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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.strategy.util.Strategy06AlikeHelper;
24  
25  /**
26   * @author ninan
27   * 
28   */
29  public class StrategyA8 implements Strategy {
30  
31  	private static final int[] multiplicatorsA = new int[] { 0, 0, 0, 7, 6, 5,
32  			4, 3, 2 };
33  
34  	private static final int[] multiplicatorsB = new int[] { 0, 0, 0, 1, 2, 1,
35  			2, 1, 2 };
36  
37  	/**
38  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
39  	 *      net.sf.plausj.bank.german.AccountCode)
40  	 */
41  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
42  			final AccountCode accountCode) {
43  
44  		CheckDigit cd = null;
45  
46  		if (9 == accountCode.getDigitAtPos(2)) {
47  			cd = new Strategy51().calculateCheckDigit(bankCode, accountCode);
48  		} else {
49  			cd = calculateCheckDigitMethodA(accountCode);
50  			if (!accountCode.matchesCheckDigit(cd)) {
51  				cd = calculateCheckDigitMethodB(accountCode);
52  			}
53  		}
54  
55  		return cd;
56  
57  	}
58  
59  	private CheckDigit calculateCheckDigitMethodA(final AccountCode accountCode) {
60  
61  		int sum = Strategy06AlikeHelper.calculateSum(accountCode,
62  				multiplicatorsA);
63  		int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
64  
65  		return new CheckDigit(9, cd);
66  
67  	}
68  
69  	private CheckDigit calculateCheckDigitMethodB(final AccountCode accountCode) {
70  
71  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
72  				multiplicatorsB);
73  		int cd = Strategy00AlikeHelper.getCheckDigitFromSum(sum);
74  
75  		return new CheckDigit(9, cd);
76  
77  	}
78  
79  }