public void addAttendees(String attendees, Rfc822Validator validator) {
   final LinkedHashSet<Rfc822Token> addresses =
       EditEventHelper.getAddressesFromList(attendees, validator);
   synchronized (this) {
     for (final Rfc822Token address : addresses) {
       final Attendee attendee = new Attendee(address.getName(), address.getAddress());
       if (TextUtils.isEmpty(attendee.mName)) {
         attendee.mName = attendee.mEmail;
       }
       addAttendee(attendee);
     }
   }
 }