Custom stream extensions

[Arul Dhesiaseelan]

Thanks Brian. This approach looks awesome. I hope it sees light some day.


On Sun, Feb 3, 2013 at 12:18 PM, Brian Goetz <brian.goetz at oracle.com> wrote:

> Right.  During initial development, all these classes were public, mostly
> for convenience of testing.
>
> There always has been an extensibility strategy in place, but it will
> sadly not be ready for 8.  Eventually, we will make public the XxxOp
> classes, which will enable you to write your own ops, and thread them into
> pipeline with the pipeline() method:
>
>   stream.filter(...)
>         .pipeline(myCustomOp(args))
>         .map(...)
>         ...
>
> The built-in ops all use this API, so we have been eating our own dogfood.
>  However, it is clear that this API is not yet ready to be carved in stone.
>  So the responsible thing to do is to keep it private for now, until it is
> ready, at which point this extensibility mechanism will be available to
> everyone.
>
>
>
>
> On 2/3/2013 4:56 PM, Arul Dhesiaseelan wrote:
>
>> I was able to add extensions to my custom list implementation in earlier
>> builds.
>>
>>    public MyStream<E> stream() {
>>      return new MyReferencePipeline<>(() -> Arrays.spliterator((E[])
>> this.toArray(), 0, this.size()), StreamOpFlag.IS_SIZED |
>> StreamOpFlag.IS_ORDERED);
>>    }
>>
>>
>> Now that, ReferencePipeline is made package local, this approach is no
>> longer possible.
>>
>> It was extremely useful to extend some of these core classes outside the
>> package and toss in extensions with minimal coding. I assume this is not
>> encouraged?
>>
>> Thanks,
>> Arul
>>
>>