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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 StrategyC0 implements Strategy {
28  
29  	private static final Strategy S20 = new Strategy20();
30  
31  	private static final Strategy S52 = new Strategy52();
32  
33  	/**
34  	 * @see net.sf.plausj.bank.german.strategy.Strategy#calculateCheckDigit(net.sf.plausj.bank.german.BankCode,
35  	 *      net.sf.plausj.bank.german.AccountCode)
36  	 */
37  	public CheckDigit calculateCheckDigit(final BankCode bankCode,
38  			final AccountCode accountCode) {
39  
40  		CheckDigit cd = null;
41  
42  		if (0 == accountCode.getDigitAtPos(0)
43  				&& 0 == accountCode.getDigitAtPos(1)) {
44  			cd = methodOne(bankCode, accountCode);
45  			if (!accountCode.matchesCheckDigit(cd)) {
46  				cd = methodTwo(bankCode, accountCode);
47  			}
48  		} else {
49  			cd = methodTwo(bankCode, accountCode);
50  		}
51  
52  		return cd;
53  
54  	}
55  
56  	private CheckDigit methodOne(BankCode bankCode, AccountCode accountCode) {
57  		CheckDigit cd = S52.calculateCheckDigit(bankCode, accountCode);
58  		return cd = new CheckDigit(3, cd.getDigit());
59  	}
60  
61  	private CheckDigit methodTwo(BankCode bankCode, AccountCode accountCode) {
62  		return S20.calculateCheckDigit(bankCode, accountCode);
63  	}
64  
65  }