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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  
23  /**
24   * @author ninan
25   * 
26   */
27  public class Strategy31 implements Strategy {
28  
29  	private static final int[] multiplicators = new int[] { 1, 2, 3, 4, 5, 6,
30  			7, 8, 9 };
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  
39  		int sum = 0;
40  
41  		for (int i = AccountCode.ACCOUNT_CODE_MAX_LENGTH - 2; i >= 0; --i) {
42  
43  			sum += accountCode.getDigitAtPos(i) * multiplicators[i];
44  
45  		}
46  
47  		int mod = sum % 11;
48  
49  		if (mod == 10) {
50  			return new CheckDigit(CheckDigit.ALWAYS_INVALID, 0);
51  		} else {
52  			return new CheckDigit(9, mod);
53  		}
54  
55  	}
56  
57  }