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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 Strategy17 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  
39  		int sum = 0;
40  		for (int i = 0; i < AccountCode.ACCOUNT_CODE_MAX_LENGTH - 3; ++i) {
41  			int t = accountCode.getDigitAtPos(i) * multiplicators[i];
42  			if (t >= 10 && i % 2 == 0) {
43  				t = MathHelper.calcCrossTotal(t);
44  			}
45  			sum += t;
46  		}
47  
48  		sum -= 1;
49  
50  		int mod = sum % 11;
51  
52  		int cd = 0;
53  		if (mod > 0) {
54  			cd = 10 - mod;
55  		}
56  
57  		return new CheckDigit(7, cd);
58  	}
59  
60  }