public abstract static class Spliterators.AbstractDoubleSpliterator extends Object implements Spliterator.OfDouble
Spliterator.OfDouble that implements
trySplit to permit limited parallelism.
To implement a spliterator an extending class need only
implement Spliterator.OfDouble.tryAdvance(java.util.function.DoubleConsumer)
tryAdvance}. The extending class should override
Spliterator.OfDouble.forEachRemaining(java.util.function.DoubleConsumer) forEach} if
it can provide a more performant implementation.
An alternative to using this class, that also permits limited
parallelism, is to create a spliterator from an iterator
(see Spliterators.spliterator(java.util.PrimitiveIterator.OfDouble, long, int).
Depending on the circumstances using an iterator may be easier or more
convenient than extending this class. For example, if there is already an
iterator available to use then there is no need to extend this class.
Spliterators.spliterator(java.util.PrimitiveIterator.OfDouble, long, int)Spliterator.OfDouble, Spliterator.OfInt, Spliterator.OfLong, Spliterator.OfPrimitive<T,T_CONS,T_SPLITR extends Spliterator.OfPrimitive<T,T_CONS,T_SPLITR>>CONCURRENT, DISTINCT, IMMUTABLE, NONNULL, ORDERED, SIZED, SORTED, SUBSIZED| Modifier | Constructor and Description |
|---|---|
protected |
AbstractDoubleSpliterator(long est,
int additionalCharacteristics)
Creates a spliterator reporting the given estimated size and
characteristics.
|
| Modifier and Type | Method and Description |
|---|---|
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
Spliterator.forEachRemaining(java.util.function.Consumer<? super T>) traversal, or returns Long.MAX_VALUE if infinite, unknown, or too expensive to compute. |
Spliterator.OfDouble |
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.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitforEachRemaining, forEachRemaining, tryAdvance, tryAdvancegetComparator, getExactSizeIfKnown, hasCharacteristicsprotected AbstractDoubleSpliterator(long est,
int additionalCharacteristics)
est - the estimated size of this spliterator if known, otherwise
Long.MAX_VALUE.additionalCharacteristics - properties of this spliterator's
source or elements. If SIZED is reported then this
spliterator will additionally report SUBSIZED.public Spliterator.OfDouble trySplit()
If this Spliterator is Spliterator.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:
estimateSize() before splitting,
must, after splitting, be greater than or equal to estimateSize()
for this and the returned Spliterator; andSUBSIZED, 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.
trySplit in interface Spliterator<Double>trySplit in interface Spliterator.OfDoubletrySplit in interface Spliterator.OfPrimitive<Double,DoubleConsumer,Spliterator.OfDouble>Spliterator covering some portion of the
elements, or null if this spliterator cannot be splitpublic long estimateSize()
Spliterator.forEachRemaining(java.util.function.Consumer<? super T>) traversal, or returns Long.MAX_VALUE if infinite, unknown, or too expensive to compute.
If this Spliterator is Spliterator.SIZED and has not yet been partially
traversed or split, or this Spliterator is Spliterator.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 Spliterator.trySplit().
estimateSize in interface Spliterator<Double>Long.MAX_VALUE if infinite,
unknown, or too expensive to compute.public int characteristics()
Spliterator.ORDERED, Spliterator.DISTINCT, Spliterator.SORTED, Spliterator.SIZED,
Spliterator.NONNULL, Spliterator.IMMUTABLE, Spliterator.CONCURRENT,
Spliterator.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.
characteristics in interface Spliterator<Double> Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2019, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.