2 * Copyright 2009 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.WriterException;
21 import com.google.zxing.common.BitMatrix;
23 import java.util.Hashtable;
27 * This object renders an EAN13 code as a {@link BitMatrix}.
29 * @author aripollak@gmail.com (Ari Pollak)
31 public final class EAN13Writer extends UPCEANWriter {
33 private static final int codeWidth = 3 + // start guard
34 (7 * 6) + // left bars
36 (7 * 6) + // right bars
39 public BitMatrix encode(String contents, BarcodeFormat format, int width, int height,
40 Hashtable hints) throws WriterException {
41 if (format != BarcodeFormat.EAN_13) {
42 throw new IllegalArgumentException("Can only encode EAN_13, but got " + format);
45 return super.encode(contents, format, width, height, hints);
48 public byte[] encode(String contents) {
49 if (contents.length() != 13) {
50 throw new IllegalArgumentException(
51 "Requested contents should be 13 digits long, but got " + contents.length());
54 int firstDigit = Integer.parseInt(contents.substring(0, 1));
55 int parities = EAN13Reader.FIRST_DIGIT_ENCODINGS[firstDigit];
56 byte[] result = new byte[codeWidth];
59 pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);
61 // See {@link #EAN13Reader} for a description of how the first digit & left bars are encoded
62 for (int i = 1; i <= 6; i++) {
63 int digit = Integer.parseInt(contents.substring(i, i + 1));
64 if ((parities >> (6 - i) & 1) == 1) {
67 pos += appendPattern(result, pos, UPCEANReader.L_AND_G_PATTERNS[digit], 0);
70 pos += appendPattern(result, pos, UPCEANReader.MIDDLE_PATTERN, 0);
72 for (int i = 7; i <= 12; i++) {
73 int digit = Integer.parseInt(contents.substring(i, i + 1));
74 pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], 1);
76 pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);