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 java.util.Hashtable;
21 import com.google.zxing.BarcodeFormat;
22 import com.google.zxing.WriterException;
23 import com.google.zxing.common.ByteMatrix;
27 * This object renders an EAN13 code as a ByteMatrix 2D array of greyscale
30 * @author aripollak@gmail.com (Ari Pollak)
32 public final class EAN13Writer extends AbstractUPCEANWriter {
34 private static final int codeWidth = 3 + // start guard
35 (7 * 6) + // left bars
37 (7 * 6) + // right bars
40 public ByteMatrix encode(String contents, BarcodeFormat format, int width, int height,
41 Hashtable hints) throws WriterException {
42 if (format != BarcodeFormat.EAN_13) {
43 throw new IllegalArgumentException("Can only encode EAN_13, but got " + format);
46 return super.encode(contents, format, width, height, hints);
49 public byte[] encode(String contents) {
50 if (contents.length() != 13) {
51 throw new IllegalArgumentException(
52 "Requested contents should be 13 digits long, but got " + contents.length());
55 int firstDigit = Integer.parseInt(contents.substring(0, 1));
56 int parities = EAN13Reader.FIRST_DIGIT_ENCODINGS[firstDigit];
57 byte[] result = new byte[codeWidth];
60 pos += appendPattern(result, pos, AbstractUPCEANReader.START_END_PATTERN, 1);
62 // See {@link #EAN13Reader} for a description of how the first digit & left bars are encoded
63 for (int i = 1; i <= 6; i++) {
64 int digit = Integer.parseInt(contents.substring(i, i + 1));
65 if ((parities >> (6 - i) & 1) == 1) {
68 pos += appendPattern(result, pos, AbstractUPCEANReader.L_AND_G_PATTERNS[digit], 0);
71 pos += appendPattern(result, pos, AbstractUPCEANReader.MIDDLE_PATTERN, 0);
73 for (int i = 7; i <= 12; i++) {
74 int digit = Integer.parseInt(contents.substring(i, i + 1));
75 pos += appendPattern(result, pos, AbstractUPCEANReader.L_PATTERNS[digit], 1);
77 pos += appendPattern(result, pos, AbstractUPCEANReader.START_END_PATTERN, 1);