Tabulators -- a catalog

[Remi Forax]

On 12/28/2012 03:23 AM, Brian Goetz wrote:
> Here's a catalog of the currently implemented Tabulators.

[...]

> 3. Partition.  Partitions a stream according to a predicate.  Results 
> always are a two-element array of something.  Five forms:
>
>     // Basic
>     <T> Tabulator<T, Collection<T>[]>
>     partition(Predicate<T> predicate)
>
>     // Explicit factory
>     <T, C extends Collection<T>> Tabulator<T, C[]>
>     partition(Predicate<T> predicate,
>               Supplier<C> rowFactory)
>
>     // Partitioned mutable reduce
>     <T, D> Tabulator<T, D[]>
>     partition(Predicate<T> predicate,
>               MutableReducer<T,D> downstream)
>
>     // Partitioned functional reduce
>     Tabulator<T, T[]>
>     partition(Predicate<T> predicate,
>               T zero,
>               BinaryOperator<T> reducer)
>
>     // Partitioned functional map-reduce
>     Tabulator<T, T[]>
>     partition(Predicate<T> predicate,
>               T zero,
>               Function<T, U> mapper,
>               BinaryOperator<T> reducer)

You can't create an array of T (C, D) safely, so casting an array of 
Object to an array of T is maybe acceptable if you control all the 
access to that array like in collections, but here you export it.

Rémi