[jira] [Updated] (GROOVY-10223) Add support for Optional to DefaultTypeTransformation.asCollection()

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles updated GROOVY-10223:
---------------------------------
    Issue Type: Improvement  (was: New Feature)

> Add support for Optional to DefaultTypeTransformation.asCollection()
> --------------------------------------------------------------------
>
>                 Key: GROOVY-10223
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10223
>             Project: Groovy
>          Issue Type: Improvement
>          Components: groovy-jdk
>            Reporter: Stephen Smith
>            Assignee: Eric Milles
>            Priority: Trivial
>              Labels: features
>
> The JDK recently added support for *Optional::stream()* which returns a stream containing either the unwrapped value or an empty stream if the *Optional* is empty.
> In the groovy-jdk, using iteration however will call
> {noformat}
> DefaultTypeTransformation.asCollection(){noformat}
> which does not specifically check for type *Optional*, instead it will just wrap the *Optional* itself in a *List* rather than the unwrapped value as the default behavior.
> Adding an _if else_ clause will allow using the Optional as either a single or empty list.
> {code:java}
> if (value instanceOf Optional) {
>    return ((Optional)value).map(List::of).orElse(List.of())
> }{code}
>  Alternatively, add an *asList()* to the Optional class.
>  (edit: 2021-09-13, missing bracket in code example)
>  



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