Another groupingReduce overload

[Brian Goetz]

Write it!

While we regrettably cannot publish the Op APIs (to make stream 
pipelines extensible) yet, we will public Collector, and the Collectors 
we've already got are only a few lines of code each.  So you should be 
able to write this collector yourself, and have it play nicely with the 
pre-baked collectors.



On 2/13/2013 6:31 PM, Michael Nascimento wrote:
> Hi guys,
>
> Guava's uniqueIndex methods are pervasive in the code base I am using
> to evaluate lambda:
>
> http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Maps.html#uniqueIndex(java.lang.Iterable,
> com.google.common.base.Function)
>
> A groupingReduce overload like this would be very handy:
>
>      public static <T, K> Collector<T, Map<K,T>>
> groupingReduce(Function<? super T, ? extends K> classifier) {
>          return groupingReduce(classifier, HashMap::new,
> Functions.identity(), throwingMerger());
>      }
>
> Is it possible to have it? Please? :-)
>
> Regards,
> Michael
>