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.ByteMatrix;
23 import java.util.Hashtable;
26 * This object renders an EAN8 code as a ByteMatrix 2D array of greyscale
29 * @author aripollak@gmail.com (Ari Pollak)
31 public final class EAN8Writer extends UPCEANWriter {
33 private static final int codeWidth = 3 + // start guard
34 (7 * 4) + // left bars
36 (7 * 4) + // right bars
39 public ByteMatrix encode(String contents, BarcodeFormat format, int width, int height,
40 Hashtable hints) throws WriterException {
41 if (format != BarcodeFormat.EAN_8) {
42 throw new IllegalArgumentException("Can only encode EAN_8, but got "
46 return super.encode(contents, format, width, height, hints);
49 /** @return a byte array of horizontal pixels (0 = white, 1 = black) */
50 public byte[] encode(String contents) {
51 if (contents.length() != 8) {
52 throw new IllegalArgumentException(
53 "Requested contents should be 8 digits long, but got " + contents.length());
56 byte[] result = new byte[codeWidth];
59 pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);
61 for (int i = 0; i <= 3; i++) {
62 int digit = Integer.parseInt(contents.substring(i, i + 1));
63 pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], 0);
66 pos += appendPattern(result, pos, UPCEANReader.MIDDLE_PATTERN, 0);
68 for (int i = 4; i <= 7; i++) {
69 int digit = Integer.parseInt(contents.substring(i, i + 1));
70 pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], 1);
72 pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);