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org.apache.commons.collections.map.package.html Maven / Gradle / Ivy

 


This package contains implementations of the 
{@link java.util.Map Map},
{@link org.apache.commons.collections.IterableMap IterableMap},
{@link org.apache.commons.collections.OrderedMap OrderedMap} and
{@link java.util.SortedMap SortedMap} interfaces.
A Map provides a lookup from a key to a value.
A number of implementations also support the new MapIterator interface that enables
simple iteration of map keys and values.

The following implementations are provided:

CaseInsensitiveMap - map that compares keys in a case insensitive way
CompositeMap - map that combines multiple maps into a single view
HashedMap - general purpose HashMap replacement supporting MapIterator
IdentityMap - map that uses == for comparison instead of equals()
Flat3Map - designed for good performance at size 3 or less
LinkedMap - a hash map that maintains insertion order, supporting OrderedMapIterator
MultiKeyMap - map that provides special methods for using more than one key to access the value
ReferenceMap - allows the garbage collector to collect keys and values using equals() for comparison
ReferenceIdentityMap - allows the garbage collector to collect keys and values using == for comparison
SingletonMap - a fully featured map to hold one key-value pair
StaticBucketMap - internally synchronized and designed for thread-contentious environments


The following decorators are provided:

Unmodifiable - ensures the collection cannot be altered
Predicated - ensures that only elements that are valid according to a predicate can be added
Typed - ensures that only elements that are of a specific type can be added
Transformed - transforms each element added
FixedSize - ensures that the size of the map cannot change
Lazy - creates objects in the map on demand
ListOrdered - ensures that insertion order is retained