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https://issues.apache.org/jira/browse/JENA-1427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16257367#comment-16257367
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Andy Seaborne commented on JENA-1427:
-------------------------------------
Changing {{Iter.first}} (and {{Iter.last}}) look reasonable to me.
{noformat}
RDFNode object = first(model.listObjectsOfProperty(subject, predicate))
.orElseThrow(() -> new IllegalStateException("No objects
found for subject and predicate..."));
{noformat}
I am nervous of adding to {{ExtendedIterator}} piecemeal as it is in the main
public API.
> Add nextOrElse() method in ExtendedIterator
> -------------------------------------------
>
> Key: JENA-1427
> URL: https://issues.apache.org/jira/browse/JENA-1427
> Project: Apache Jena
> Issue Type: Improvement
> Components: Core
> Affects Versions: Jena 3.5.0
> Reporter: Adam Jacobs
> Priority: Trivial
> Labels: easytask
>
> Allow a functional approach for returning a default value or throwing a
> custom exception from a Jena iterator.
> The following method may be added to the ExtendedIterator interface.
> {noformat}
> /**
> Answer the next object, if it exists, otherwise invoke the
> _supplier_.
> */
> public default T nextOrElse( Supplier<T> supplier ) {
> return hasNext() ? next() : supplier.get();
> }
> {noformat}
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