Android Open Source - metawear-antifitness Unknown Response Exception

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package no.nordicsemi.android.nrftoolbox.dfu;

public class UnknownResponseException extends Exception {
  private static final long serialVersionUID = -8716125467309979289L;
  private static final char[] HEX_ARRAY = { '0', '1', '2', '3', '4', '5',
      '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

  private final byte[] mResponse;
  private final int mExpectedOpCode;

  public UnknownResponseException(final String message,
      final byte[] response, final int expectedOpCode) {
    super(message);

    mResponse = response != null ? response : new byte[0];
    mExpectedOpCode = expectedOpCode;
  }

  @Override
  public String getMessage() {
    return String.format("%s (response: %s, expected: 0x10%02X..)",
        super.getMessage(), bytesToHex(mResponse, 0, mResponse.length),
        mExpectedOpCode);
  }

  public static String bytesToHex(final byte[] bytes, final int start,
      final int length) {
    if (bytes == null || bytes.length <= start || length <= 0)
      return "";

    final int maxLength = Math.min(length, bytes.length - start);
    final char[] hexChars = new char[maxLength * 2];
    for (int j = 0; j < maxLength; j++) {
      final int v = bytes[start + j] & 0xFF;
      hexChars[j * 2] = HEX_ARRAY[v >>> 4];
      hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
    }
    return "0x" + new String(hexChars);
  }
}

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