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1   /*
2    * Copyright 2006 Christian Kalkhoff <me@ninan.info>
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *         http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package net.sf.plausj.bank.german.strategy;
18  
19  import net.sf.plausj.bank.german.AccountCode;
20  import net.sf.plausj.bank.german.BankCode;
21  import net.sf.plausj.bank.german.CheckDigit;
22  import net.sf.plausj.bank.german.strategy.util.Strategy00AlikeHelper;
23  import net.sf.plausj.bank.german.util.MathHelper;
24  
25  /**
26   * @author ninan
27   * 
28   */
29  public class Strategy21 implements Strategy {
30  
31  	private static final int[] multiplicators = new int[] { 2, 1, 2, 1, 2, 1,
32  			2, 1, 2 };
33  
34  	/**
35  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
36  	 *      net.sf.plausj.bank.german.AccountCode)
37  	 */
38  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
39  			final AccountCode accountCode) {
40  
41  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
42  				multiplicators);
43  
44  		while (sum > 9) {
45  			sum = MathHelper.calcCrossTotal(sum);
46  		}
47  
48  		int cd = 10 - sum;
49  
50  		return new CheckDigit(9, cd);
51  
52  	}
53  
54  }