* of one-dimensional barcodes.</p>
*
* @author dswitkin@google.com (Daniel Switkin)
- * @author srowen@google.com (Sean Owen)
+ * @author Sean Owen
* @author alasdair@google.com (Alasdair Mackintosh)
*/
public abstract class AbstractUPCEANReader extends AbstractOneDReader implements UPCEANReader {
}
}
- private StringBuffer decodeRowStringBuffer;
+ private final StringBuffer decodeRowStringBuffer;
- public AbstractUPCEANReader() {
+ protected AbstractUPCEANReader() {
decodeRowStringBuffer = new StringBuffer(20);
}
int end = endRange[1];
int quietEnd = end + (end - endRange[0]);
if (quietEnd >= row.getSize() || !row.isRange(end, quietEnd, false)) {
- throw new ReaderException("Pattern not followed by whitespace");
+ throw ReaderException.getInstance();
}
String resultString = result.toString();
if (!checkChecksum(resultString)) {
- throw new ReaderException("Checksum failed");
+ throw ReaderException.getInstance();
}
float left = (float) (startGuardRange[1] + startGuardRange[0]) / 2.0f;
abstract BarcodeFormat getBarcodeFormat();
+ /**
+ * @return {@link #checkStandardUPCEANChecksum(String)}
+ */
+ boolean checkChecksum(String s) throws ReaderException {
+ return checkStandardUPCEANChecksum(s);
+ }
+
/**
* Computes the UPC/EAN checksum on a string of digits, and reports
* whether the checksum is correct or not.
* @return true iff string of digits passes the UPC/EAN checksum algorithm
* @throws ReaderException if the string does not contain only digits
*/
- boolean checkChecksum(String s) throws ReaderException {
+ public static boolean checkStandardUPCEANChecksum(String s) throws ReaderException {
int length = s.length();
if (length == 0) {
return false;
for (int i = length - 2; i >= 0; i -= 2) {
int digit = (int) s.charAt(i) - (int) '0';
if (digit < 0 || digit > 9) {
- throw new ReaderException("Illegal character during checksum");
+ throw ReaderException.getInstance();
}
sum += digit;
}
for (int i = length - 1; i >= 0; i -= 2) {
int digit = (int) s.charAt(i) - (int) '0';
if (digit < 0 || digit > 9) {
- throw new ReaderException("Illegal character during checksum");
+ throw ReaderException.getInstance();
}
sum += digit;
}
isWhite = !isWhite;
}
}
- throw new ReaderException("Can't find pattern");
+ throw ReaderException.getInstance();
}
/**
if (bestMatch >= 0) {
return bestMatch;
} else {
- throw new ReaderException("Could not match any digit in pattern");
+ throw ReaderException.getInstance();
}
}