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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 Strategy86 implements Strategy {
30  
31  	private static final int[] multiplicatorsMethodA = new int[] { 0, 0, 0, 1,
32  			2, 1, 2, 1, 2 };
33  
34  	private static final int[] multiplicatorsMethodB = new int[] { 0, 0, 0, 7,
35  			6, 5, 4, 3, 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  		if (9 == accountCode.getDigitAtPos(2)) {
45  			return calculateException(accountCode);
46  		} else {
47  			CheckDigit cd = calculateMethodA(accountCode);
48  			if (!accountCode.matchesCheckDigit(cd)) {
49  				cd = calculateMethodB(accountCode);
50  			}
51  			return cd;
52  		}
53  
54  	}
55  
56  	private CheckDigit calculateMethodA(final AccountCode accountCode) {
57  
58  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
59  				multiplicatorsMethodA);
60  		int cd = Strategy00AlikeHelper.getCheckDigitFromSum(sum);
61  
62  		return new CheckDigit(9, cd);
63  	}
64  
65  	private CheckDigit calculateMethodB(final AccountCode accountCode) {
66  
67  		int sum = Strategy06AlikeHelper.calculateSum(accountCode,
68  				multiplicatorsMethodB);
69  		int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
70  
71  		return new CheckDigit(9, cd);
72  	}
73  
74  	private CheckDigit calculateException(final AccountCode accountCode) {
75  		Strategy s = new Strategy51();
76  		return s.calculateCheckDigit(null, accountCode);
77  	}
78  
79  }