Example usage for java.util Spliterator SORTED

Introduction

In this page you can find the example usage for java.util Spliterator SORTED.

Prototype

int SORTED

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Document

Characteristic value signifying that encounter order follows a defined sort order.

Usage

From source file:com.github.steveash.guavate.Guavate.java

/**
 * Creates a stream that combines two other streams, continuing until either stream ends.
 * <p>/*from   ww w  . j  a  v a2  s  . c om*/
 * The combiner function is called once for each pair of objects found in the input streams.
 * @param <A> the type of the first stream
 * @param <B> the type of the second stream
 * @param <R> the type of the resulting stream
 * @param stream1 the first stream
 * @param stream2 the first stream
 * @param zipper the function used to combine the pair of objects
 * @return a stream of pairs, one from each stream
 */
private static <A, B, R> Stream<R> zip(Stream<A> stream1, Stream<B> stream2, BiFunction<A, B, R> zipper) {
    // this is private for now, to see if it is really needed on the API
    // it suffers from generics problems at the call site with common zipper functions
    // as such, it is less useful than it might seem
    Spliterator<A> split1 = stream1.spliterator();
    Spliterator<B> split2 = stream2.spliterator();
    // merged stream lacks some characteristics
    int characteristics = split1.characteristics() & split2.characteristics()
            & ~(Spliterator.DISTINCT | Spliterator.SORTED);
    long size = Math.min(split1.getExactSizeIfKnown(), split2.getExactSizeIfKnown());

    Iterator<A> it1 = Spliterators.iterator(split1);
    Iterator<B> it2 = Spliterators.iterator(split2);
    Iterator<R> it = new Iterator<R>() {
        @Override
        public boolean hasNext() {
            return it1.hasNext() && it2.hasNext();
        }

        @Override
        public R next() {
            return zipper.apply(it1.next(), it2.next());
        }
    };
    Spliterator<R> split = Spliterators.spliterator(it, size, characteristics);
    return StreamSupport.stream(split, false);
}

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