org.archive.util.iterator

Class LookaheadIterator<T>

java.lang.Object

org.archive.util.iterator.LookaheadIterator<T>

All Implemented Interfaces:

java.util.Iterator<T>

Direct Known Subclasses:

LineReadingIterator, TransformingIteratorWrapper

public abstract class LookaheadIterator<T>
extends java.lang.Object
implements java.util.Iterator<T>

Superclass for Iterators which must probe ahead to know if a 'next' exists, and thus have a cached next between a call to hasNext() and next().

Author:

gojomo

Field Summary

Fields

Modifier and Type	Field and Description
protected T	next

Constructor Summary

Constructors

Constructor and Description
LookaheadIterator()

Method Summary

Modifier and Type	Method and Description
boolean	hasNext() Test whether any items remain; loads next item into holding 'next' field.
protected abstract boolean	lookahead() Caches the next item if available.
T	next() Return the next item.
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

next

protected T next

Constructor Detail

LookaheadIterator

public LookaheadIterator()

Method Detail

hasNext

public boolean hasNext()

Test whether any items remain; loads next item into holding 'next' field.

Specified by:

hasNext in interface java.util.Iterator<T>

See Also:

Iterator.hasNext()

lookahead

protected abstract boolean lookahead()

Caches the next item if available.

Returns:

true if there was a next item to cache, false otherwise

next

public T next()

Return the next item.

Specified by:

next in interface java.util.Iterator<T>

See Also:

Iterator.next()

remove

public void remove()

Specified by:

remove in interface java.util.Iterator<T>