code: public boolean hasRoles(String... roleIdentifiers) {
          List<Role> requiredRoles = new ArrayList<>();
          for (String roleIdentifier : roleIdentifiers) {
              requiredRoles.add(new Role(roleIdentifier));
          }
          return roles.containsAll(requiredRoles);
      }
docs: Returns {@code true} if this Account has the specified roles, {@code false} otherwise.
  
  @param roleIdentifiers the application-specific role identifiers to check (usually role ids or role names).
  @return {@code true} if this Account has all the specified roles, {@code false} otherwise.