This is a basic implementation of
AttributeFactory. It implements the insertion and retrieval methods, but doesn't actually setup the factory with any datatypes.
Note that while this class is thread-safe on all creation methods, it is not safe to add support for a new datatype while creating an instance of a value. This follows from the assumption that most people will initialize these factories up-front, and then start processing without ever modifying the factories. If you need these mutual operations to be thread-safe, then you should write a wrapper class that implements the right synchronization.
@since 1.2
@author Seth Proctor