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From Cédric Champeau (JIRA) <j...@apache.org>
Subject [jira] [Comment Edited] (GROOVY-7956) Allow @DelegatesTo on named arguments
Date Thu, 06 Oct 2016 12:11:22 GMT

    [ https://issues.apache.org/jira/browse/GROOVY-7956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15551773#comment-15551773
] 

Cédric Champeau edited comment on GROOVY-7956 at 10/6/16 12:11 PM:
-------------------------------------------------------------------

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

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

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 "real" types here, there's no generic
type information loss.


was (Author: melix):
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 "real" 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 closure is.
> This proposal is to allow {{@DelegatesTo}} on {{Map}} types such that IDEs and the static
compiler can resolve the target type the named arguments are to be used on.
> For example:
> {code}
> class Farm {
>      void animal(@DelegatesTo(Animal) Map arguments, @DelegatesTo(AnimalBuilder) Closure
callable) {
>              def animal = new Animal(arguments)
>              // handle closure
>     }
> } 
> class Animal { String name }
> {code}
> The following code would then fail to compile :
> {code}
> def farm = new Farm()
> // compilation failure, no name property on Animal
> farm.animal(nam: "Dog")  { 
> }
> {code}
> It would then be down to IDEs to also provide support for code completion etc.



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