code: public static int hash(int hash, String s) {
      if (s == null) {
        return hash;
      }
      // similar to Arrays.hashCode
      return s.indexOf('%') < 0 ? 31 * hash + s.hashCode() : normalizedHash(hash, s);
    }
docs: Hashes a string for a URI hash. Handles octets.
  
  @param hash the input hash
  @param s the string to hash and combine with the input hash
  @return the resulting hash