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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.util.MathHelper;
23  
24  /**
25   * @author ninan
26   * 
27   */
28  public class Strategy22 implements Strategy {
29  
30  	private static final int[] multiplicators = new int[] { 3, 1, 3, 1, 3, 1,
31  			3, 1, 3 };
32  
33  	/**
34  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
35  	 *      net.sf.plausj.bank.german.AccountCode)
36  	 */
37  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
38  			final AccountCode accountCode) {
39  
40  		int sum = 0;
41  		for (int i = AccountCode.ACCOUNT_CODE_MAX_LENGTH - 2; i >= 0; --i) {
42  			int t = accountCode.getDigitAtPos(i) * multiplicators[i];
43  			if (t > 9) {
44  				t = MathHelper.getLastDigits(t, 1);
45  			}
46  			sum += t;
47  		}
48  		int ld = MathHelper.getLastDigits(sum, 1);
49  		int cd = 10 - ld;
50  		if (0 == ld) {
51  			cd = 0;
52  		}
53  
54  		return new CheckDigit(9, cd);
55  	}
56  
57  }