Collectors update (original) (raw)

Brian Goetz brian.goetz at oracle.com
Tue Feb 5 12:22:02 PST 2013

I concur with Kevin.

On 2/5/2013 3:20 PM, Kevin Bourrillion wrote:

On Tue, Feb 5, 2013 at 11:11 AM, Remi Forax <forax at univ-mlv.fr_ _<mailto:forax at univ-mlv.fr>> wrote:

4. Rejigger Partition to return an array again, with an explicit lambda (which will likely be an array ctor ref) to make the array. Eliminated the silly Partition class.

Please don't do that, it's pure evil. public static Collector<T, Collection[]> partitioningBy(Predicate predicate, IntFunction<Collection[]> arraySupplier) { I've refactored this to make the partition collectors return Map<Boolean, X>. I think returning a boolean -> T (or Boolean -> T) is better because it's conceptually more lightweight than a Map. I expect to see more function instead of a Map returned as result of a method. I'd have to disagree; I expect function objects to be little things I pass /in/, but I think it's more intuitive to expect a proper data structure back out. -- Kevin Bourrillion | Java Librarian | Google, Inc. |kevinb at google.com <mailto:kevinb at google.com>

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