DragonKeyboardFirmwareUpdater/dfu/src/no/nordicsemi/android/dfu/internal/exception/UnknownResponseException.java

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package no.nordicsemi.android.dfu.internal.exception;

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);
	}
}