| If the GrantedAuthority can be represented as a String and that
String is sufficient in precision to be relied upon for an access control decision by an
AccessDecisionManager (or delegate), this method should return such a String.If the
GrantedAuthority cannot be expressed with sufficient precision as a String,
null should be returned. Returning null will require an
AccessDecisionManager (or delegate) to specifically support the GrantedAuthority
implementation, so returning null should be avoided unless actually required.
a representation of the granted authority (or null if the granted authority cannot beexpressed as a String with sufficient precision). |