code: @Nullable
    public static String wrapBidi (@Nullable final String sStr, final char cChar)
    {
      switch (cChar)
      {
        case RLE:
          return _wrap (sStr, RLE, PDF);
        case RLO:
          return _wrap (sStr, RLO, PDF);
        case LRE:
          return _wrap (sStr, LRE, PDF);
        case LRO:
          return _wrap (sStr, LRO, PDF);
        case RLM:
          return _wrap (sStr, RLM, RLM);
        case LRM:
          return _wrap (sStr, LRM, LRM);
        default:
          return sStr;
      }
    }
docs: Wrap the string with the specified bidi control
  
  @param sStr
  source string
  @param cChar
  source char
  @return The wrapped string