Package org.apache.commons.collections4.iterators

Class UnmodifiableOrderedMapIterator<K,V>

java.lang.Object

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

All Implemented Interfaces:

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

public final class UnmodifiableOrderedMapIterator<K,V>
extends Object
implements OrderedMapIterator<K,V>, Unmodifiable

Decorates an ordered 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	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.
boolean	hasPrevious()	Checks to see if there is a previous entry that can be iterated to.
K	next()	Gets the next key from the Map.
K	previous()	Gets the previous 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> OrderedMapIterator<K,V>	unmodifiableOrderedMapIterator(OrderedMapIterator<K,? extends V> iterator)	Decorates the specified iterator such that it cannot be modified.

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

Method Detail

unmodifiableOrderedMapIterator

public static <K,V> OrderedMapIterator<K,V> unmodifiableOrderedMapIterator(OrderedMapIterator<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 ordered map iterator

Throws:

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 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

hasPrevious

public boolean hasPrevious()

Description copied from interface: OrderedMapIterator

Checks to see if there is a previous entry that can be iterated to.

Specified by:

hasPrevious in interface OrderedIterator<K>

Specified by:

hasPrevious in interface OrderedMapIterator<K,V>

Returns:

true if the iterator has a previous element

previous

public K previous()

Description copied from interface: OrderedMapIterator

Gets the previous key from the Map.

Specified by:

previous in interface OrderedIterator<K>

Specified by:

previous in interface OrderedMapIterator<K,V>

Returns:

the previous 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>