code: public static String codePointToString(String point)
      {
          String ret;
  
          if (Strings.isNullOrEmpty(point))
          {
              return point;
          }
  
          int unicodeScalar = Integer.parseInt(point, 16);
  
          if (Character.isSupplementaryCodePoint(unicodeScalar))
          {
              ret = String.valueOf(Character.toChars(unicodeScalar));
          } else
          {
              ret = String.valueOf((char) unicodeScalar);
          }
  
          return ret;
      }
docs: Transforms an Unicode code point, given as a hex string, into a proper
  encoded string. Supplementary code points are encoded in UTF-16 as
  required by Java.
  
  @param point
  The Unicode code point as a hex string
  @return the proper encoded string reification of a given point