public SASLAuthOperation saslAuth(String[] mech, String serverName,
      Map<String, ?> props, CallbackHandler cbh, OperationCallback cb) {
    throw new UnsupportedOperationException("SASL is not supported for "
        + "ASCII protocol");
  }
Operation factory for the ascii protocol.
src/main/java/net/spy/memcached/protocol/ascii/AsciiOperationFactory.java