Collector Variants

[Richard Warburton]

Hi,

partitioningBy and groupingBy both have a variant with a  default
downstream collector, eg:

public static <T, K> Collector<T, ?, Map<K, List<T>>>
groupingBy(Function<? super T, ? extends K> classifier)

Is there any reason why there is no such equivalent for mapping?  It would
seem to be a fairly common use case (at least from my Collector usage).
 Especially given that I seem to be using mapping as a downstream collector
for groupingBy or partitioningBy rather than anything else.  In which case
why not have the 'leaf' collection default be the same?

regards,

  Dr. Richard Warburton

  http://insightfullogic.com
  @RichardWarburto <http://twitter.com/richardwarburto>