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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.Strategy52AlikeHelper;
23  
24  /**
25   * @author ninan
26   * 
27   */
28  public class Strategy53 implements Strategy {
29  
30  	private static final int[] multiplicators = new int[] { 4, 2, 1, 6, 3, 7,
31  			9, 10, 5, 8, 4, 2 };
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  		if (9 == accountCode.getDigitAtPos(0)) {
41  			return new Strategy20().calculateCheckDigit(bankCode, accountCode);
42  		}
43  
44  		int offset = calculateOffset(bankCode, accountCode);
45  		int cdWeight = multiplicators[5 + offset];
46  		int[] legacyAccountNumber = buildEserLegacyAccountCode(bankCode,
47  				accountCode, offset);
48  
49  		int mod = Strategy52AlikeHelper.calculateSum(legacyAccountNumber,
50  				multiplicators);
51  
52  		return Strategy52AlikeHelper.getCheckSumFromMod(mod, cdWeight, 2);
53  
54  	}
55  
56  	private int calculateOffset(final BankCode bankCode,
57  			final AccountCode accountCode) {
58  
59  		int offset = 0;
60  		for (int i = 0; i < 6; ++i) {
61  			if (0 != accountCode.getDigitAtPos(i + 5)) {
62  				offset = i;
63  				break;
64  			}
65  		}
66  		return offset;
67  	}
68  
69  	private int[] buildEserLegacyAccountCode(final BankCode bankCode,
70  			final AccountCode accountCode, final int offset) {
71  
72  		int[] elac = new int[12];
73  
74  		elac[0 + offset] = bankCode.getDigitAtPos(4);
75  		elac[1 + offset] = bankCode.getDigitAtPos(5);
76  		elac[2 + offset] = accountCode.getDigitAtPos(2);
77  		elac[3 + offset] = bankCode.getDigitAtPos(7);
78  		elac[4 + offset] = accountCode.getDigitAtPos(1);
79  
80  		for (int i = offset; i < 6; ++i) {
81  			elac[i + 6] = accountCode.getDigitAtPos(4 + i);
82  		}
83  
84  		return elac;
85  
86  	}
87  }