org.apache.commons.collections.iterators
Class ListIteratorWrapper<E>

java.lang.Object
  org.apache.commons.collections.iterators.ListIteratorWrapper<E>

All Implemented Interfaces:

Iterator<E>, ListIterator<E>

public class ListIteratorWrapper<E>
extends Object
implements ListIterator<E>

As the wrapped Iterator is traversed, ListIteratorWrapper builds a LinkedList of its values, permitting all required operations of ListIterator.

Since:

Commons Collections 2.1

Version:

$Revision: 1.1.1.1 $ $Date: 2005/05/23 04:34:55 $

Author:

Morgan Delagrange, Matt Hall, John Watkinson, Stephen Colebourne

Constructor Summary

ListIteratorWrapper(Iterator<E> iterator)
Constructs a new ListIteratorWrapper that will wrap the given iterator.

Method Summary

void	add(E o) Throws UnsupportedOperationException.
boolean	hasNext() Returns true if there are more elements in the iterator.
boolean	hasPrevious() Returns true if there are previous elements in the iterator.
E	next() Returns the next element from the iterator.
int	nextIndex() Returns in the index of the next element.
E	previous() Returns the the previous element.
int	previousIndex() Returns the index of the previous element.
void	remove() Throws UnsupportedOperationException.
void	set(E o) Throws UnsupportedOperationException.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListIteratorWrapper

public ListIteratorWrapper(Iterator<E> iterator)

Constructs a new ListIteratorWrapper that will wrap the given iterator.

Parameters:

iterator - the iterator to wrap

Throws:

NullPointerException - if the iterator is null

Method Detail

add

public void add(E o)
         throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

add in interface ListIterator<E>

Parameters:

o - ignored

Throws:

UnsupportedOperationException - always

hasNext

public boolean hasNext()

Returns true if there are more elements in the iterator.

Specified by:

hasNext in interface Iterator<E>

Specified by:

hasNext in interface ListIterator<E>

Returns:

true if there are more elements

hasPrevious

public boolean hasPrevious()

Returns true if there are previous elements in the iterator.

Specified by:

hasPrevious in interface ListIterator<E>

Returns:

true if there are previous elements

next

public E next()
       throws NoSuchElementException

Returns the next element from the iterator.

Specified by:

next in interface Iterator<E>

Specified by:

next in interface ListIterator<E>

Returns:

the next element from the iterator

Throws:

NoSuchElementException - if there are no more elements

nextIndex

public int nextIndex()

Returns in the index of the next element.

Specified by:

nextIndex in interface ListIterator<E>

Returns:

the index of the next element

previous

public E previous()
           throws NoSuchElementException

Returns the the previous element.

Specified by:

previous in interface ListIterator<E>

Returns:

the previous element

Throws:

NoSuchElementException - if there are no previous elements

previousIndex

public int previousIndex()

Returns the index of the previous element.

Specified by:

previousIndex in interface ListIterator<E>

Returns:

the index of the previous element

remove

public void remove()
            throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

remove in interface Iterator<E>

Specified by:

remove in interface ListIterator<E>

Throws:

UnsupportedOperationException - always

set

public void set(E o)
         throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

set in interface ListIterator<E>

Parameters:

o - ignored

Throws:

UnsupportedOperationException - always