content: /*
   * 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.ailiwean.core.zxing.core.oned;
  
  
  import com.ailiwean.core.zxing.core.BarcodeFormat;
  import com.ailiwean.core.zxing.core.FormatException;
  
  import java.util.Collection;
  import java.util.Collections;
  
  /**
   * 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 CODE_WIDTH = 3 + // start guard
        (7 * 6) + // left bars
        5 + // middle guard
        (7 * 6) + // right bars
        3; // end guard
  
    @Override
    protected Collection<BarcodeFormat> getSupportedWriteFormats() {
      return Collections.singleton(BarcodeFormat.EAN_13);
    }
  
    @Override
    public boolean[] encode(String contents) {
      int length = contents.length();
      switch (length) {
        case 12:
          // No check digit present, calculate it and add it
          int check;
          try {
            check = UPCEANReader.getStandardUPCEANChecksum(contents);
          } catch (FormatException fe) {
            throw new IllegalArgumentException(fe);
          }
          contents += check;
          break;
        case 13:
          try {
            if (!UPCEANReader.checkStandardUPCEANChecksum(contents)) {
              throw new IllegalArgumentException("Contents do not pass checksum");
            }
          } catch (FormatException ignored) {
            throw new IllegalArgumentException("Illegal contents");
          }
          break;
        default:
          throw new IllegalArgumentException(
              "Requested contents should be 12 or 13 digits long, but got " + length);
      }
  
      checkNumeric(contents);
  
      int firstDigit = Character.digit(contents.charAt(0), 10);
      int parities = EAN13Reader.FIRST_DIGIT_ENCODINGS[firstDigit];
      boolean[] result = new boolean[CODE_WIDTH];
      int pos = 0;
  
      pos += appendPattern(result, pos, UPCEANReader.START_END_PATTERN, true);
  
      // See EAN13Reader for a description of how the first digit & left bars are encoded
      for (int i = 1; i <= 6; i++) {
        int digit = Character.digit(contents.charAt(i), 10);
        if ((parities >> (6 - i) & 1) == 1) {
          digit += 10;
        }
        pos += appendPattern(result, pos, UPCEANReader.L_AND_G_PATTERNS[digit], false);
      }
  
      pos += appendPattern(result, pos, UPCEANReader.MIDDLE_PATTERN, false);
  
      for (int i = 7; i <= 12; i++) {
        int digit = Character.digit(contents.charAt(i), 10);
        pos += appendPattern(result, pos, UPCEANReader.L_PATTERNS[digit], true);
      }
      appendPattern(result, pos, UPCEANReader.START_END_PATTERN, true);
  
      return result;
    }
  
  }
  