code: public static Class<?> getClass(ObjectIdentifier oid)
              throws CertificateException {
          OIDInfo info = oidMap.get(oid);
          return (info == null) ? null : info.getClazz();
      }
docs: Return the java class object associated with the object identifier.
  
  @param oid the name of the object identifier to be returned.
  @exception CertificateException if class cannot be instatiated.