Tabulators -- a catalog

[Brian Goetz]

So the thing to do here is return Object[] instead of T[] / D[].  Sad, 
but not terrible.  Not important enough to have the user pass in a 
factory.  For want of a Pair...

On 12/28/2012 9:39 AM, Remi Forax wrote:
> 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
>