Weblogic Custom Authorizer

Hi All,
    Forgive me if this has been asked before but I couldn't find something that
was related to the topic at hand. 
    I am trying to develop a custom authenticator and authorizer for Weblogic
10. The authentication provider is ready and I am able to create users and
groups in the custom schema and have weblogic display and add/update them
through the admin console.
   Now when I am trying to develop the authorization compoenent, I don't see any
methods where in new roles are created. (Just as authentication provides methods
to create new user/groups), does authorizer provide that capability?  I need to
create roles as there is an existing set of roles that I must use and create or
modify new roles in the existing schema. My authorization component class
signature is as follows 
[b][i]public final class XXXXAuthorizationProviderImpl
      implements DeployableAuthorizationProviderV2, AccessDecision, Version