public DetectorResult[] detectMulti(Map<DecodeHintType, ?> hints) throws NotFoundException {
BitMatrix image = getImage();
ResultPointCallback resultPointCallback =
hints == null
? null
: (ResultPointCallback) hints.get(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
MultiFinderPatternFinder finder = new MultiFinderPatternFinder(image, resultPointCallback);
FinderPatternInfo[] infos = finder.findMulti(hints);
if (infos.length == 0) {
throw NotFoundException.getNotFoundInstance();
}
List<DetectorResult> result = new ArrayList<>();
for (FinderPatternInfo info : infos) {
try {
result.add(processFinderPatternInfo(info));
} catch (ReaderException e) {
// ignore
}
}
if (result.isEmpty()) {
return EMPTY_DETECTOR_RESULTS;
} else {
return result.toArray(new DetectorResult[result.size()]);
}
}
private static String processFixedAI(int aiSize, int fieldSize, String rawInformation)
throws NotFoundException {
if (rawInformation.length() < aiSize) {
throw NotFoundException.getNotFoundInstance();
}
String ai = rawInformation.substring(0, aiSize);
if (rawInformation.length() < aiSize + fieldSize) {
throw NotFoundException.getNotFoundInstance();
}
String field = rawInformation.substring(aiSize, aiSize + fieldSize);
String remaining = rawInformation.substring(aiSize + fieldSize);
String result = '(' + ai + ')' + field;
String parsedAI = parseFieldsInGeneralPurpose(remaining);
return parsedAI == null ? result : result + parsedAI;
}
static String parseFieldsInGeneralPurpose(String rawInformation) throws NotFoundException {
if (rawInformation.isEmpty()) {
return null;
}
// Processing 2-digit AIs
if (rawInformation.length() < 2) {
throw NotFoundException.getNotFoundInstance();
}
String firstTwoDigits = rawInformation.substring(0, 2);
for (Object[] dataLength : TWO_DIGIT_DATA_LENGTH) {
if (dataLength[0].equals(firstTwoDigits)) {
if (dataLength[1] == VARIABLE_LENGTH) {
return processVariableAI(2, (Integer) dataLength[2], rawInformation);
}
return processFixedAI(2, (Integer) dataLength[1], rawInformation);
}
}
if (rawInformation.length() < 3) {
throw NotFoundException.getNotFoundInstance();
}
String firstThreeDigits = rawInformation.substring(0, 3);
for (Object[] dataLength : THREE_DIGIT_DATA_LENGTH) {
if (dataLength[0].equals(firstThreeDigits)) {
if (dataLength[1] == VARIABLE_LENGTH) {
return processVariableAI(3, (Integer) dataLength[2], rawInformation);
}
return processFixedAI(3, (Integer) dataLength[1], rawInformation);
}
}
for (Object[] dataLength : THREE_DIGIT_PLUS_DIGIT_DATA_LENGTH) {
if (dataLength[0].equals(firstThreeDigits)) {
if (dataLength[1] == VARIABLE_LENGTH) {
return processVariableAI(4, (Integer) dataLength[2], rawInformation);
}
return processFixedAI(4, (Integer) dataLength[1], rawInformation);
}
}
if (rawInformation.length() < 4) {
throw NotFoundException.getNotFoundInstance();
}
String firstFourDigits = rawInformation.substring(0, 4);
for (Object[] dataLength : FOUR_DIGIT_DATA_LENGTH) {
if (dataLength[0].equals(firstFourDigits)) {
if (dataLength[1] == VARIABLE_LENGTH) {
return processVariableAI(4, (Integer) dataLength[2], rawInformation);
}
return processFixedAI(4, (Integer) dataLength[1], rawInformation);
}
}
throw NotFoundException.getNotFoundInstance();
}