Package com.tangosol.util.stream

Interface RemoteLongStream

All Superinterfaces:
AutoCloseable, BaseRemoteStream<Long,LongStream>, BaseStream<Long,LongStream>, LongStream
public interface RemoteLongStream extends LongStream, BaseRemoteStream<Long,LongStream>
A sequence of primitive long-valued elements supporting sequential and parallel aggregate operations. This is the long primitive specialization of RemoteStream.

The following example illustrates an aggregate operation using RemoteStream and RemoteLongStream, computing the sum of the weights of the red widgets: 


     long sum = widgets.stream()
                       .filter(w -> w.getColor() == RED)
                       .mapToLong(w -> w.getWeight())
                       .sum();

This interface is an extension of java.util.stream.LongStream that captures lambdas used as method arguments as serializable lambdas.

Since:
12.2.1
Author:
as 2014.09.11
See Also:

  • Method Details

    • filter

      RemoteLongStream filter(LongPredicate predicate)
      Returns a stream consisting of the elements of this stream that match the given predicate.

      This is an intermediate operation.

      Specified by:
      filter in interface LongStream
      Parameters:
      predicate - a non-interfering, stateless predicate to apply to each element to determine if it should be included
      Returns:
      the new stream

    • filter

      default RemoteLongStream filter(Remote.LongPredicate predicate)
      Returns a stream consisting of the elements of this stream that match the given predicate.

      This is an intermediate operation.

      Parameters:
      predicate - a non-interfering, stateless predicate to apply to each element to determine if it should be included
      Returns:
      the new stream

    • map

      RemoteLongStream map(LongUnaryOperator mapper)
      Returns a stream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Specified by:
      map in interface LongStream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • map

      default RemoteLongStream map(Remote.LongUnaryOperator mapper)
      Returns a stream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToObj

      <U> RemoteStream<U> mapToObj(LongFunction<? extends U> mapper)
      Returns an object-valued Stream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Specified by:
      mapToObj in interface LongStream
      Type Parameters:
      U - the element type of the new stream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToObj

      default <U> RemoteStream<U> mapToObj(Remote.LongFunction<? extends U> mapper)
      Returns an object-valued Stream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Type Parameters:
      U - the element type of the new stream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToInt

      RemoteIntStream mapToInt(LongToIntFunction mapper)
      Returns an IntStream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Specified by:
      mapToInt in interface LongStream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToInt

      default RemoteIntStream mapToInt(Remote.LongToIntFunction mapper)
      Returns an IntStream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToDouble

      RemoteDoubleStream mapToDouble(LongToDoubleFunction mapper)
      Returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Specified by:
      mapToDouble in interface LongStream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • mapToDouble

      default RemoteDoubleStream mapToDouble(Remote.LongToDoubleFunction mapper)
      Returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.

      This is an intermediate operation.

      Parameters:
      mapper - a non-interfering, stateless function to apply to each element
      Returns:
      the new stream

    • flatMap

      RemoteLongStream flatMap(LongFunction<? extends LongStream> mapper)
      Returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each element. Each mapped stream is closed after its contents have been placed into this stream. (If a mapped stream is null an empty stream is used, instead.)

      This is an intermediate operation.

      Specified by:
      flatMap in interface LongStream
      Parameters:
      mapper - a non-interfering, stateless function to apply to each element which produces a LongStream of new values
      Returns:
      the new stream
      See Also:

    • flatMap

      default RemoteLongStream flatMap(Remote.LongFunction<? extends LongStream> mapper)
      Returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each element. Each mapped stream is closed after its contents have been placed into this stream. (If a mapped stream is null an empty stream is used, instead.)

      This is an intermediate operation.

      Parameters:
      mapper - a non-interfering, stateless function to apply to each element which produces a LongStream of new values
      Returns:
      the new stream
      See Also:

    • peek

      RemoteLongStream peek(LongConsumer action)
      Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.

      This is an intermediate operation.

      For parallel stream pipelines, the action may be called at whatever time and in whatever thread the element is made available by the upstream operation. If the action modifies shared state, it is responsible for providing the required synchronization.

      Specified by:
      peek in interface LongStream
      Parameters:
      action - a non-interfering action to perform on the elements as they are consumed from the stream
      Returns:
      the new stream

    • peek

      default RemoteLongStream peek(Remote.LongConsumer action)
      Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.

      This is an intermediate operation.

      For parallel stream pipelines, the action may be called at whatever time and in whatever thread the element is made available by the upstream operation. If the action modifies shared state, it is responsible for providing the required synchronization.

      Parameters:
      action - a non-interfering action to perform on the elements as they are consumed from the stream
      Returns:
      the new stream

    • distinct

      LongStream distinct()
      Returns a stream consisting of the distinct elements of this stream.

      This is a stateful intermediate operation.

      Specified by:
      distinct in interface LongStream
      Returns:
      the new stream

    • sorted

      LongStream sorted()
      Returns a stream consisting of the elements of this stream in sorted order.

      This is a stateful intermediate operation.

      Specified by:
      sorted in interface LongStream
      Returns:
      the new stream

    • limit

      LongStream limit(long maxSize)
      Returns a stream consisting of the elements of this stream, truncated to be no longer than maxSize in length.

      This is a short-circuiting stateful intermediate operation.

      Specified by:
      limit in interface LongStream
      Parameters:
      maxSize - the number of elements the stream should be limited to
      Returns:
      the new stream
      Throws:
      IllegalArgumentException - if maxSize is negative

    • skip

      LongStream skip(long n)
      Returns a stream consisting of the remaining elements of this stream after discarding the first n elements of the stream. If this stream contains fewer than n elements then an empty stream will be returned.

      This is a stateful intermediate operation.

      Specified by:
      skip in interface LongStream
      Parameters:
      n - the number of leading elements to skip
      Returns:
      the new stream
      Throws:
      IllegalArgumentException - if n is negative

    • forEach

      void forEach(LongConsumer action)
      Performs an action for each element of this stream.

      This is a terminal operation.

      For parallel stream pipelines, this operation does not guarantee to respect the encounter order of the stream, as doing so would sacrifice the benefit of parallelism. For any given element, the action may be performed at whatever time and in whatever thread the library chooses. If the action accesses shared state, it is responsible for providing the required synchronization.

      Specified by:
      forEach in interface LongStream
      Parameters:
      action - a non-interfering action to perform on the elements

    • forEachOrdered

      void forEachOrdered(LongConsumer action)
      Performs an action for each element of this stream, guaranteeing that each element is processed in encounter order for streams that have a defined encounter order.

      This is a terminal operation.

      Specified by:
      forEachOrdered in interface LongStream
      Parameters:
      action - a non-interfering action to perform on the elements
      See Also:

    • toArray

      long[] toArray()
      Returns an array containing the elements of this stream.

      This is a terminal operation.

      Specified by:
      toArray in interface LongStream
      Returns:
      an array containing the elements of this stream

    • reduce

      long reduce(long identity, LongBinaryOperator op)
      Performs a reduction on the elements of this stream, using the provided identity value and an associative accumulation function, and returns the reduced value. This is equivalent to: 
      
     long result = identity;
     for (long element : this stream)
         result = accumulator.applyAsLong(result, element)
     return result;
      but is not constrained to execute sequentially.

      The identity value must be an identity for the accumulator function. This means that for all x, accumulator.apply(identity, x) is equal to x. The accumulator function must be an associative function.

      This is a terminal operation.

      Specified by:
      reduce in interface LongStream
      Parameters:
      identity - the identity value for the accumulating function
      op - an associative, non-interfering, stateless function for combining two values
      Returns:
      the result of the reduction
      See Also:

    • reduce

      default long reduce(long identity, Remote.LongBinaryOperator op)
      Performs a reduction on the elements of this stream, using the provided identity value and an associative accumulation function, and returns the reduced value. This is equivalent to: 
      
     long result = identity;
     for (long element : this stream)
         result = accumulator.applyAsLong(result, element)
     return result;
      but is not constrained to execute sequentially.

      The identity value must be an identity for the accumulator function. This means that for all x, accumulator.apply(identity, x) is equal to x. The accumulator function must be an associative function.

      This is a terminal operation.

      Parameters:
      identity - the identity value for the accumulating function
      op - an associative, non-interfering, stateless function for combining two values
      Returns:
      the result of the reduction
      See Also:

    • reduce

      OptionalLong reduce(LongBinaryOperator op)
      Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an OptionalLong describing the reduced value, if any. This is equivalent to: 
      
     boolean foundAny = false;
     long result = null;
     for (long element : this stream) {
         if (!foundAny) {
             foundAny = true;
             result = element;
         }
         else
             result = accumulator.applyAsLong(result, element);
     }
     return foundAny ? OptionalLong.of(result) : OptionalLong.empty();
      but is not constrained to execute sequentially.

      The accumulator function must be an associative function.

      This is a terminal operation.

      Specified by:
      reduce in interface LongStream
      Parameters:
      op - an associative, non-interfering, stateless function for combining two values
      Returns:
      the result of the reduction
      See Also:

    • reduce

      default OptionalLong reduce(Remote.LongBinaryOperator op)
      Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an OptionalLong describing the reduced value, if any. This is equivalent to: 
      
     boolean foundAny = false;
     long result = null;
     for (long element : this stream) {
         if (!foundAny) {
             foundAny = true;
             result = element;
         }
         else
             result = accumulator.applyAsLong(result, element);
     }
     return foundAny ? OptionalLong.of(result) : OptionalLong.empty();
      but is not constrained to execute sequentially.

      The accumulator function must be an associative function.

      This is a terminal operation.

      Parameters:
      op - an associative, non-interfering, stateless function for combining two values
      Returns:
      the result of the reduction
      See Also:

    • collect

      <R> R collect(Supplier<R> supplier, ObjLongConsumer<R> accumulator, BiConsumer<R,R> combiner)
      Performs a mutable reduction operation on the elements of this stream. A mutable reduction is one in which the reduced value is a mutable result container, such as an ArrayList, and elements are incorporated by updating the state of the result rather than by replacing the result. This produces a result equivalent to: 
      
     R result = supplier.get();
     for (long element : this stream)
         accumulator.accept(result, element);
     return result;

      Like reduce(long, LongBinaryOperator), collect operations can be parallelized without requiring additional synchronization.

      This is a terminal operation.

      Specified by:
      collect in interface LongStream
      Type Parameters:
      R - type of the result
      Parameters:
      supplier - a function that creates a new result container. For a parallel execution, this function may be called multiple times and must return a fresh value each time.
      accumulator - an associative, non-interfering, stateless function for incorporating an additional element into a result
      combiner - an associative, non-interfering, stateless function for combining two values, which must be compatible with the accumulator function
      Returns:
      the result of the reduction
      See Also:

    • collect

      default <R> R collect(Remote.Supplier<R> supplier, Remote.ObjLongConsumer<R> accumulator, Remote.BiConsumer<R,R> combiner)
      Performs a mutable reduction operation on the elements of this stream. A mutable reduction is one in which the reduced value is a mutable result container, such as an ArrayList, and elements are incorporated by updating the state of the result rather than by replacing the result. This produces a result equivalent to: 
      
     R result = supplier.get();
     for (long element : this stream)
         accumulator.accept(result, element);
     return result;

      Like reduce(long, LongBinaryOperator), collect operations can be parallelized without requiring additional synchronization.

      This is a terminal operation.

      Type Parameters:
      R - type of the result
      Parameters:
      supplier - a function that creates a new result container. For a parallel execution, this function may be called multiple times and must return a fresh value each time.
      accumulator - an associative, non-interfering, stateless function for incorporating an additional element into a result
      combiner - an associative, non-interfering, stateless function for combining two values, which must be compatible with the accumulator function
      Returns:
      the result of the reduction
      See Also:

    • sum

      long sum()
      Returns the sum of elements in this stream. This is a special case of a reduction and is equivalent to: 
      
     return reduce(0, Long::sum);

      This is a terminal operation.

      Specified by:
      sum in interface LongStream
      Returns:
      the sum of elements in this stream

    • min

      OptionalLong min()
      Returns an OptionalLong describing the minimum element of this stream, or an empty optional if this stream is empty. This is a special case of a reduction and is equivalent to: 
      
     return reduce(Long::min);

      This is a terminal operation.

      Specified by:
      min in interface LongStream
      Returns:
      an OptionalLong containing the minimum element of this stream, or an empty OptionalLong if the stream is empty

    • max

      OptionalLong max()
      Returns an OptionalLong describing the maximum element of this stream, or an empty optional if this stream is empty. This is a special case of a reduction and is equivalent to: 
      
     return reduce(Long::max);

      This is a terminal operation.

      Specified by:
      max in interface LongStream
      Returns:
      an OptionalLong containing the maximum element of this stream, or an empty OptionalLong if the stream is empty

    • count

      long count()
      Returns the count of elements in this stream. This is a special case of a reduction and is equivalent to: 
      
     return map(e -> 1L).sum();

      This is a terminal operation.

      Specified by:
      count in interface LongStream
      Returns:
      the count of elements in this stream

    • average

      OptionalDouble average()
      Returns an OptionalDouble describing the arithmetic mean of elements of this stream, or an empty optional if this stream is empty. This is a special case of a reduction.

      This is a terminal operation.

      Specified by:
      average in interface LongStream
      Returns:
      an OptionalDouble containing the average element of this stream, or an empty optional if the stream is empty

    • summaryStatistics

      LongSummaryStatistics summaryStatistics()
      Returns a LongSummaryStatistics describing various summary data about the elements of this stream. This is a special case of a reduction.

      This is a terminal operation.

      Specified by:
      summaryStatistics in interface LongStream
      Returns:
      a LongSummaryStatistics describing various summary data about the elements of this stream

    • anyMatch

      boolean anyMatch(LongPredicate predicate)
      Returns whether any elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then false is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Specified by:
      anyMatch in interface LongStream
      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if any elements of the stream match the provided predicate, otherwise false

    • anyMatch

      default boolean anyMatch(Remote.LongPredicate predicate)
      Returns whether any elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then false is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if any elements of the stream match the provided predicate, otherwise false

    • allMatch

      boolean allMatch(LongPredicate predicate)
      Returns whether all elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then true is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Specified by:
      allMatch in interface LongStream
      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if either all elements of the stream match the provided predicate or the stream is empty, otherwise false

    • allMatch

      default boolean allMatch(Remote.LongPredicate predicate)
      Returns whether all elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then true is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if either all elements of the stream match the provided predicate or the stream is empty, otherwise false

    • noneMatch

      boolean noneMatch(LongPredicate predicate)
      Returns whether no elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then true is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Specified by:
      noneMatch in interface LongStream
      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if either no elements of the stream match the provided predicate or the stream is empty, otherwise false

    • noneMatch

      default boolean noneMatch(Remote.LongPredicate predicate)
      Returns whether no elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then true is returned and the predicate is not evaluated.

      This is a short-circuiting terminal operation.

      Parameters:
      predicate - a non-interfering, stateless predicate to apply to elements of this stream
      Returns:
      true if either no elements of the stream match the provided predicate or the stream is empty, otherwise false

    • findFirst

      OptionalLong findFirst()
      Returns an OptionalLong describing the first element of this stream, or an empty OptionalLong if the stream is empty. If the stream has no encounter order, then any element may be returned.

      This is a short-circuiting terminal operation.

      Specified by:
      findFirst in interface LongStream
      Returns:
      an OptionalLong describing the first element of this stream, or an empty OptionalLong if the stream is empty

    • findAny

      OptionalLong findAny()
      Returns an OptionalLong describing some element of the stream, or an empty OptionalLong if the stream is empty.

      This is a short-circuiting terminal operation.

      The behavior of this operation is explicitly nondeterministic; it is free to select any element in the stream. This is to allow for maximal performance in parallel operations; the cost is that multiple invocations on the same source may not return the same result. (If a stable result is desired, use findFirst() instead.)

      Specified by:
      findAny in interface LongStream
      Returns:
      an OptionalLong describing some element of this stream, or an empty OptionalLong if the stream is empty
      See Also:

    • asDoubleStream

      RemoteDoubleStream asDoubleStream()
      Returns a DoubleStream consisting of the elements of this stream, converted to double.

      This is an intermediate operation.

      Specified by:
      asDoubleStream in interface LongStream
      Returns:
      a DoubleStream consisting of the elements of this stream, converted to double

    • boxed

      RemoteStream<Long> boxed()
      Returns a Stream consisting of the elements of this stream, each boxed to a Long.

      This is an intermediate operation.

      Specified by:
      boxed in interface LongStream
      Returns:
      a Stream consistent of the elements of this stream, each boxed to Long

    • sequential

      RemoteLongStream sequential()
      Specified by:
      sequential in interface BaseStream<Long,LongStream>
      Specified by:
      sequential in interface LongStream

    • parallel

      RemoteLongStream parallel()
      Specified by:
      parallel in interface BaseStream<Long,LongStream>
      Specified by:
      parallel in interface LongStream

    • iterator

      PrimitiveIterator.OfLong iterator()
      Specified by:
      iterator in interface BaseStream<Long,LongStream>
      Specified by:
      iterator in interface LongStream

    • spliterator

      Spliterator.OfLong spliterator()
      Specified by:
      spliterator in interface BaseStream<Long,LongStream>
      Specified by:
      spliterator in interface LongStream