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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.Strategy06AlikeHelper;
23  import net.sf.plausj.bank.german.util.MathHelper;
24  
25  /**
26   * @author ninan
27   * 
28   */
29  public class Strategy89 implements Strategy {
30  
31  	private static final int[] multiplicators = new int[] { 0, 0, 0, 7, 6, 5,
32  			4, 3, 2, 0 };
33  
34  	/**
35  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
36  	 *      net.sf.plausj.bank.german.AccountCode)
37  	 */
38  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
39  			final AccountCode accountCode) {
40  
41  		if (9 == accountCode.getRealLength()
42  				|| 8 == accountCode.getRealLength()) {
43  
44  			Strategy s = new Strategy10();
45  			return s.calculateCheckDigit(bankCode, accountCode);
46  
47  		} else if (7 == accountCode.getRealLength()) {
48  
49  			int sum = 0;
50  			for (int i = AccountCode.ACCOUNT_CODE_MAX_LENGTH - 1; i >= 0; --i) {
51  				int p = accountCode.getDigitAtPos(i) * multiplicators[i];
52  				while (p > 9) {
53  					p = MathHelper.calcCrossTotal(p);
54  				}
55  				sum += p;
56  			}
57  
58  			int cd = Strategy06AlikeHelper.getCheckDigitFromSum(sum);
59  			return new CheckDigit(9, cd);
60  
61  		} else {
62  			return new CheckDigit(CheckDigit.ALWAYS_INVALID, 0);
63  		}
64  
65  	}
66  }