xml - stax parsing using java if element value blank then assign parsing element to upper element -

i parsing big xml input data using stax parser.

my input xml part below

<user> <loginname>abcd</loginname> <firstname>abcd</firstname> <lastname>kkk</lastname> <companyname>infosys</companyname> <emailaddress>mmm@gmail.com</emailaddress> <corporateemailaddress></corporateemailaddress> </user> 

my stax code below

private static message parsemessage(xmlstreamreader xr)             throws xmlstreamexception {         string username = null;         string content = null;         string email = null;         string comp = null;          while (xr.hasnext()) {             int event = xr.next();             switch (event) {                 case xmlstreamconstants.start_element: {                     string elname = xr.getlocalname();                     if (login_name.equals(elname)) {                         username = xr.getelementtext();                     } else if (content.equals(elname)) {                         content = stringutils.trimtoempty(xr.getelementtext());                         content = content.replace("\n"," ");                      } else if (corp_email_address.equals(elname)) {                         email = xr.getelementtext();                         /*if(email.equals(""))                             email ="unknown";*/                          conv.emails.add(email);                     }                      else if (company_name.equals(elname)) {                         comp = xr.getelementtext();                         conv.comps.add(comp);                         //system.out.println(comp);                     }                      break;                 }                 case xmlstreamconstants.end_element: {                     string elname = xr.getlocalname();                     if (message.equals(elname)) {                          return new message(username, content,email);                     }                     break;                 }                 case xmlstreamconstants.end_document:                     throw new xmlstreamexception("xml not well-formed: <"                         + message + "> tag not closed");             }           } 

here in code if xr.getelementtext(email) null doesnot have value. in case want use tag value

so how assign again xr.elementtext loginvalue? when cor-email null

please help