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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.Strategy06AlikeHelper;
23  
24  /**
25   * @author ninan
26   * 
27   */
28  public class StrategyA4 implements Strategy {
29  
30  	private static final int[] multiplicatorsA = new int[] { 0, 0, 0, 7, 6, 5,
31  			4, 3, 2 };
32  
33  	private static final int[] multiplicatorsB = new int[] { 0, 0, 0, 7, 6, 5,
34  			4, 3, 2 };
35  
36  	private static final int[] multiplicatorsC = new int[] { 0, 0, 0, 0, 6, 5,
37  			4, 3, 2 };
38  
39  	/**
40  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
41  	 *      net.sf.plausj.bank.german.AccountCode)
42  	 */
43  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
44  			final AccountCode accountCode) {
45  
46  		CheckDigit cd = null;
47  
48  		if (9 == accountCode.getDigitAtPos(2)
49  				&& 9 == accountCode.getDigitAtPos(3)) {
50  			cd = calculateCheckDigitMethodC(accountCode);
51  			if (!accountCode.matchesCheckDigit(cd)) {
52  				cd = calculateCheckDigitMethodD(accountCode);
53  			}
54  		} else {
55  			cd = calculateCheckDigitMethodA(accountCode);
56  			if (!accountCode.matchesCheckDigit(cd)) {
57  				cd = calculateCheckDigitMethodB(accountCode);
58  				if (!accountCode.matchesCheckDigit(cd)) {
59  					cd = calculateCheckDigitMethodD(accountCode);
60  				}
61  			}
62  		}
63  
64  		return cd;
65  
66  	}
67  
68  	private CheckDigit calculateCheckDigitMethodA(AccountCode accountCode) {
69  
70  		int sum = Strategy06AlikeHelper.calculateSum(accountCode,
71  				multiplicatorsA);
72  		int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
73  
74  		return new CheckDigit(9, cd);
75  	}
76  
77  	private CheckDigit calculateCheckDigitMethodB(AccountCode accountCode) {
78  
79  		int sum = Strategy06AlikeHelper.calculateSum(accountCode,
80  				multiplicatorsB);
81  		int mod = sum % 7;
82  		int cd = mod == 0 ? 0 : 7 - mod;
83  
84  		return new CheckDigit(9, cd);
85  
86  	}
87  
88  	private CheckDigit calculateCheckDigitMethodC(AccountCode accountCode) {
89  
90  		int sum = Strategy06AlikeHelper.calculateSum(accountCode,
91  				multiplicatorsC);
92  		int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
93  
94  		return new CheckDigit(9, cd);
95  
96  	}
97  
98  	private CheckDigit calculateCheckDigitMethodD(AccountCode accountCode) {
99  		return new Strategy93().calculateCheckDigit(null, accountCode);
100 	}
101 
102 }