org.apache.commons.collections4.iterators

Class UnmodifiableMapIterator<K,V>

java.lang.Object

org.apache.commons.collections4.iterators.UnmodifiableMapIterator<K,V>

All Implemented Interfaces:

java.util.Iterator<K>, MapIterator<K,V>, Unmodifiable

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

Decorates a map iterator such that it cannot be modified.

Attempts to modify it will result in an UnsupportedOperationException.

Since:

3.0

Method Summary

Modifier and Type	Method and Description
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).
static <K,V> MapIterator<K,V>	unmodifiableMapIterator(MapIterator<? extends K,? extends V> iterator) Decorates the specified iterator such that it cannot be modified.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Method Detail

unmodifiableMapIterator

public static <K,V> MapIterator<K,V> unmodifiableMapIterator(MapIterator<? extends K,? extends V> iterator)

Decorates the specified iterator such that it cannot be modified.

Type Parameters:

K - the key type

V - the value type

Parameters:

iterator - the iterator to decorate

Returns:

a new unmodifiable map iterator

Throws:

java.lang.NullPointerException - 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 java.util.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 java.util.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 java.util.Iterator<K>

Specified by:

remove in interface MapIterator<K,V>