[jira] [Updated] (SLING-8758) Add Adaptable method with a non-null return value

["Radu Cotescu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLING-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radu Cotescu updated SLING-8758:
--------------------------------
    Fix Version/s:     (was: API 2.20.2)

> Add Adaptable method with a non-null return value
> -------------------------------------------------
>
>                 Key: SLING-8758
>                 URL: https://issues.apache.org/jira/browse/SLING-8758
>             Project: Sling
>          Issue Type: Improvement
>          Components: API
>            Reporter: Robert Munteanu
>            Priority: Major
>
> We have had long-standing discussions about the fact that {{adaptTo}} returning null can lead to many hard-to-trace bugs.
> One option of evolving the API is to add a default method to the adaptable which returns an optional
> {code:java}
>     default @NotNull <AdapterType> Optional<AdapterType> tryAdapt(@NotNull Class<AdapterType> type) {
>         return Optional.ofNullable(adaptTo(type));
>     }
> {code}
> This can in turn be used by clients to check that the adaption succeeed in a more fluent way
> {code:java}
> MyAdapted resource = resource.tryAdapt(MyAdapted.class)
>             .orElseThrow( () -> new RuntimeException("Adaption failed") )
>             .get();{code}
> or enable functional API usage patterns
> {code:java}
> MyAdapted resource = resource.tryAdapt(MyAdapted.class)
>         .ifPresent( a ->  consume(a) );
> {code}



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