Creates a SaslServer using the parameters supplied.

  Creates a SaslServer using the parameters supplied.
It returns null
if no SaslServer can be created using the parameters supplied.
Throws SaslException if it cannot create a SaslServer
because of an error.
Returns: A possibly null SaslServer created using the parameters supplied. If null, this factory cannot produce a SaslServer using the parameters supplied.
Parameters:
- mechanism - The non-null IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
- protocol - The non-null string name of the protocol for which the authentication is being performed (e.g., "ldap").
- serverName - The non-null fully qualified host name of the server to authenticate to.
- props - The possibly null set of properties used to select the SASL mechanism and to configure the authentication exchange of the selected mechanism. See the Sasl class for a list of standard properties. Other, possibly mechanism-specific, properties can be included. Properties not relevant to the selected mechanism are ignored, including any map entries with non-String keys.
- cbh - The possibly null callback handler to used by the SASL mechanisms to get further information from the application/library to complete the authentication. For example, a SASL mechanism might require the authentication ID, password and realm from the caller. The authentication ID is requested by using a NameCallback. The password is requested by using a PasswordCallback. The realm is requested by using a RealmChoiceCallback if there is a list of realms to choose from, and by using a RealmCallback if the realm must be entered.
Throws:
- SaslException - If cannot create a SaslServer because of an error.

  Returns an array of names of mechanisms that match the specified mechanism selection policies.

  Returns an array of names of mechanisms that match the specified
mechanism selection policies.
Returns: A non-null array containing a IANA-registered SASL mechanism names.
Parameters:
- props - The possibly null set of properties used to specify the security policy of the SASL mechanisms. For example, if props contains the Sasl.POLICY_NOPLAINTEXT property with the value "true", then the factory must not return any SASL mechanisms that are susceptible to simple plain passive attacks. See the Sasl class for a complete list of policy properties. Non-policy related properties, if present in props, are ignored, including any map entries with non-String keys.