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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  
24  /**
25   * @author ninan
26   * 
27   */
28  public class Strategy73 implements Strategy {
29  
30  	private static final int[] multiplicatorsOne = new int[] { 0, 0, 0, 1, 2,
31  			1, 2, 1, 2 };
32  
33  	private static final int[] multiplicatorsTwo = new int[] { 0, 0, 0, 0, 2,
34  			1, 2, 1, 2 };
35  
36  	/**
37  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
38  	 *      net.sf.plausj.bank.german.AccountCode)
39  	 */
40  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
41  			final AccountCode accountCode) {
42  
43  		if (9 == accountCode.getDigitAtPos(2)) {
44  			return exception(accountCode);
45  		}
46  
47  		CheckDigit cd = variantOne(accountCode);
48  		if (accountCode.matchesCheckDigit(cd)) {
49  			return cd;
50  		}
51  
52  		cd = variantTwo(accountCode);
53  		if (accountCode.matchesCheckDigit(cd)) {
54  			return cd;
55  		}
56  
57  		return variantThree(accountCode);
58  
59  	}
60  
61  	private CheckDigit variantOne(AccountCode accountCode) {
62  
63  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
64  				multiplicatorsOne);
65  		int cd = Strategy00AlikeHelper.getCheckDigitFromSum(sum);
66  
67  		return new CheckDigit(9, cd);
68  
69  	}
70  
71  	private CheckDigit variantTwo(AccountCode accountCode) {
72  
73  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
74  				multiplicatorsTwo);
75  		int cd = Strategy00AlikeHelper.getCheckDigitFromSum(sum);
76  
77  		return new CheckDigit(9, cd);
78  
79  	}
80  
81  	private CheckDigit variantThree(AccountCode accountCode) {
82  
83  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
84  				multiplicatorsTwo);
85  
86  		int mod = sum % 7;
87  		int cd = 7 - mod;
88  
89  		return new CheckDigit(9, cd);
90  
91  	}
92  
93  	private CheckDigit exception(AccountCode accountCode) {
94  		return new Strategy51().calculateCheckDigit(null, accountCode);
95  	}
96  
97  }