Method percentEncode

api/src/main/java/io/grpc/Uri.java:1113–1144

(String s, BitSet allowedCodePoints)

  }

  @Nullable
  private static String percentEncode(String s, BitSet allowedCodePoints) {
    if (s == null) {
      return null;
    }
    CharsetEncoder encoder =
        StandardCharsets.UTF_8
            .newEncoder()
            .onMalformedInput(CodingErrorAction.REPORT)
            .onUnmappableCharacter(CodingErrorAction.REPORT);
    ByteBuffer utf8Bytes;
    try {
      utf8Bytes = encoder.encode(CharBuffer.wrap(s));
    } catch (MalformedInputException e) {
      throw new IllegalArgumentException("Malformed input", e); // Must be a broken surrogate pair.
    } catch (CharacterCodingException e) {
      throw new VerifyException(e); // Should not happen when encoding to UTF-8.
    }

    StringBuilder sb = new StringBuilder();
    while (utf8Bytes.hasRemaining()) {
      int b = 0xff & utf8Bytes.get();
      if (allowedCodePoints.get(b)) {
        sb.append((char) b);
      } else {
        sb.append('%');
        sb.append(hexDigitsByVal[(b & 0xF0) >> 4]);
        sb.append(hexDigitsByVal[b & 0x0F]);
      }
    }
    return sb.toString();
  }

  private static void checkPercentEncodedArg(String s, String what, BitSet allowedChars) {
    percentDecode(s, what, allowedChars, null);