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.MonochromeBitmapSource;
21 import com.google.zxing.ReaderException;
22 import com.google.zxing.Result;
23 import com.google.zxing.common.BitArray;
25 import java.util.Hashtable;
28 * <p>Implements decoding of the UPC-A format.</p>
30 * @author dswitkin@google.com (Daniel Switkin)
31 * @author srowen@google.com (Sean Owen)
33 public final class UPCAReader implements UPCEANReader {
35 private final UPCEANReader ean13Reader = new EAN13Reader();
37 public Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange) throws ReaderException {
38 return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, startGuardRange));
41 public Result decodeRow(int rowNumber, BitArray row, Hashtable hints) throws ReaderException {
42 return maybeReturnResult(ean13Reader.decodeRow(rowNumber, row, hints));
45 public Result decode(MonochromeBitmapSource image) throws ReaderException {
46 return maybeReturnResult(ean13Reader.decode(image));
49 public Result decode(MonochromeBitmapSource image, Hashtable hints) throws ReaderException {
50 return maybeReturnResult(ean13Reader.decode(image, hints));
53 private static Result maybeReturnResult(Result result) throws ReaderException {
54 String text = result.getText();
55 if (text.charAt(0) == '0') {
56 return new Result(text.substring(1), null, result.getResultPoints(), BarcodeFormat.UPC_A);
58 throw new ReaderException("Found EAN-13 code but was not a UPC-A code");