Edit C:\Program Files\Java\jdk1.8.0_121\java\util\stream\StreamSupport.java

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
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 *
 */
package java.util.stream;

import java.util.Objects;
import java.util.Spliterator;
import java.util.function.Supplier;

/**
 * Low-level utility methods for creating and manipulating streams.
 *
 * This class is mostly for library writers presenting stream views
 * of data structures; most static stream methods intended for end users are in
 * the various {@code Stream} classes.
 *
 * @since 1.8
 */
public final class StreamSupport {

// Suppresses default constructor, ensuring non-instantiability.
    private StreamSupport() {}

/**
 * Creates a new sequential or parallel {@code Stream} from a
 * {@code Spliterator}.
 *
 * The spliterator is only traversed, split, or queried for estimated
 * size after the terminal operation of the stream pipeline commences.
 *
 * It is strongly recommended the spliterator report a characteristic of
 * {@code IMMUTABLE} or {@code CONCURRENT}, or be
 * <a href="../Spliterator.html#binding">late-binding</a>. Otherwise,
 * {@link #stream(java.util.function.Supplier, int, boolean)} should be used
 * to reduce the scope of potential interference with the source. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param <T> the type of stream elements
 * @param spliterator a {@code Spliterator} describing the stream elements
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code Stream}
 */
 public static <T> Stream<T> stream(Spliterator<T> spliterator, boolean parallel) {
 Objects.requireNonNull(spliterator);
 return new ReferencePipeline.Head<>(spliterator,
 StreamOpFlag.fromCharacteristics(spliterator),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code Stream} from a
 * {@code Supplier} of {@code Spliterator}.
 *
 * The {@link Supplier#get()} method will be invoked on the supplier no
 * more than once, and only after the terminal operation of the stream pipeline
 * commences.
 *
 * For spliterators that report a characteristic of {@code IMMUTABLE}
 * or {@code CONCURRENT}, or that are
 * <a href="../Spliterator.html#binding">late-binding</a>, it is likely
 * more efficient to use {@link #stream(java.util.Spliterator, boolean)}
 * instead.
 * The use of a {@code Supplier} in this form provides a level of
 * indirection that reduces the scope of potential interference with the
 * source. Since the supplier is only invoked after the terminal operation
 * commences, any modifications to the source up to the start of the
 * terminal operation are reflected in the stream result. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param <T> the type of stream elements
 * @param supplier a {@code Supplier} of a {@code Spliterator}
 * @param characteristics Spliterator characteristics of the supplied
 * {@code Spliterator}. The characteristics must be equal to
 * {@code supplier.get().characteristics()}, otherwise undefined
 * behavior may occur when terminal operation commences.
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code Stream}
 * @see #stream(java.util.Spliterator, boolean)
 */
 public static <T> Stream<T> stream(Supplier<? extends Spliterator<T>> supplier,
 int characteristics,
 boolean parallel) {
 Objects.requireNonNull(supplier);
 return new ReferencePipeline.Head<>(supplier,
 StreamOpFlag.fromCharacteristics(characteristics),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code IntStream} from a
 * {@code Spliterator.OfInt}.
 *
 * The spliterator is only traversed, split, or queried for estimated size
 * after the terminal operation of the stream pipeline commences.
 *
 * It is strongly recommended the spliterator report a characteristic of
 * {@code IMMUTABLE} or {@code CONCURRENT}, or be
 * <a href="../Spliterator.html#binding">late-binding</a>. Otherwise,
 * {@link #intStream(java.util.function.Supplier, int, boolean)} should be
 * used to reduce the scope of potential interference with the source. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param spliterator a {@code Spliterator.OfInt} describing the stream elements
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code IntStream}
 */
 public static IntStream intStream(Spliterator.OfInt spliterator, boolean parallel) {
 return new IntPipeline.Head<>(spliterator,
 StreamOpFlag.fromCharacteristics(spliterator),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code IntStream} from a
 * {@code Supplier} of {@code Spliterator.OfInt}.
 *
 * The {@link Supplier#get()} method will be invoked on the supplier no
 * more than once, and only after the terminal operation of the stream pipeline
 * commences.
 *
 * For spliterators that report a characteristic of {@code IMMUTABLE}
 * or {@code CONCURRENT}, or that are
 * <a href="../Spliterator.html#binding">late-binding</a>, it is likely
 * more efficient to use {@link #intStream(java.util.Spliterator.OfInt, boolean)}
 * instead.
 * The use of a {@code Supplier} in this form provides a level of
 * indirection that reduces the scope of potential interference with the
 * source. Since the supplier is only invoked after the terminal operation
 * commences, any modifications to the source up to the start of the
 * terminal operation are reflected in the stream result. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param supplier a {@code Supplier} of a {@code Spliterator.OfInt}
 * @param characteristics Spliterator characteristics of the supplied
 * {@code Spliterator.OfInt}. The characteristics must be equal to
 * {@code supplier.get().characteristics()}, otherwise undefined
 * behavior may occur when terminal operation commences.
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code IntStream}
 * @see #intStream(java.util.Spliterator.OfInt, boolean)
 */
 public static IntStream intStream(Supplier<? extends Spliterator.OfInt> supplier,
 int characteristics,
 boolean parallel) {
 return new IntPipeline.Head<>(supplier,
 StreamOpFlag.fromCharacteristics(characteristics),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code LongStream} from a
 * {@code Spliterator.OfLong}.
 *
 * The spliterator is only traversed, split, or queried for estimated
 * size after the terminal operation of the stream pipeline commences.
 *
 * It is strongly recommended the spliterator report a characteristic of
 * {@code IMMUTABLE} or {@code CONCURRENT}, or be
 * <a href="../Spliterator.html#binding">late-binding</a>. Otherwise,
 * {@link #longStream(java.util.function.Supplier, int, boolean)} should be
 * used to reduce the scope of potential interference with the source. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param spliterator a {@code Spliterator.OfLong} describing the stream elements
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code LongStream}
 */
 public static LongStream longStream(Spliterator.OfLong spliterator,
 boolean parallel) {
 return new LongPipeline.Head<>(spliterator,
 StreamOpFlag.fromCharacteristics(spliterator),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code LongStream} from a
 * {@code Supplier} of {@code Spliterator.OfLong}.
 *
 * The {@link Supplier#get()} method will be invoked on the supplier no
 * more than once, and only after the terminal operation of the stream pipeline
 * commences.
 *
 * For spliterators that report a characteristic of {@code IMMUTABLE}
 * or {@code CONCURRENT}, or that are
 * <a href="../Spliterator.html#binding">late-binding</a>, it is likely
 * more efficient to use {@link #longStream(java.util.Spliterator.OfLong, boolean)}
 * instead.
 * The use of a {@code Supplier} in this form provides a level of
 * indirection that reduces the scope of potential interference with the
 * source. Since the supplier is only invoked after the terminal operation
 * commences, any modifications to the source up to the start of the
 * terminal operation are reflected in the stream result. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param supplier a {@code Supplier} of a {@code Spliterator.OfLong}
 * @param characteristics Spliterator characteristics of the supplied
 * {@code Spliterator.OfLong}. The characteristics must be equal to
 * {@code supplier.get().characteristics()}, otherwise undefined
 * behavior may occur when terminal operation commences.
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code LongStream}
 * @see #longStream(java.util.Spliterator.OfLong, boolean)
 */
 public static LongStream longStream(Supplier<? extends Spliterator.OfLong> supplier,
 int characteristics,
 boolean parallel) {
 return new LongPipeline.Head<>(supplier,
 StreamOpFlag.fromCharacteristics(characteristics),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code DoubleStream} from a
 * {@code Spliterator.OfDouble}.
 *
 * The spliterator is only traversed, split, or queried for estimated size
 * after the terminal operation of the stream pipeline commences.
 *
 * It is strongly recommended the spliterator report a characteristic of
 * {@code IMMUTABLE} or {@code CONCURRENT}, or be
 * <a href="../Spliterator.html#binding">late-binding</a>. Otherwise,
 * {@link #doubleStream(java.util.function.Supplier, int, boolean)} should
 * be used to reduce the scope of potential interference with the source. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param spliterator A {@code Spliterator.OfDouble} describing the stream elements
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code DoubleStream}
 */
 public static DoubleStream doubleStream(Spliterator.OfDouble spliterator,
 boolean parallel) {
 return new DoublePipeline.Head<>(spliterator,
 StreamOpFlag.fromCharacteristics(spliterator),
 parallel);
 }

/**
 * Creates a new sequential or parallel {@code DoubleStream} from a
 * {@code Supplier} of {@code Spliterator.OfDouble}.
 *
 * The {@link Supplier#get()} method will be invoked on the supplier no
 * more than once, and only after the terminal operation of the stream pipeline
 * commences.
 *
 * For spliterators that report a characteristic of {@code IMMUTABLE}
 * or {@code CONCURRENT}, or that are
 * <a href="../Spliterator.html#binding">late-binding</a>, it is likely
 * more efficient to use {@link #doubleStream(java.util.Spliterator.OfDouble, boolean)}
 * instead.
 * The use of a {@code Supplier} in this form provides a level of
 * indirection that reduces the scope of potential interference with the
 * source. Since the supplier is only invoked after the terminal operation
 * commences, any modifications to the source up to the start of the
 * terminal operation are reflected in the stream result. See
 * <a href="package-summary.html#NonInterference">Non-Interference</a> for
 * more details.
 *
 * @param supplier A {@code Supplier} of a {@code Spliterator.OfDouble}
 * @param characteristics Spliterator characteristics of the supplied
 * {@code Spliterator.OfDouble}. The characteristics must be equal to
 * {@code supplier.get().characteristics()}, otherwise undefined
 * behavior may occur when terminal operation commences.
 * @param parallel if {@code true} then the returned stream is a parallel
 * stream; if {@code false} the returned stream is a sequential
 * stream.
 * @return a new sequential or parallel {@code DoubleStream}
 * @see #doubleStream(java.util.Spliterator.OfDouble, boolean)
 */
 public static DoubleStream doubleStream(Supplier<? extends Spliterator.OfDouble> supplier,
 int characteristics,
 boolean parallel) {
 return new DoublePipeline.Head<>(supplier,
 StreamOpFlag.fromCharacteristics(characteristics),
 parallel);
 }
}

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