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Types that extend and augment the Java Collections Framework.

There is a newer version: 20040616


 


This package contains implementations of the
{@link org.apache.commons.collections.BidiMap BidiMap},
{@link org.apache.commons.collections.OrderedBidiMap OrderedBidiMap} and 
{@link org.apache.commons.collections.SortedBidiMap SortedBidiMap} interfaces.
A BidiMap is an extension to Map that allows keys and values to be looked up with equal ease.
One example usage is a system communicating to a legacy datasource that must convert codes
from the new format to the old format and vice versa.

The following implementations are provided in the package:

DualHashBidiMap - uses two HashMaps to implement BidiMap
DualTreeBidiMap - uses two TreeMaps to implement SortedBidiMap
TreeBidiMap - red-black tree implementation of OrderedBidiMap


The following decorators are provided in the package:

Unmodifiable - ensures the map cannot be altered