +0000 (UTC)
From: =?utf-8?Q?C=C3=A9dric_Champeau_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Commented] (GROOVY-7956) Allow @DelegatesTo on named
 arguments
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archived-at: Thu, 06 Oct 2016 12:11:24 -0000


    [ https://issues.apache.org/jira/browse/GROOVY-7956?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D155=
51773#comment-15551773 ]=20

C=C3=A9dric Champeau commented on GROOVY-7956:
-----------------------------------------

Another option is to remove the {{Map}} version altogether, and rely on an =
annotation to tell that we allow named arguments:

{{code}}
void animal(@NamedArguments Animal foo, ...) { ... }
{{code}}

which would allow the method to be called both with a map and an {{Animal}}=
, without having to define the method twice. In addition, since we use "rea=
l" types here, there's no generic type information loss.

> Allow @DelegatesTo on named arguments
> -------------------------------------
>
>                 Key: GROOVY-7956
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7956
>             Project: Groovy
>          Issue Type: New Feature
>          Components: GEP
>            Reporter: Graeme Rocher
>
> In order to aid static compilation for builders we have {{@DelegatesTo}} =
which allows statically compiled code to know what the delegate of a closur=
e is.
> This proposal is to allow {{@DelegatesTo}} on {{Map}} types such that IDE=
s and the static compiler can resolve the target type the named arguments a=
re to be used on.
> For example:
> {code}
> class Farm {
>      void animal(@DelegatesTo(Animal) Map arguments, @DelegatesTo(AnimalB=
uilder) Closure callable) {
>              def animal =3D new Animal(arguments)
>              // handle closure
>     }
> }=20
> class Animal { String name }
> {code}
> The following code would then fail to compile :
> {code}
> def farm =3D new Farm()
> // compilation failure, no name property on Animal
> farm.animal(nam: "Dog")  {=20
> }
> {code}
> It would then be down to IDEs to also provide support for code completion=
 etc.


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