# File lib_ctrl/rucy/control.rb, line 250
    def set_admin_params(params)
      params.each_key do |name|
        unless (ADMIN_PARAMS.include? name) then
          raise "not an administrator's parameter: #{name}."
        end
      end
      if (! params['admin_user'] || params['admin_user'].empty? ||
          ! params['admin_password'] || params['admin_password'].empty?)
      then
        params['localhost_only'] = true
      end
      @properties.set_params(params)
      nil
    end