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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.Strategy02AlikeHelper;
23  import net.sf.plausj.bank.german.strategy.util.Strategy06AlikeHelper;
24  
25  /**
26   * @author ninan
27   * 
28   */
29  public class Strategy85 implements Strategy {
30  
31  	private static final int[] multiplicatorsMethodA = new int[] { 0, 0, 0, 7,
32  			6, 5, 4, 3, 2, 0 };
33  
34  	private static final int[] multiplicatorsMethodBC = new int[] { 0, 0, 0, 0,
35  			6, 5, 4, 3, 2, 0 };
36  
37  	private static final int[] multiplicatorsException = new int[] { 0, 0, 8,
38  			7, 6, 5, 4, 3, 2, 0 };
39  
40  	/**
41  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
42  	 *      net.sf.plausj.bank.german.AccountCode)
43  	 */
44  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
45  			final AccountCode accountCode) {
46  		if (9 == accountCode.getDigitAtPos(2)
47  				&& 9 == accountCode.getDigitAtPos(3)) {
48  			int sum = Strategy02AlikeHelper.calculateSum(accountCode,
49  					multiplicatorsException);
50  			return Strategy02AlikeHelper.getCheckDigitFromSum(sum, 9);
51  		} else {
52  			int sum = Strategy06AlikeHelper.calculateSum(accountCode,
53  					multiplicatorsMethodA);
54  			int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
55  			CheckDigit cdObj = new CheckDigit(9, cd);
56  			if (!accountCode.matchesCheckDigit(cdObj)) {
57  				sum = Strategy06AlikeHelper.calculateSum(accountCode,
58  						multiplicatorsMethodBC);
59  				cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
60  				cdObj = new CheckDigit(9, cd);
61  				if (!accountCode.matchesCheckDigit(cdObj)) {
62  					if (7 == accountCode.getDigitAtPos(9)
63  							|| 8 == accountCode.getDigitAtPos(9)
64  							|| 9 == accountCode.getDigitAtPos(9)) {
65  						cdObj = new CheckDigit(CheckDigit.ALWAYS_INVALID, 0);
66  					} else {
67  						int mod = sum % 7;
68  						cd = mod == 0 ? 0 : 7 - mod;
69  						cdObj = new CheckDigit(9, cd);
70  					}
71  				}
72  			}
73  			return cdObj;
74  		}
75  	}
76  }