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1   /*
2    *  XNap Commons
3    *
4    *  Copyright (C) 2005  Steffen Pingel
5    *
6    *  This library is free software; you can redistribute it and/or
7    *  modify it under the terms of the GNU Lesser General Public
8    *  License as published by the Free Software Foundation; either
9    *  version 2.1 of the License, or (at your option) any later version.
10   *
11   *  This library is distributed in the hope that it will be useful,
12   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   *  Lesser General Public License for more details.
15   *
16   *  You should have received a copy of the GNU Lesser General Public
17   *  License along with this library; if not, write to the Free Software
18   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19   */
20  package org.xnap.commons.settings;
21  
22  
23  /***
24   * Provides a setting for String objects.
25   */
26  public class EnumSetting<T extends Enum<T>> extends AbstractSetting<T> {
27  
28      private Class<T> clazz;
29  
30  	public EnumSetting(SettingResource backend, String key, T defaultValue)
31      {
32      	super(backend, key, defaultValue, null);
33  		
34  		if (getDefaultValue() == null) {
35  			throw new IllegalArgumentException("defaultValue may not be null");
36  		}
37  		clazz = defaultValue.getDeclaringClass();
38      }
39  	
40  	public EnumSetting(SettingResource backend, String key, Class<T> clazz)
41  	{
42  		super(backend, key, null, null);
43  		
44  		this.clazz = clazz;
45  	}
46  
47  	public Class<T> getEnumClass() {
48  		return clazz;
49  	}
50  	
51  	@Override
52  	protected T fromString(String value)
53  	{
54  		try {
55  			return T.valueOf(clazz, value);
56  		} catch (IllegalArgumentException e) {
57  			return null;
58  		}
59  	}
60  
61  	@Override
62  	protected String toString(T value)
63  	{
64  		return value.name();
65  	}
66  }