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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 Strategy68 implements Strategy {
29  
30  	private static final int[] multiplicatorsTen = new int[] { 0, 0, 0, 1, 2,
31  			1, 2, 1, 2 };
32  
33  	private static final int[] multiplicatorsOne = new int[] { 0, 1, 2, 1, 2,
34  			1, 2, 1, 2 };
35  
36  	private static final int[] multiplicatorsTwo = new int[] { 0, 1, 0, 0, 2,
37  			1, 2, 1, 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  		if (0 == accountCode.getDigitAtPos(0)
47  				&& 4 == accountCode.getDigitAtPos(1)) {
48  			return null;
49  		}
50  
51  		if (accountCode.getDigitAtPos(0) > 0) {
52  			if (accountCode.getDigitAtPos(3) != 9) {
53  				return new CheckDigit(CheckDigit.ALWAYS_INVALID, 0);
54  			}
55  
56  			return calculateCheckDigit(accountCode, multiplicatorsTen);
57  		}
58  
59  		CheckDigit cd = calculateCheckDigit(accountCode, multiplicatorsOne);
60  		if (!accountCode.matchesCheckDigit(cd)) {
61  			cd = calculateCheckDigit(accountCode, multiplicatorsTwo);
62  		}
63  
64  		return cd;
65  
66  	}
67  
68  	private CheckDigit calculateCheckDigit(AccountCode accountCode,
69  			int[] multiplicators) {
70  
71  		int sum = Strategy00AlikeHelper.calculateSum(accountCode,
72  				multiplicators);
73  		int cd = Strategy00AlikeHelper.getCheckDigitFromSum(sum);
74  
75  		return new CheckDigit(9, cd);
76  
77  	}
78  
79  }