org.mmbase.util

Class BijectiveMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.mmbase.util.BijectiveMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>

public class BijectiveMap<K,V>
extends AbstractMap<K,V>
implements Serializable

A map representing a 1-1 bijective relation between 2 sets of values. So, this map can be turned around (getInverse()). resulting another BijectiveMap, but with keys an values switched.

Since:

MMBase-1.9.1

Version:

$Id$

Author:

Michiel Meeuwissen

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
BijectiveMap()

Method Summary

Modifier and Type	Method and Description
Set<Map.Entry<K,V>>	entrySet()
BijectiveMap<V,K>	getInverse() Returns view on this map where the keys and values have switched their function.
K	inverseGet(V value) Gets a key by value.
V	put(K key, V value)

Methods inherited from class java.util.AbstractMap

clear, clone, containsKey, containsValue, equals, get, hashCode, isEmpty, keySet, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

BijectiveMap

public BijectiveMap()

Method Detail

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

inverseGet

public K inverseGet(V value)

Gets a key by value. That this is possible, is the essence of this class.

getInverse

public BijectiveMap<V,K> getInverse()

Returns view on this map where the keys and values have switched their function.