[jira] [Closed] (GROOVY-9817) Enhance Closure annotation value (as Closure class) to Arrays

["Paul King (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-9817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-9817.
-----------------------------

> Enhance Closure annotation value (as Closure class) to Arrays
> -------------------------------------------------------------
>
>                 Key: GROOVY-9817
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9817
>             Project: Groovy
>          Issue Type: New Feature
>            Reporter: Paul King
>            Assignee: Paul King
>            Priority: Major
>             Fix For: 3.0.7, 4.0.0-alpha-2
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> The background for this request is annotations in the [picocli|https://picocli.info/] library. The annotations API of this library allows applications to specify a class or an array of classes to customize some behaviour. For example:
> {code:java}
> // current picocli (4.5.2) requires explicit class(es), does not support Closures
> @Option(names = "-x",
>         completionCandidates = MyCandidates.class, 
>         converter = [StringConverter.class, MessageDigestConverter.class])
> Map<String, MessageDigest> someOption;
> {code}
> There is [work in progress|https://github.com/remkop/picocli/issues/1258] in the picocli library to allow applications to specify closures for such classes in the annotations. For example, I would like applications to be able to do this:
> {code:java}
> // next version of picocli (4.6.0) aims to support Closures in these annotation attributes
> @picocli.CommandLine.Option(names = "-x",
>         completionCandidates = {["A", "B", "C"]},
>         converter = [ {it}, { str -> java.security.MessageDigest.getInstance(str) } ])
> Map<String, java.security.MessageDigest> someOption
> {code}
> With the current version of Groovy (3.0.6), this works for the single-value attributes like {{completionCandidates}}, but does not work for attributes that take an array of values, like {{converter}}.
> Please add support for arrays in the Closure to Class conversion for annotations.
> See also [discussion|https://lists.apache.org/thread.html/rcd541adf064adb6839b79c889a5778a80739837a58adce523f86e660%40<dev.groovy.apache.org>] on the groovy-dev mailing list.



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