Spliterators.AbstractSpliterator

public static abstract class Spliterators.AbstractSpliterator
extends Object implements Spliterator<T>

java.lang.Object
↳	java.util.Spliterators.AbstractSpliterator<T>

An abstract Spliterator that implements trySplit to permit limited parallelism.

An extending class need only implement tryAdvance. The extending class should override forEachRemaining if it can provide a more performant implementation.

See also:

Spliterators.spliterator(Iterator, long, int)

Summary

Inherited constants

From interface java.util.Spliterator

`int`	`CONCURRENT` Characteristic value signifying that the element source may be safely concurrently modified (allowing additions, replacements, and/or removals) by multiple threads without external synchronization.
`int`	`DISTINCT` Characteristic value signifying that, for each pair of encountered elements `x, y`, `!x.equals(y)`.
`int`	`IMMUTABLE` Characteristic value signifying that the element source cannot be structurally modified; that is, elements cannot be added, replaced, or removed, so such changes cannot occur during traversal.
`int`	`NONNULL` Characteristic value signifying that the source guarantees that encountered elements will not be `null`.
`int`	`ORDERED` Characteristic value signifying that an encounter order is defined for elements.
`int`	`SIZED` Characteristic value signifying that the value returned from `estimateSize()` prior to traversal or splitting represents a finite size that, in the absence of structural source modification, represents an exact count of the number of elements that would be encountered by a complete traversal.
`int`	`SORTED` Characteristic value signifying that encounter order follows a defined sort order.
`int`	`SUBSIZED` Characteristic value signifying that all Spliterators resulting from `trySplit()` will be both `SIZED` and `SUBSIZED`.

Protected constructors
`AbstractSpliterator(long est, int additionalCharacteristics)` Creates a spliterator reporting the given estimated size and additionalCharacteristics.

Public methods
`int`	`characteristics()` Returns a set of characteristics of this Spliterator and its elements.
`long`	`estimateSize()` Returns an estimate of the number of elements that would be encountered by a `forEachRemaining(Consumer)` traversal, or returns `Long.MAX_VALUE` if infinite, unknown, or too expensive to compute.
`Spliterator<T>`	`trySplit()` If this spliterator can be partitioned, returns a Spliterator covering elements, that will, upon return from this method, not be covered by this Spliterator. This implementation permits limited parallelism.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface


        
          java.util.Spliterator

`abstract int`	`characteristics()` Returns a set of characteristics of this Spliterator and its elements.
`abstract long`	`estimateSize()` Returns an estimate of the number of elements that would be encountered by a `forEachRemaining(Consumer)` traversal, or returns `Long.MAX_VALUE` if infinite, unknown, or too expensive to compute.
`default void`	`forEachRemaining(Consumer<? super T> action)` Performs the given action for each remaining element, sequentially in the current thread, until all elements have been processed or the action throws an exception.
`default Comparator<? super T>`	`getComparator()` If this Spliterator's source is `SORTED` by a `Comparator`, returns that `Comparator`.
`default long`	`getExactSizeIfKnown()` Convenience method that returns `estimateSize()` if this Spliterator is `SIZED`, else `-1`.
`default boolean`	`hasCharacteristics(int characteristics)` Returns `true` if this Spliterator's `characteristics()` contain all of the given characteristics.
`abstract boolean`	`tryAdvance(Consumer<? super T> action)` If a remaining element exists, performs the given action on it, returning `true`; else returns `false`.
`abstract Spliterator<T>`	`trySplit()` If this spliterator can be partitioned, returns a Spliterator covering elements, that will, upon return from this method, not be covered by this Spliterator.

Protected constructors

AbstractSpliterator

Added in API level 24

protected AbstractSpliterator (long est, 
                int additionalCharacteristics)

Creates a spliterator reporting the given estimated size and additionalCharacteristics.

Parameters
`est`	`long`: the estimated size of this spliterator if known, otherwise `Long.MAX_VALUE`.
`additionalCharacteristics`	`int`: properties of this spliterator's source or elements. If `SIZED` is reported then this spliterator will additionally report `SUBSIZED`.

Public methods

characteristics

Added in API level 24

public int characteristics ()

Returns a set of characteristics of this Spliterator and its elements. The result is represented as ORed values from ORDERED, DISTINCT, SORTED, SIZED, NONNULL, IMMUTABLE, CONCURRENT, SUBSIZED. Repeated calls to characteristics() on a given spliterator, prior to or in-between calls to trySplit, should always return the same result.

If a Spliterator reports an inconsistent set of characteristics (either those returned from a single invocation or across multiple invocations), no guarantees can be made about any computation using this Spliterator.

Implementation Requirements:

This implementation returns the characteristics as reported when created.

Returns
`int`	a representation of characteristics

estimateSize

Added in API level 24

public long estimateSize ()

Returns an estimate of the number of elements that would be encountered by a forEachRemaining(Consumer) traversal, or returns Long.MAX_VALUE if infinite, unknown, or too expensive to compute.

If this Spliterator is SIZED and has not yet been partially traversed or split, or this Spliterator is SUBSIZED and has not yet been partially traversed, this estimate must be an accurate count of elements that would be encountered by a complete traversal. Otherwise, this estimate may be arbitrarily inaccurate, but must decrease as specified across invocations of trySplit().

Implementation Requirements:

This implementation returns the estimated size as reported when created and, if the estimate size is known, decreases in size when split.

Returns
`long`	the estimated size, or `Long.MAX_VALUE` if infinite, unknown, or too expensive to compute.

trySplit

Added in API level 24

public Spliterator<T> trySplit ()

If this spliterator can be partitioned, returns a Spliterator covering elements, that will, upon return from this method, not be covered by this Spliterator.

If this Spliterator is ORDERED, the returned Spliterator must cover a strict prefix of the elements.

Unless this Spliterator covers an infinite number of elements, repeated calls to trySplit() must eventually return null. Upon non-null return:

the value reported for estimateSize() before splitting, must, after splitting, be greater than or equal to estimateSize() for this and the returned Spliterator; and
if this Spliterator is SUBSIZED, then estimateSize() for this spliterator before splitting must be equal to the sum of estimateSize() for this and the returned Spliterator after splitting.

This method may return null for any reason, including emptiness, inability to split after traversal has commenced, data structure constraints, and efficiency considerations. This implementation permits limited parallelism.

Returns
`Spliterator<T>`	a `Spliterator` covering some portion of the elements, or `null` if this spliterator cannot be split