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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * This package contains implementations of the {@link java.util.Map Map},
 * {@link org.apache.commons.collections4.IterableMap IterableMap},
 * {@link org.apache.commons.collections4.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 *
  • Flat3Map - designed for good performance at size 3 or less *
  • LinkedMap - a hash map that maintains insertion order, supporting OrderedMapIterator *
  • LRUMap - a hash map that maintains a maximum size by removing the least recently used entries *
  • 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 *
  • Transformed - transforms each element added *
  • FixedSize - ensures that the size of the map cannot change *
  • Defaulted - provides default values for non-existing keys *
  • Lazy - creates objects in the map on demand *
  • ListOrdered - ensures that insertion order is retained *
* * @version $Id: package-info.java 1469004 2013-04-17 17:37:03Z tn $ */ package org.apache.commons.collections4.map;




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