2 * Copyright 2007 Google Inc.
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.upc;
19 import com.google.zxing.MonochromeBitmapSource;
20 import com.google.zxing.Reader;
21 import com.google.zxing.ReaderException;
22 import com.google.zxing.Result;
23 import com.google.zxing.ResultPoint;
25 import java.util.Hashtable;
28 * A reader which decodes UPC-A barcodes.
30 * @author dswitkin@google.com (Daniel Switkin)
32 public final class UPCReader implements Reader {
34 private static final ResultPoint[] NO_POINTS = new ResultPoint[0];
37 * Locates and decodes a UPC barcode in an image.
39 * @return a String representing the digits found
40 * @throws ReaderException if a barcode cannot be found or decoded
42 public Result decode(MonochromeBitmapSource image) throws ReaderException {
43 return decode(image, null);
46 public Result decode(MonochromeBitmapSource image, Hashtable hints)
47 throws ReaderException {
48 UPCDecoder decoder = new UPCDecoder(image);
49 String result = decoder.decode();
50 if (result == null || result.length() == 0) {
51 throw new ReaderException("No UPC barcode found");
53 return new Result(result, NO_POINTS);