@Override
public Set<AccessionLink> getAccessionLinks(ElementState state)
{
	return this.accessionLinks.stream().filter(element -> state.check(element.isDeleted())).collect(Collectors.toSet());
}

override Set<JpaAccessionLink> getAccessionLinks(ElementState state)
{
	accessionLinks.stream.filter(e | state.check(deleted)).collect(Collectors.toSet)
}

override Set<DescriptionAreaLink> getDescriptionAreaLinks(ElementState state)
{
	return this.descriptionAreaLinks.stream.filter[e | state.check(e.isDeleted())].collect(Collectors::toSet);
}

authorities.stream.filter[e | state.check(e.deleted)].collect(Collectors.toSet) as Set<Authority>

interface IFoo
{
   def List<IBar> getBars()
}

class Foo extends IFoo
{
   List<Bar> barList = New ArrayList()

   override getBars()
   {
      barList.stream.collect(Collectors.toList)
   }
}

Interface IBar
{}

class Bar implements IBar {}