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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.util.MathHelper;
23  
24  /**
25   * @author ninan
26   * 
27   */
28  public class Strategy69 implements Strategy {
29  
30  	private static final int[] tblIndex = new int[] { 0, 3, 2, 1, 0, 3, 2, 1, 0 };
31  
32  	private static final int[][] table = new int[][] {
33  			{ 0, 1, 5, 9, 3, 7, 4, 8, 2, 6 }, { 0, 1, 7, 6, 9, 8, 3, 2, 5, 4 },
34  			{ 0, 1, 8, 4, 6, 2, 9, 5, 7, 3 }, { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 } };
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(0)) {
44  			if (3 == accountCode.getDigitAtPos(1)) {
45  				return null;
46  			} else if (7 == accountCode.getDigitAtPos(1)) {
47  				return calculateVariantTwo(accountCode);
48  			}
49  		}
50  
51  		CheckDigit cd = calculateVariantOne(accountCode);
52  
53  		if (!accountCode.matchesCheckDigit(cd)) {
54  			cd = calculateVariantTwo(accountCode);
55  		}
56  
57  		return cd;
58  
59  	}
60  
61  	private CheckDigit calculateVariantOne(AccountCode accountCode) {
62  		Strategy s = new Strategy28();
63  		CheckDigit cd = s.calculateCheckDigit(null, accountCode);
64  		return cd;
65  	}
66  
67  	private CheckDigit calculateVariantTwo(AccountCode accountCode) {
68  
69  		int sum = 0;
70  
71  		for (int i = AccountCode.ACCOUNT_CODE_MAX_LENGTH - 2; i >= 0; --i) {
72  			int idx = tblIndex[i];
73  			sum += table[idx][accountCode.getDigitAtPos(i)];
74  		}
75  
76  		int ld = MathHelper.getLastDigits(sum, 1);
77  		int cd = 10 - ld;
78  
79  		return new CheckDigit(9, cd);
80  	}
81  }