content: /*
   * Copyright 2011 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.EncodeHintType;
  import com.ailiwean.core.zxing.core.Writer;
  import com.ailiwean.core.zxing.core.WriterException;
  import com.ailiwean.core.zxing.core.common.BitMatrix;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.regex.Pattern;
  
  /**
   * <p>Encapsulates functionality and implementation that is common to one-dimensional barcodes.</p>
   *
   * @author dsbnatut@gmail.com (Kazuki Nishiura)
   */
  public abstract class OneDimensionalCodeWriter implements Writer {
    private static final Pattern NUMERIC = Pattern.compile("[0-9]+");
  
    @Override
    public final BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
        throws WriterException {
      return encode(contents, format, width, height, null);
    }
  
    /**
     * Encode the contents following specified format.
     * {@code width} and {@code height} are required size. This method may return bigger size
     * {@code BitMatrix} when specified size is too small. The user can set both {@code width} and
     * {@code height} to zero to get minimum size barcode. If negative value is set to {@code width}
     * or {@code height}, {@code IllegalArgumentException} is thrown.
     */
    @Override
    public BitMatrix encode(String contents,
                            BarcodeFormat format,
                            int width,
                            int height,
                            Map<EncodeHintType,?> hints) {
      if (contents.isEmpty()) {
        throw new IllegalArgumentException("Found empty contents");
      }
  
      if (width < 0 || height < 0) {
        throw new IllegalArgumentException("Negative size is not allowed. Input: "
                                               + width + 'x' + height);
      }
      Collection<BarcodeFormat> supportedFormats = getSupportedWriteFormats();
      if (supportedFormats != null && !supportedFormats.contains(format)) {
        throw new IllegalArgumentException("Can only encode " + supportedFormats +
          ", but got " + format);
      }
  
      int sidesMargin = getDefaultMargin();
      if (hints != null && hints.containsKey(EncodeHintType.MARGIN)) {
        sidesMargin = Integer.parseInt(hints.get(EncodeHintType.MARGIN).toString());
      }
  
      boolean[] code = encode(contents);
      return renderResult(code, width, height, sidesMargin);
    }
  
    protected Collection<BarcodeFormat> getSupportedWriteFormats() {
      return null;
    }
  
    /**
     * @return a byte array of horizontal pixels (0 = white, 1 = black)
     */
    private static BitMatrix renderResult(boolean[] code, int width, int height, int sidesMargin) {
      int inputWidth = code.length;
      // Add quiet zone on both sides.
      int fullWidth = inputWidth + sidesMargin;
      int outputWidth = Math.max(width, fullWidth);
      int outputHeight = Math.max(1, height);
  
      int multiple = outputWidth / fullWidth;
      int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
  
      BitMatrix output = new BitMatrix(outputWidth, outputHeight);
      for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
        if (code[inputX]) {
          output.setRegion(outputX, 0, multiple, outputHeight);
        }
      }
      return output;
    }
  
    /**
     * @param contents string to check for numeric characters
     * @throws IllegalArgumentException if input contains characters other than digits 0-9.
     */
    protected static void checkNumeric(String contents) {
      if (!NUMERIC.matcher(contents).matches()) {
        throw new IllegalArgumentException("Input should only contain digits 0-9");
      }
    }
  
    /**
     * @param target encode black/white pattern into this array
     * @param pos position to start encoding at in {@code target}
     * @param pattern lengths of black/white runs to encode
     * @param startColor starting color - false for white, true for black
     * @return the number of elements added to target.
     */
    protected static int appendPattern(boolean[] target, int pos, int[] pattern, boolean startColor) {
      boolean color = startColor;
      int numAdded = 0;
      for (int len : pattern) {
        for (int j = 0; j < len; j++) {
          target[pos++] = color;
        }
        numAdded += len;
        color = !color; // flip color after each segment
      }
      return numAdded;
    }
  
    public int getDefaultMargin() {
      // CodaBar spec requires a side margin to be more than ten times wider than narrow space.
      // This seems like a decent idea for a default for all formats.
      return 10;
    }
  
    /**
     * Encode the contents to boolean array expression of one-dimensional barcode.
     * Start code and end code should be included in result, and side margins should not be included.
     *
     * @param contents barcode contents to encode
     * @return a {@code boolean[]} of horizontal pixels (false = white, true = black)
     */
    public abstract boolean[] encode(String contents);
  }
  
  