2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.oned;
19 import com.google.zxing.BarcodeFormat;
20 import com.google.zxing.BinaryBitmap;
21 import com.google.zxing.ChecksumException;
22 import com.google.zxing.FormatException;
23 import com.google.zxing.NotFoundException;
24 import com.google.zxing.Result;
25 import com.google.zxing.common.BitArray;
27 import java.util.Hashtable;
30 * <p>Implements decoding of the UPC-A format.</p>
32 * @author dswitkin@google.com (Daniel Switkin)
35 public final class UPCAReader extends UPCEANReader {
37 private final UPCEANReader ean13Reader = new EAN13Reader();
39 public Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange, Hashtable hints)
40 throws NotFoundException, FormatException, ChecksumException {
41 return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, startGuardRange, hints));
44 public Result decodeRow(int rowNumber, BitArray row, Hashtable hints)
45 throws NotFoundException, FormatException, ChecksumException {
46 return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, hints));
49 public Result decode(BinaryBitmap image) throws NotFoundException, FormatException {
50 return maybeReturnResult(ean13Reader.decode(image));
53 public Result decode(BinaryBitmap image, Hashtable hints) throws NotFoundException, FormatException {
54 return maybeReturnResult(ean13Reader.decode(image, hints));
57 BarcodeFormat getBarcodeFormat() {
58 return BarcodeFormat.UPC_A;
61 protected int decodeMiddle(BitArray row, int[] startRange, StringBuffer resultString)
62 throws NotFoundException {
63 return ean13Reader.decodeMiddle(row, startRange, resultString);
66 private static Result maybeReturnResult(Result result) throws FormatException {
67 String text = result.getText();
68 if (text.charAt(0) == '0') {
69 return new Result(text.substring(1), null, result.getResultPoints(), BarcodeFormat.UPC_A);
71 throw FormatException.getFormatInstance();