public static String getExportFileName(List<Integer> mailTemplateDefIDList) {
   if (mailTemplateDefIDList.size() == 1) {
     TMailTemplateDefBean mailTemplateDefBean =
         mailTemplateDefDAO.loadByPrimaryKey(mailTemplateDefIDList.get(0));
     if (mailTemplateDefBean != null) {
       Integer mailTemplateID = mailTemplateDefBean.getMailTemplate();
       TMailTemplateBean mailTemplateBean = mailTemplateDAO.loadByPrimaryKey(mailTemplateID);
       String type = mailTemplateDefBean.isPlainEmail() ? "plain" : "HTML";
       return "MAIL_TMPL_DEF-"
           + mailTemplateBean.getName()
           + "_"
           + mailTemplateDefBean.getTheLocale()
           + "_"
           + type
           + ".xml";
     }
   }
   return "MailTemplateDefs.xml";
 }