org.apache.commons.collections.bidimap
Class DualHashBidiMap

java.lang.Object
  |
  +--org.apache.commons.collections.bidimap.AbstractDualBidiMap
        |
        +--org.apache.commons.collections.bidimap.DualHashBidiMap

All Implemented Interfaces:

BidiMap, IterableMap, java.util.Map, java.io.Serializable

public class DualHashBidiMap

extends AbstractDualBidiMap

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:

Commons Collections 3.0

Version:

$Id: DualHashBidiMap.java,v 1.7 2004/06/11 23:27:37 scolebourne Exp $

Author:

Matthew Hawthorne, Stephen Colebourne

See Also:

Serialized Form

Constructor Summary

DualHashBidiMap()
Creates an empty HashBidiMap.

DualHashBidiMap(java.util.Map map)
Constructs a HashBidiMap and copies the mappings from specified Map.

Methods inherited from class org.apache.commons.collections.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

Constructor Detail

DualHashBidiMap

public DualHashBidiMap()

Creates an empty HashBidiMap.

DualHashBidiMap

public DualHashBidiMap(java.util.Map map)

Constructs a HashBidiMap and copies the mappings from specified Map.

Parameters:

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