docs: LogFileHeader logFileHeader() throws InternalLogException
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "logFileHeader", this);
  
          // Check that the file is actually open
          if (_activeFile == null)
          {
              if (tc.isEntryEnabled())
                  Tr.exit(tc, "logFileHeader", "InternalLogException");
              throw new InternalLogException(null);
          }
  
          final LogFileHeader logFileHeader = _activeFile.logFileHeader();
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "logFileHeader", logFileHeader);
          return logFileHeader;
      }