code: @Override
      public boolean isPreferredMech ( ASN1ObjectIdentifier mechanism ) {
          if ( isAnonymous() ) {
              return super.isPreferredMech(mechanism);
          }
          return PREFERRED_MECHS.contains(mechanism);
      }
docs: {@inheritDoc}
  
  @see jcifs.smb.NtlmPasswordAuthenticator#isPreferredMech(org.bouncycastle.asn1.ASN1ObjectIdentifier)