code: public String getSourceInfoMessage() {
          String msg;
          if (mUnit == null) {
              if (mInfo == null) {
                  msg = "";
              }
              else {
                  msg = String.valueOf(mInfo.getLine());
              }
          }
          else {
              if (mInfo == null) {
                  msg = mUnit.getName();
              }
              else {
                  msg =
                      mUnit.getName() + ':' + mInfo.getLine();
              }
          }
  
          return msg;
      }
docs: Get the source file information associated with this event.  The source
  file information includes the name of the associated template and
  potential line number.
  
  @return The source file information associated with the event