public Class CaseInsensitiveMap<K, V>

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

The example above 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}.

This map will violate the detail of various Map and map view contracts. As a general rule, don't compare this map to other maps. In particular, you can't use decorators like ListOrderedMap on it, which silently assume that these contracts are fulfilled.

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 java.util.Collections#synchronizedMap(Map). This class may throw exceptions when accessed by concurrent threads without synchronization.