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https://issues.apache.org/jira/browse/GROOVY-10223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558521#comment-17558521
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Eric Milles edited comment on GROOVY-10223 at 6/24/22 2:55 PM:
---------------------------------------------------------------
Since the "iterator()" for Object delegates to
{{DefaultTypeTransformation#asCollection}} an addition there would have a side
benefit of iterator support.
{code:java}
public static Iterator iterator(Object o) {
return DefaultTypeTransformation.asCollection(o).iterator();
}
{code}
I'm looking now to see what uses {{DefaultTypeTransformation#asCollection}} as
I don't see it as part of {{castToType}}.
was (Author: emilles):
Since the "iterator()" for Object delegates to
{{DefaultTypeTransformation#asCollection}} an addition there would have a side
benefit of iterator support.
{code:java}
public static Iterator iterator(Object o) {
return DefaultTypeTransformation.asCollection(o).iterator();
}
{code}
I'm just looking now ti see what uses
{{DefaultTypeTransformation#asCollection}} as I don't see it as part of
{{castToType}}.
> Add support for Optional to DefaultTypeTransformation.asCollection()
> --------------------------------------------------------------------
>
> Key: GROOVY-10223
> URL: https://issues.apache.org/jira/browse/GROOVY-10223
> Project: Groovy
> Issue Type: New Feature
> 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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