public final class StreamSupport extends Object

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 Stream classes.

Since:
1.8

  • Method Summary

    Creates a new sequential or parallel DoubleStream from a Supplier of Spliterator.OfDouble.

    Creates a new sequential or parallel DoubleStream from a Spliterator.OfDouble.

    Creates a new sequential or parallel IntStream from a Supplier of Spliterator.OfInt.

    Creates a new sequential or parallel IntStream from a Spliterator.OfInt.

    Creates a new sequential or parallel LongStream from a Supplier of Spliterator.OfLong.

    Creates a new sequential or parallel LongStream from a Spliterator.OfLong.

    stream(Supplier<? extends Spliterator<T>> supplier, int characteristics, boolean parallel)

    Creates a new sequential or parallel Stream from a Supplier of Spliterator.

    stream(Spliterator<T> spliterator, boolean parallel)

    Creates a new sequential or parallel Stream from a Spliterator.

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • stream

      public static <T> Stream<T> stream(Spliterator<T> spliterator, boolean parallel)

      Creates a new sequential or parallel Stream from a 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 IMMUTABLE or CONCURRENT, or be late-binding. Otherwise, stream(java.util.function.Supplier, int, boolean) should be used to reduce the scope of potential interference with the source. See Non-Interference for more details.

      Type Parameters:
      T - the type of stream elements
      Parameters:
      spliterator - a Spliterator describing the stream elements
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel Stream

    • stream

      public static <T> Stream<T> stream(Supplier<? extends Spliterator<T>> supplier, int characteristics, boolean parallel)

      Creates a new sequential or parallel Stream from a Supplier of Spliterator.

      The 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 IMMUTABLE or CONCURRENT, or that are late-binding, it is likely more efficient to use stream(java.util.Spliterator, boolean) instead.

      The use of a 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 Non-Interference for more details.

      Type Parameters:
      T - the type of stream elements
      Parameters:
      supplier - a Supplier of a Spliterator
      characteristics - Spliterator characteristics of the supplied Spliterator. The characteristics must be equal to supplier.get().characteristics(), otherwise undefined behavior may occur when terminal operation commences.
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel Stream
      See Also:

    • intStream

      Creates a new sequential or parallel IntStream from a 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 IMMUTABLE or CONCURRENT, or be late-binding. Otherwise, intStream(java.util.function.Supplier, int, boolean) should be used to reduce the scope of potential interference with the source. See Non-Interference for more details.

      Parameters:
      spliterator - a Spliterator.OfInt describing the stream elements
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel IntStream

    • intStream

      Creates a new sequential or parallel IntStream from a Supplier of Spliterator.OfInt.

      The 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 IMMUTABLE or CONCURRENT, or that are late-binding, it is likely more efficient to use intStream(java.util.Spliterator.OfInt, boolean) instead.

      The use of a 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 Non-Interference for more details.

      Parameters:
      supplier - a Supplier of a Spliterator.OfInt
      characteristics - Spliterator characteristics of the supplied Spliterator.OfInt. The characteristics must be equal to supplier.get().characteristics(), otherwise undefined behavior may occur when terminal operation commences.
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel IntStream
      See Also:

    • longStream

      Creates a new sequential or parallel LongStream from a 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 IMMUTABLE or CONCURRENT, or be late-binding. Otherwise, longStream(java.util.function.Supplier, int, boolean) should be used to reduce the scope of potential interference with the source. See Non-Interference for more details.

      Parameters:
      spliterator - a Spliterator.OfLong describing the stream elements
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel LongStream

    • longStream

      Creates a new sequential or parallel LongStream from a Supplier of Spliterator.OfLong.

      The 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 IMMUTABLE or CONCURRENT, or that are late-binding, it is likely more efficient to use longStream(java.util.Spliterator.OfLong, boolean) instead.

      The use of a 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 Non-Interference for more details.

      Parameters:
      supplier - a Supplier of a Spliterator.OfLong
      characteristics - Spliterator characteristics of the supplied Spliterator.OfLong. The characteristics must be equal to supplier.get().characteristics(), otherwise undefined behavior may occur when terminal operation commences.
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel LongStream
      See Also:

    • doubleStream

      Creates a new sequential or parallel DoubleStream from a 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 IMMUTABLE or CONCURRENT, or be late-binding. Otherwise, doubleStream(java.util.function.Supplier, int, boolean) should be used to reduce the scope of potential interference with the source. See Non-Interference for more details.

      Parameters:
      spliterator - A Spliterator.OfDouble describing the stream elements
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel DoubleStream

    • doubleStream

      Creates a new sequential or parallel DoubleStream from a Supplier of Spliterator.OfDouble.

      The 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 IMMUTABLE or CONCURRENT, or that are late-binding, it is likely more efficient to use doubleStream(java.util.Spliterator.OfDouble, boolean) instead.

      The use of a 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 Non-Interference for more details.

      Parameters:
      supplier - A Supplier of a Spliterator.OfDouble
      characteristics - Spliterator characteristics of the supplied Spliterator.OfDouble. The characteristics must be equal to supplier.get().characteristics(), otherwise undefined behavior may occur when terminal operation commences.
      parallel - if true then the returned stream is a parallel stream; if false the returned stream is a sequential stream.
      Returns:
      a new sequential or parallel DoubleStream
      See Also: