code: public static String dot2path(String qualifiedName)
    {
      return qualifiedName != null ? DOT_PATTERN.matcher(qualifiedName).replaceAll(Matcher.quoteReplacement(File.separator)) : null;
    }
docs: Replace all dots from given qualified name with platform specific path separator.
  
  <pre>
  js.net.Transaction -&gt; js/net/Transaction or js\net\Transaction
  </pre>
  
  Returns null if <code>qualifiedName</code> parameter is null.
  
  @param qualifiedName qualified name.
  @return resulting path or null.