abstractpublic class MapFacade implements Map(Code)
Facade used to put a
Map API atop another object. For example, a sublcass might allow
the
javax.servlet.http.HttpSession to be treated like a Map for purposes of referencing session
attributes from expressions.
Get an
Enumeration of the keys associated with a backing object. Note,
an
Enumeration is used here because many web-based attribute maps
expose their list of keys only as enumeration objects.
the Enumeration of keys available from the backing object
Subclasses should implement this method in order to get a value from the
backing object.
Parameters: key - the key of the object the value associated with the key.
Subclasses should implement this method in order to set a value in
the backing object.
Parameters: key - the key of the object Parameters: value - the value to associate with the key the previous value associated with this key or null if no value was associated