com.alee.utils.map

Class EmptyMapIterator<K,V>

java.lang.Object

com.alee.utils.map.EmptyMapIterator<K,V>

Type Parameters:

K - the type of keys maintained by this map

V - the type of mapped values

All Implemented Interfaces:

MapIterator<K,V>, Iterator<K>

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

MapIterator implementation that has no elements.

Author:

Mikle Garin

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.
static <K,V> EmptyMapIterator<K,V>	instance() Returns EmptyIterator instance.
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

Methods inherited from interface java.util.Iterator

forEachRemaining

Method Detail

instance

public static <K,V> EmptyMapIterator<K,V> instance()

Returns EmptyIterator instance.

Type Parameters:

K - the type of keys maintained by this map

V - the type of mapped values

Returns:

EmptyIterator instance

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 MapIterator<K,V>

Specified by:

hasNext in interface Iterator<K>

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 MapIterator<K,V>

Specified by:

next in interface Iterator<K>

Returns:

the next key in the iteration

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 MapIterator<K,V>

Specified by:

remove in interface Iterator<K>

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