Example usage for java.util Spliterator characteristics

Introduction

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

Prototype

int characteristics();

Source Link

Document

Returns a set of characteristics of this Spliterator and its elements.

Usage

From source file:com.wrmsr.kleist.util.Itertools.java

public static <T> Spliterator<EnumeratedElement<T>> enumerate(Spliterator<T> spliterator) {
    int characteristics = spliterator.characteristics() | Spliterator.NONNULL & ~Spliterator.CONCURRENT;
    return Spliterators.spliterator(enumerate(Spliterators.iterator(spliterator)), spliterator.estimateSize(),
            characteristics);//from   w  w  w.  j a v  a 2  s.  co  m
}

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

/**
 * Creates a stream that combines two other streams, continuing until either stream ends.
 * <p>//from w w  w  .  ja v  a  2 s  . c  o  m
 * 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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From source file:com.github.steveash.guavate.Guavate.java

/**
 * Creates a stream that wraps a stream with the index.
 * <p>/*from  w  ww  . j a va2 s . co  m*/
 * Each input object is decorated with an {@link ObjIntPair}.
 * The {@code int} is the index of the element in the stream.
 * @param <T> the type of the stream
 * @param stream the stream to index
 * @return a stream of pairs, containing the element and index
 */
public static <T> Stream<ObjIntPair<T>> zipWithIndex(Stream<T> stream) {
    Spliterator<T> split1 = stream.spliterator();
    Iterator<T> it1 = Spliterators.iterator(split1);
    Iterator<ObjIntPair<T>> it = new Iterator<ObjIntPair<T>>() {
        int index = 0;

        @Override
        public boolean hasNext() {
            return it1.hasNext();
        }

        @Override
        public ObjIntPair<T> next() {
            return ObjIntPair.of(it1.next(), index++);
        }
    };
    Spliterator<ObjIntPair<T>> split = Spliterators.spliterator(it, split1.getExactSizeIfKnown(),
            split1.characteristics());
    return StreamSupport.stream(split, false);
}

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