docs: protected boolean fileExists()
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "fileExists", this);
  
          boolean fileAlreadyExists = true;
  
          File file = new File(_logDirectory, _fileName);
          fileAlreadyExists = (file.exists() && (file.length() > 0));
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "fileExists", new Boolean(fileAlreadyExists));
          return fileAlreadyExists;
      }