Package org.apache.commons.collections.map

Class CaseInsensitiveMap

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, java.util.Map, IterableMap
    @Deprecated(since="2021-04-30")
public class CaseInsensitiveMap
extends AbstractHashedMap
implements java.io.Serializable, java.lang.Cloneable
    Deprecated.
    Commons Collections 3 is in maintenance mode. Commons Collections 4 should be used instead.
    A case-insensitive Map.

    Before keys are added to the map or compared to other existing keys, they are converted to all lowercase in a locale-independent fashion by using information from the Unicode data file.

    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
    See Also:
    Serialized Form

    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.util.AbstractMap

        java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,​V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,​V extends java.lang.Object>

      • Nested classes/interfaces inherited from interface java.util.Map

        java.util.Map.Entry<K extends java.lang.Object,​V extends java.lang.Object>

    • Constructor Summary

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

    • Constructor Detail

      • CaseInsensitiveMap

        public CaseInsensitiveMap()
        Deprecated.
        Constructs a new empty map with default size and load factor.

      • CaseInsensitiveMap

        public CaseInsensitiveMap​(int initialCapacity)
        Deprecated.
        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)
        Deprecated.
        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)
        Deprecated.
        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

      • clone

        public java.lang.Object clone()
        Deprecated.
        Clones the map without cloning the keys or values.
        Returns:
        a shallow clone