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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 Strategy63 implements Strategy {
29  
30  	private static final int[] multiplicators = new int[] { 0, 1, 2, 1, 2, 1, 2 };
31  
32  	/**
33  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
34  	 *      net.sf.plausj.bank.german.AccountCode)
35  	 */
36  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
37  			final AccountCode accountCode) {
38  		if (0 != accountCode.getDigitAtPos(0)) {
39  			return new CheckDigit(CheckDigit.ALWAYS_INVALID, 0);
40  		}
41  
42  		CheckDigit cd = calculateCheckDigit(accountCode);
43  		if (accountCode.matchesCheckDigit(cd)
44  				|| (0 == accountCode.getDigitAtPos(8) && 0 == accountCode
45  						.getDigitAtPos(9))) {
46  			return cd;
47  		}
48  
49  		AccountCode accountCodeFb = new AccountCode(accountCode
50  				.getAccountCode().substring(2, 10)
51  				+ "00");
52  		CheckDigit cdFb = calculateCheckDigit(accountCodeFb);
53  
54  		if (!accountCodeFb.matchesCheckDigit(cdFb)) {
55  			return cd;
56  		} else {
57  			return new CheckDigit(9, cdFb.getDigit());
58  		}
59  	}
60  
61  	private CheckDigit calculateCheckDigit(AccountCode accountCode) {
62  		int sum = 0;
63  		for (int i = 6; i > 0; --i) {
64  			int p = accountCode.getDigitAtPos(i) * multiplicators[i];
65  			while (p > 9) {
66  				p = MathHelper.calcCrossTotal(p);
67  			}
68  			sum += p;
69  		}
70  
71  		int ld = MathHelper.getLastDigits(sum, 1);
72  
73  		int cd = 0;
74  		if (ld > 0) {
75  			cd = 10 - ld;
76  		}
77  
78  		return new CheckDigit(7, cd);
79  	}
80  
81  }