code: public static String path2dot(String path)
    {
      return path != null ? path.replaceAll(SEPARATOR_CHAR_REX, ".") : null;
    }
docs: Convert a file path to a dot separated list of words. This utility is handy, for example, on converting file paths
  to Java packages, provided file path contains Java valid characters. Returns null if <code>path</code> parameter is
  null.
  
  @param path file path to convert.
  @return dot separated list of words or null.