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## org.apache.commons.collections.map
Class CaseInsensitiveMap

    java.lang.Object
      java.util.AbstractMap
          org.apache.commons.collections.map.AbstractHashedMap
              org.apache.commons.collections.map.CaseInsensitiveMap

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, java.util.Map, IterableMap

    public class CaseInsensitiveMap

extends AbstractHashedMap
implements java.io.Serializable, java.lang.Cloneable

A case-insensitive `Map`.

As entries are added to the map, keys are converted to all lowercase. A new key is compared to existing keys by comparing `newKey.toString().toLower()` to the lowercase values in the current `KeySet.`

Null keys are supported.

The `keySet()` method returns all lowercase keys, or nulls.

Example:

      Map map = new CaseInsensitiveMap();
      map.put("One", "One");
      map.put("Two", "Two");
      map.put(null, "Three");
      map.put("one", "Four");

creates a `CaseInsensitiveMap` with three entries.
`map.get(null)` returns `"Three"` and `map.get("ONE")` returns `"Four".` The `Set` returned by `keySet()` equals `{"one", "two", null}.`

Note that CaseInsensitiveMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. The simplest approach is to wrap this map using `Collections.synchronizedMap(Map)`. This class may throw exceptions when accessed by concurrent threads without synchronization.

Since:
  Commons Collections 3.0
Version:
  $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
Author:
  Commons-Collections team
See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections.map.AbstractHashedMap
`AbstractHashedMap.EntrySet, AbstractHashedMap.EntrySetIterator, AbstractHashedMap.HashEntry, AbstractHashedMap.HashIterator, AbstractHashedMap.HashMapIterator, AbstractHashedMap.KeySet, AbstractHashedMap.KeySetIterator, AbstractHashedMap.Values, AbstractHashedMap.ValuesIterator`

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

Field Summary

Fields inherited from class org.apache.commons.collections.map.AbstractHashedMap
`data, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD, entrySet, GETKEY_INVALID, GETVALUE_INVALID, keySet, loadFactor, MAXIMUM_CAPACITY, modCount, NO_NEXT_ENTRY, NO_PREVIOUS_ENTRY, NULL, REMOVE_INVALID, SETVALUE_INVALID, size, threshold, values`

Constructor Summary
`CaseInsensitiveMap()` Constructs a new empty map with default size and load factor.
`CaseInsensitiveMap(int initialCapacity)` Constructs a new, empty map with the specified initial capacity.
`CaseInsensitiveMap(int initialCapacity, float loadFactor)` Constructs a new, empty map with the specified initial capacity and load factor.
`CaseInsensitiveMap(java.util.Map map)` Constructor copying elements from another map.

Method Summary
`java.lang.Object` | `clone()` Clones the map without cloning the keys or values.
`protected java.lang.Object` | `convertKey(java.lang.Object key)` Overrides convertKey() from `AbstractHashedMap` to convert keys to lower case.

Methods inherited from class org.apache.commons.collections.map.AbstractHashedMap
`addEntry, addMapping, calculateNewCapacity, calculateThreshold, checkCapacity, clear, containsKey, containsValue, createEntry, createEntrySetIterator, createKeySetIterator, createValuesIterator, destroyEntry, doReadObject, doWriteObject, ensureCapacity, entryHashCode, entryKey, entryNext, entrySet, entryValue, equals, get, getEntry, hash, hashCode, hashIndex, init, isEmpty, isEqualKey, isEqualValue, keySet, mapIterator, put, putAll, remove, removeEntry, removeMapping, reuseEntry, size, toString, updateEntry, values`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### CaseInsensitiveMap

    public CaseInsensitiveMap()

  Constructs a new empty map with default size and load factor.

### CaseInsensitiveMap

    public CaseInsensitiveMap(int initialCapacity)

  Constructs a new, empty map with the specified initial capacity.

  Parameters:
    `initialCapacity` - the initial capacity
  Throws:
    `java.lang.IllegalArgumentException` - if the initial capacity is less than one

### CaseInsensitiveMap

    public CaseInsensitiveMap(int initialCapacity,
                              float loadFactor)

  Constructs a new, empty map with the specified initial capacity and load factor.

  Parameters:
    `initialCapacity` - the initial capacity
    `loadFactor` - the load factor
  Throws:
    `java.lang.IllegalArgumentException` - if the initial capacity is less than one
    `java.lang.IllegalArgumentException` - if the load factor is less than zero

### CaseInsensitiveMap

    public CaseInsensitiveMap(java.util.Map map)

  Constructor copying elements from another map.

  Keys will be converted to lower case strings, which may cause some entries to be removed (if string representation of keys differ only by character case).

  Parameters:
    `map` - the map to copy
  Throws:
    `java.lang.NullPointerException` - if the map is null

Method Detail

### convertKey

    protected java.lang.Object convertKey(java.lang.Object key)

  Overrides convertKey() from `AbstractHashedMap` to convert keys to lower case.

  Returns null if key is null.

  Overrides:
    `convertKey` in class `AbstractHashedMap`
  Parameters:
    `key` - the key convert
  Returns:
    the converted key

### clone

    public java.lang.Object clone()

  Clones the map without cloning the keys or values.

  Overrides:
    `clone` in class `AbstractHashedMap`
  Returns:
    a shallow clone

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