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Core barcode encoding/decoding library
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/*
 * 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.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import java.util.Map;

/**
 * This object renders an EAN8 code as a {@link BitMatrix}.
 *
 * @author [email protected] (Ari Pollak)
 */
public final class EAN8Writer extends UPCEANWriter {

  private static final int CODE_WIDTH = 3 + // start guard
      (7 * 4) + // left bars
      5 + // middle guard
      (7 * 4) + // right bars
      3; // end guard

  @Override
  public BitMatrix encode(String contents,
                          BarcodeFormat format,
                          int width,
                          int height,
                          Map hints) throws WriterException {
    if (format != BarcodeFormat.EAN_8) {
      throw new IllegalArgumentException("Can only encode EAN_8, but got "
          + format);
    }

    return super.encode(contents, format, width, height, hints);
  }

  /** @return a byte array of horizontal pixels (0 = white, 1 = black) */
  @Override
  public byte[] encode(String contents) {
    if (contents.length() != 8) {
      throw new IllegalArgumentException(
          "Requested contents should be 8 digits long, but got " + contents.length());
    }

    byte[] result = new byte[CODE_WIDTH];
    int pos = 0;

    pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, 1);

    for (int i = 0; i <= 3; i++) {
      int digit = Integer.parseInt(contents.substring(i, i + 1));
      pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], 0);
    }

    pos += appendPattern(result, pos, UPCEANReader.MIDDLE_PATTERN, 0);

    for (int i = 4; i <= 7; 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;
  }

}