org.apache.commons.collections.iterators
Class UnmodifiableMapIterator<K,V>

java.lang.Object
  org.apache.commons.collections.iterators.UnmodifiableMapIterator<K,V>

All Implemented Interfaces:

Iterator<K>, MapIterator<K,V>, Unmodifiable

public final class UnmodifiableMapIterator<K,V>
extends Object
implements MapIterator<K,V>, Unmodifiable

Decorates a map iterator such that it cannot be modified.

Since:

Commons Collections 3.0

Version:

$Revision: 1.1.1.1 $ $Date: 2005/05/23 04:35:04 $

Author:

Matt Hall, John Watkinson, Stephen Colebourne

Method Summary

static <K,V> MapIterator<K,V>	decorate(MapIterator<K,V> iterator) Decorates the specified iterator such that it cannot be modified.
K	getKey() Gets the current key, which is the key returned by the last call to next().
V	getValue() Gets the current value, which is the value associated with the last key returned by next().
boolean	hasNext() Checks to see if there are more entries still to be iterated.
K	next() Gets the next key from the Map.
void	remove() Removes the last returned key from the underlying Map (optional operation).
V	setValue(V value) Sets the value associated with the current key (optional operation).

Methods inherited from class java.lang.Object

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

Method Detail

decorate

public static <K,V> MapIterator<K,V> decorate(MapIterator<K,V> iterator)

Decorates the specified iterator such that it cannot be modified.

Parameters:

iterator - the iterator to decorate

Throws:

IllegalArgumentException - if the iterator is null

hasNext

public boolean hasNext()

Description copied from interface: MapIterator

Checks to see if there are more entries still to be iterated.

Specified by:

hasNext in interface Iterator<K>

Specified by:

hasNext in interface MapIterator<K,V>

Returns:

true if the iterator has more elements

next

public K next()

Description copied from interface: MapIterator

Gets the next key from the Map.

Specified by:

next in interface Iterator<K>

Specified by:

next in interface MapIterator<K,V>

Returns:

the next key in the iteration

getKey

public K getKey()

Description copied from interface: MapIterator

Gets the current key, which is the key returned by the last call to next().

Specified by:

getKey in interface MapIterator<K,V>

Returns:

the current key

getValue

public V getValue()

Description copied from interface: MapIterator

Gets the current value, which is the value associated with the last key returned by next().

Specified by:

getValue in interface MapIterator<K,V>

Returns:

the current value

setValue

public V setValue(V value)

Description copied from interface: MapIterator

Sets the value associated with the current key (optional operation).

Specified by:

setValue in interface MapIterator<K,V>

Parameters:

value - the new value

Returns:

the previous value

remove

public void remove()

Description copied from interface: MapIterator

Removes the last returned key from the underlying Map (optional operation).

This method can be called once per call to next().

Specified by:

remove in interface Iterator<K>

Specified by:

remove in interface MapIterator<K,V>