/**
 * @author Tomasz Lubinski
 * (c)2006 algorytm.org
 *
 *  Code 11 Bar Code
 */
public class BarCode {
	
	  private static final char code11signs[] = {
		  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-'};

	  private static final char code11bars[][] = {
	        {1, 0, 1, 0, 1, 1},
	        {1, 1, 0, 1, 0, 1, 1},
	        {1, 0, 0, 1, 0, 1, 1},
	        {1, 1, 0, 0, 1, 0, 1},
	        {1, 0, 1, 1, 0, 1, 1},
	        {1, 1, 0, 1, 1, 0, 1},
	        {1, 0, 0, 1, 1, 0, 1},
	        {1, 0, 1, 0, 0, 1, 1},
	        {1, 1, 0, 1, 0, 0, 1},
	        {1, 1, 0, 1, 0, 1},
	        {1, 0, 1, 1, 0, 1}
	  };

	  private static final char start_stop[] = {
		  1, 0, 1, 1, 0, 0, 1
	  };

	  public boolean check(String txt) {
	      for (int i=0; i<txt.length(); i++) {
              if (checkLetter(txt.charAt(i)) == false)
              		return false;
          }
		  return true;
	  }

	  private boolean checkLetter(char ch) {
	        for (int i=0; i<code11signs.length; i++) {
                if (code11signs[i] == ch)
                	return true;
	        }
	        return false;
	  }
	  
	  public char[] getBars(char ch) {
	        for (int i=0; i<code11signs.length; i++) {
                if (code11signs[i] == ch)
                	return code11bars[i];
	        }		  
		  return null;
	  }
	  
	  public char[] getStartStopBars() {
		  return start_stop;
	  }
	    
	  //returns letter value for check digit
	  private int getLetterValue(char ch) {
	          for (int i=0; i<code11signs.length; i++)
	                  if (code11signs[i] == ch)
	                          return i;

	          return 0;
	  }

	  // return check digit C
	  private int checkDigitC(String txt) {
		  
	        int sum = 0;
	        int w = 0;

	        for (int i=txt.length()-1; i>=0; i--)
	        {
	                sum += (getLetterValue(txt.charAt(i)) * ((w % 10) + 1));
	                w++;
	        }

	        return (sum % 11);
	  }	
	  
	  // return check digit K
	  private int checkDigitK(String txt) {
		  
	        int sum = 0;
	        int w = 0;

	        for (int i=txt.length()-1; i>=0; i--)
	        {
	                sum += (getLetterValue(txt.charAt(i)) * ((w % 9) + 1));
	                w++;
	        }

	        return (sum % 11);
	  }	  
	  
	  public char[] getCheckDigitBarsC(String txt) {
           	return code11bars[checkDigitC(txt)];
	  }	 
	  
	  public char[] getCheckDigitBarsK(String txt) {
         	return code11bars[checkDigitK(txt)];
	  }
	  
	  public char getCheckDigitC(String txt) {
		  return code11signs[checkDigitC(txt)];
	  }
	  
	  public char getCheckDigitK(String txt) {
		  return code11signs[checkDigitK(txt)];
	  }	  
}