Decorates another Map to fix the size, preventing add/remove.
Any action that would change the size of the map is disallowed.
The put method is allowed to change the value associated with an existing
key however.
If trying to remove or clear the map, an UnsupportedOperationException is
thrown. If trying to put a new mapping into the map, an
IllegalArgumentException is thrown. This is because the put method can
succeed if the mapping's key already exists in the map, so the put method
is not always unsupported.
Note that FixedSizeMap 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.
This class is Serializable from Commons Collections 3.1.
since:
Commons Collections 3.0
version:
$Revision: 348007 $ $Date: 2005-11-21 22:52:57 +0000 (Mon, 21 Nov 2005) $
author:
Stephen Colebourne
author:
Paul Jack | 