An accessor map is a container for other accessors. It produces a map
which uses its contained accessors to produce objects. The
object produced by a contained accessor is cached if that accessor
states that it is cachable. Otherwise, a new object is served
by the accessor each time the accessor's key is requested.
author: Christoph Beck
This method produces a map. This map implements the
get(Object) method as follows:
It gets the accessor stored in the outer class under the specified
key and uses that accessor to produce the result object.
For subsequent request of the same key, the object is cached
if the accessor states that it is cachable.
See Also:Accessor.isCacheable