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 EAN8 code as a ByteMatrix 2D array of greyscale
30 * @author aripollak@gmail.com (Ari Pollak)
32 public final class EAN8Writer extends AbstractUPCEANWriter {
34 private static final int codeWidth = 3 + // start guard
35 (7 * 4) + // left bars
37 (7 * 4) + // right bars
40 public ByteMatrix encode(String contents, BarcodeFormat format, int width, int height,
41 Hashtable hints) throws WriterException {
42 if (format != BarcodeFormat.EAN_8) {
43 throw new IllegalArgumentException("Can only encode EAN_8, but got "
47 return super.encode(contents, format, width, height, hints);
50 /** @return a byte array of horizontal pixels (0 = white, 1 = black) */
51 public byte[] encode(String contents) {
52 if (contents.length() != 8) {
53 throw new IllegalArgumentException(
54 "Requested contents should be 8 digits long, but got " + contents.length());
57 byte[] result = new byte[codeWidth];
60 pos += appendPattern(result, pos, AbstractUPCEANReader.START_END_PATTERN, 1);
62 for (int i = 0; i <= 3; i++) {
63 int digit = Integer.parseInt(contents.substring(i, i + 1));
64 pos += appendPattern(result, pos, AbstractUPCEANReader.L_PATTERNS[digit], 0);
67 pos += appendPattern(result, pos, AbstractUPCEANReader.MIDDLE_PATTERN, 0);
69 for (int i = 4; i <= 7; i++) {
70 int digit = Integer.parseInt(contents.substring(i, i + 1));
71 pos += appendPattern(result, pos, AbstractUPCEANReader.L_PATTERNS[digit], 1);
73 pos += appendPattern(result, pos, AbstractUPCEANReader.START_END_PATTERN, 1);