这是QRCodeDecoder类中的decode源码，求大神帮忙，这个是什么问题

public byte[] decode(QRCodeImage qrCodeImage) throws DecodingFailedException {    

Point[] adjusts = getAdjustPoints();    

Vector results = new Vector();    

numTryDecode = 0;    

while (numTryDecode < adjusts.length) {    

try {    

DecodeResult result = decode(qrCodeImage, adjusts[numTryDecode]);    

if (result.isCorrectionSucceeded()) {    

return result.getDecodedBytes();    

}    

else {    

results.addElement(result);    

}    

} catch (DecodingFailedException dfe) {    

if (dfe.getMessage().indexOf("Finder Pattern") >= 0)    

throw dfe;    

} finally {    

numTryDecode += 1;    

}    

}    

if (results.size() == 0)    

throw new DecodingFailedException("Give up decoding");