/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.oned;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import java.util.Hashtable;
/**
* This object renders an EAN13 code as a {@link BitMatrix}.
*
* @author aripollak@gmail.com (Ari Pollak)
*/
public final class EAN13Writer extends UPCEANWriter {
private static final int codeWidth = 3 + // start guard
(7 * 6) + // left bars
5 + // middle guard
(7 * 6) + // right bars
3; // end guard
public BitMatrix encode(String contents, BarcodeFormat format, int width, int height,
Hashtable hints) throws WriterException {
if (format != BarcodeFormat.EAN_13) {
throw new IllegalArgumentException("Can only encode EAN_13, but got " + format);
}
return super.encode(contents, format, width, height, hints);
}
public byte[] encode(String contents) {
if (contents.length() != 13) {
throw new IllegalArgumentException(
"Requested contents should be 13 digits long, but got " + contents.length());
}
int firstDigit = Integer.parseInt(contents.substring(0, 1));
int parities = EAN13Reader.FIRST_DIGIT_ENCODINGS[firstDigit];
byte[] result = new byte[codeWidth];
int pos = 0;
pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);
// See {@link #EAN13Reader} for a description of how the first digit & left bars are encoded
for (int i = 1; i <= 6; i++) {
int digit = Integer.parseInt(contents.substring(i, i + 1));
if ((parities >> (6 - i) & 1) == 1) {
digit += 10;
}
pos += appendPattern(result, pos, UPCEANReader.L_AND_G_PATTERNS[digit], 0);
}
pos += appendPattern(result, pos, UPCEANReader.MIDDLE_PATTERN, 0);
for (int i = 7; i <= 12; i++) {
int digit = Integer.parseInt(contents.substring(i, i + 1));
pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], 1);
}
pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);
return result;
}
}