code: protected PrincipalUser getWardenUser(String wardenAlertName) {
          assert (wardenAlertName != null) : "Warden alert name cannot be null.";
  
          int beginIndex = wardenAlertName.indexOf("-") + 1;
          int endIndex = wardenAlertName.lastIndexOf("-");
  
          return PrincipalUser.findByUserName(emf.get(), wardenAlertName.substring(beginIndex, endIndex));
      }
docs: From warden alert name, de-constructs the user for whom this warden alert is associated with.
  
  @param   wardenAlertName  Name of warden alert
  
  @return  User associated with the warden alert