2 * Licensed under the Apache License, Version 2.0 (the "License");
\r
3 * you may not use this file except in compliance with the License.
\r
4 * You may obtain a copy of the License at
\r
6 * http://www.apache.org/licenses/LICENSE-2.0
\r
8 * Unless required by applicable law or agreed to in writing, software
\r
9 * distributed under the License is distributed on an "AS IS" BASIS,
\r
10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
\r
11 * See the License for the specific language governing permissions and
\r
12 * limitations under the License.
\r
14 namespace com.google.zxing.oned
\r
17 * @author dswitkin@google.com (Daniel Switkin)
\r
21 using com.google.zxing.common;
\r
23 public sealed class MultiFormatUPCEANReader : AbstractOneDReader
\r
25 private System.Collections.ArrayList readers;
\r
26 public MultiFormatUPCEANReader(System.Collections.Hashtable hints) {
\r
27 System.Collections.ArrayList possibleFormats = hints == null ? null : (System.Collections.ArrayList) hints[DecodeHintType.POSSIBLE_FORMATS];
\r
28 readers = new System.Collections.ArrayList();
\r
29 if (possibleFormats != null) {
\r
30 if (possibleFormats.Contains(BarcodeFormat.EAN_13)) {
\r
31 readers.Add(new EAN13Reader());
\r
32 } else if (possibleFormats.Contains(BarcodeFormat.UPC_A)) {
\r
33 readers.Add(new UPCAReader());
\r
35 if (possibleFormats.Contains(BarcodeFormat.EAN_8)) {
\r
36 readers.Add(new EAN8Reader());
\r
38 if (possibleFormats.Contains(BarcodeFormat.UPC_E)) {
\r
39 readers.Add(new UPCEReader());
\r
42 if (readers.Count==0) {
\r
43 readers.Add(new EAN13Reader());
\r
44 // UPC-A is covered by EAN-13
\r
45 readers.Add(new EAN8Reader());
\r
46 readers.Add(new UPCEReader());
\r
50 public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints) {
\r
51 // Compute this location once and reuse it on multiple implementations
\r
52 int[] startGuardPattern = AbstractUPCEANReader.findStartGuardPattern(row);
\r
53 int size = readers.Count;
\r
54 for (int i = 0; i < size; i++) {
\r
55 UPCEANReader reader = (UPCEANReader) readers[i];
\r
58 result = reader.decodeRow(rowNumber, row, startGuardPattern);
\r
59 } catch (ReaderException re) {
\r
62 // Special case: a 12-digit code encoded in UPC-A is identical to a "0"
\r
63 // followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
\r
64 // UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
\r
65 // Individually these are correct and their readers will both read such a code
\r
66 // and correctly call it EAN-13, or UPC-A, respectively.
\r
68 // In this case, if we've been looking for both types, we'd like to call it
\r
69 // a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
\r
70 // UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
\r
71 // result if appropriate.
\r
72 if (result.getBarcodeFormat().Equals(BarcodeFormat.EAN_13) && result.getText()[0] == '0') {
\r
73 return new Result(result.getText().Substring(1), null, result.getResultPoints(), BarcodeFormat.UPC_A);
\r
78 throw new ReaderException();
\r