Class HeadTailSpliterator<T,U>

java.lang.Object

java.util.Spliterators.AbstractSpliterator<U>

one.util.streamex.HeadTailSpliterator<T,U>

All Implemented Interfaces:

Spliterator<U>, Internals.TailSpliterator<U>

final class HeadTailSpliterator<T,U>
extends Spliterators.AbstractSpliterator<U>
implements Internals.TailSpliterator<U>

Nested Class Summary

Nested classes/interfaces inherited from interface Spliterator

Spliterator.OfDouble, Spliterator.OfInt, Spliterator.OfLong, Spliterator.OfPrimitive<T,T_CONS,T_SPLITR>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) StreamContext	context
private Supplier<? extends Stream<U>>	emptyMapper
private BiFunction<? super T, ? super StreamEx<T>, ? extends Stream<U>>	mapper
private Spliterator<T>	source
private Spliterator<U>	target

Fields inherited from interface Spliterator

CONCURRENT, DISTINCT, IMMUTABLE, NONNULL, ORDERED, SIZED, SORTED, SUBSIZED

Constructor Summary

Constructors

Constructor	Description
HeadTailSpliterator(Spliterator<T> source, BiFunction<? super T, ? super StreamEx<T>, ? extends Stream<U>> mapper, Supplier<? extends Stream<U>> emptyMapper)

Method Summary

Modifier and Type	Method	Description
long	estimateSize()
Spliterator<U>	forEachOrTail(Consumer<? super U> action)	Traverses this spliterator and returns null if traversal is completed or tail spliterator if it must be used for further traversal.
void	forEachRemaining(Consumer<? super U> action)
private boolean	init()
boolean	tryAdvance(Consumer<? super U> action)
Spliterator<U>	tryAdvanceOrTail(Consumer<? super U> action)	Either advances by one element feeding it to consumer and returns this or returns tail spliterator (this spliterator becomes invalid and tail must be used instead) or returns null if traversal finished.

Methods inherited from class Spliterators.AbstractSpliterator

characteristics, trySplit

Methods inherited from class Object

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

Methods inherited from interface Spliterator

characteristics, getComparator, getExactSizeIfKnown, hasCharacteristics, trySplit

Field Details

source

private Spliterator<T> source

mapper

private BiFunction<? super T, ? super StreamEx<T>, ? extends Stream<U>> mapper

emptyMapper

private Supplier<? extends Stream<U>> emptyMapper

target

private Spliterator<U> target

context

StreamContext context

Constructor Details

HeadTailSpliterator

HeadTailSpliterator(Spliterator<T> source,
 BiFunction<? super T, ? super StreamEx<T>, ? extends Stream<U>> mapper,
 Supplier<? extends Stream<U>> emptyMapper)

Method Details

tryAdvance

public boolean tryAdvance(Consumer<? super U> action)

Specified by:

tryAdvance in interface Spliterator<T>

tryAdvanceOrTail

public Spliterator<U> tryAdvanceOrTail(Consumer<? super U> action)

Description copied from interface: Internals.TailSpliterator

Either advances by one element feeding it to consumer and returns this or returns tail spliterator (this spliterator becomes invalid and tail must be used instead) or returns null if traversal finished.

Specified by:

tryAdvanceOrTail in interface Internals.TailSpliterator<T>

Parameters:

action - to feed the next element into

Returns:

tail spliterator, this or null

forEachRemaining

public void forEachRemaining(Consumer<? super U> action)

Specified by:

forEachRemaining in interface Spliterator<T>

forEachOrTail

public Spliterator<U> forEachOrTail(Consumer<? super U> action)

Description copied from interface: Internals.TailSpliterator

Traverses this spliterator and returns null if traversal is completed or tail spliterator if it must be used for further traversal.

Specified by:

forEachOrTail in interface Internals.TailSpliterator<T>

Parameters:

action - to feed the elements into

Returns:

tail spliterator or null (never returns this)

init

private boolean init()

estimateSize

public long estimateSize()

Specified by:

estimateSize in interface Spliterator<T>

Overrides:

estimateSize in class Spliterators.AbstractSpliterator<U>