This public method is used by the PolicyContext/ class to
activate the handler and obtain from it the the context object
identified by the (case-sensitive) key.
This method is used to obtain an instance of the provider specific class
that implements the PolicyConfiguration interface that corresponds to
the identified policy context within the provider.
This public method returns a boolean result indicating whether or not
the handler supports the context object identified by the
(case-sensitive) key value.