org.apache.commons.collections4.bidimap

Class DualHashBidiMap<K,V>

java.lang.Object

org.apache.commons.collections4.bidimap.AbstractDualBidiMap<K,V>

org.apache.commons.collections4.bidimap.DualHashBidiMap<K,V>

Type Parameters:

K - the type of the keys in the map

V - the type of the values in the map

All Implemented Interfaces:

java.io.Serializable, java.util.Map<K,V>, BidiMap<K,V>, Get<K,V>, IterableGet<K,V>, IterableMap<K,V>, Put<K,V>

public class DualHashBidiMap<K,V>
extends AbstractDualBidiMap<K,V>
implements java.io.Serializable

Implementation of BidiMap that uses two HashMap instances.

Two HashMap instances are used in this class. This provides fast lookups at the expense of storing two sets of map entries. Commons Collections would welcome the addition of a direct hash-based implementation of the BidiMap interface.

NOTE: From Commons Collections 3.1, all subclasses will use HashMap and the flawed createMap method is ignored.

Since:

3.0

See Also:

Serialized Form

Nested Class Summary

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

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
DualHashBidiMap() Creates an empty HashBidiMap.
DualHashBidiMap(java.util.Map<? extends K,? extends V> map) Constructs a HashBidiMap and copies the mappings from specified Map.

Method Summary

Methods inherited from class org.apache.commons.collections4.bidimap.AbstractDualBidiMap

clear, containsKey, containsValue, entrySet, equals, get, getKey, hashCode, inverseBidiMap, isEmpty, keySet, mapIterator, put, putAll, remove, removeValue, size, toString, values

Methods inherited from class java.lang.Object

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

DualHashBidiMap

public DualHashBidiMap()

Creates an empty HashBidiMap.

DualHashBidiMap

public DualHashBidiMap(java.util.Map<? extends K,? extends V> map)

Constructs a HashBidiMap and copies the mappings from specified Map.

Parameters:

map - the map whose mappings are to be placed in this map