scala.compat.java8.converterImpl

Class AbstractStepsWithTail<CC,Sub,Semi extends Sub>

java.lang.Object

scala.compat.java8.converterImpl.AbstractStepsWithTail<CC,Sub,Semi>

Direct Known Subclasses:

StepsDoubleWithTail, StepsIntWithTail, StepsLongWithTail, StepsWithTail

public abstract class AbstractStepsWithTail<CC,Sub,Semi extends Sub>
extends java.lang.Object

Abstracts all the generic operations of stepping over a collection with a fast tail operation. Because of how Java 8 streams subdivide their spliterators, we do this by chunking a bit at a time, generating a long chain of chunks. These won't necessarily all be the same size, but if there are enough hopefully it won't matter.

Subclasses MUST decrement maxN when consuming elements, or this will not work!

Constructor Summary

Constructors

Constructor and Description
AbstractStepsWithTail(CC underlying, long maxN)

Method Summary

Modifier and Type	Method and Description
int	characteristics()
long	estimateSize()
boolean	hasNext()
protected long	maxN()
protected abstract boolean	myIsEmpty(CC cc)
protected abstract CC	myTailOf(CC cc)
AbstractStepsWithTail<CC,Sub,Semi>	prepareParallelOperation()
abstract Semi	semiclone(int chunk)
Sub	substep()
protected CC	underlying()

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractStepsWithTail

public AbstractStepsWithTail(CC underlying,
                             long maxN)

Method Detail

characteristics

public int characteristics()

estimateSize

public long estimateSize()

hasNext

public boolean hasNext()

maxN

protected final long maxN()

myIsEmpty

protected abstract boolean myIsEmpty(CC cc)

myTailOf

protected abstract CC myTailOf(CC cc)

prepareParallelOperation

public AbstractStepsWithTail<CC,Sub,Semi> prepareParallelOperation()

semiclone

public abstract Semi semiclone(int chunk)

substep

public Sub substep()

underlying

protected final CC underlying()