/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ntu.com.google.zxing.oned;
import java.util.Hashtable;
import ntu.com.google.zxing.BarcodeFormat;
import ntu.com.google.zxing.BinaryBitmap;
import ntu.com.google.zxing.ChecksumException;
import ntu.com.google.zxing.FormatException;
import ntu.com.google.zxing.NotFoundException;
import ntu.com.google.zxing.Result;
import ntu.com.google.zxing.common.BitArray;
/**
* <p>Implements decoding of the UPC-A format.</p>
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Sean Owen
*/
public final class UPCAReader extends UPCEANReader {
private final UPCEANReader ean13Reader = new EAN13Reader();
public Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange, Hashtable hints)
throws NotFoundException, FormatException, ChecksumException {
return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, startGuardRange, hints));
}
public Result decodeRow(int rowNumber, BitArray row, Hashtable hints)
throws NotFoundException, FormatException, ChecksumException {
return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, hints));
}
public Result decode(BinaryBitmap image) throws NotFoundException, FormatException {
return maybeReturnResult(ean13Reader.decode(image));
}
public Result decode(BinaryBitmap image, Hashtable hints) throws NotFoundException, FormatException {
return maybeReturnResult(ean13Reader.decode(image, hints));
}
BarcodeFormat getBarcodeFormat() {
return BarcodeFormat.UPC_A;
}
protected int decodeMiddle(BitArray row, int[] startRange, StringBuffer resultString)
throws NotFoundException {
return ean13Reader.decodeMiddle(row, startRange, resultString);
}
private static Result maybeReturnResult(Result result) throws FormatException {
String text = result.getText();
if (text.charAt(0) == '0') {
return new Result(text.substring(1), null, result.getResultPoints(), BarcodeFormat.UPC_A);
} else {
throw FormatException.getFormatInstance();
}
}
}