1 /*
2 *
3 * Fosstrak LLRP Commander (www.fosstrak.org)
4 *
5 * Copyright (C) 2008 ETH Zurich
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>
19 *
20 */
21
22 package org.fosstrak.llrp.adaptor.util;
23
24 import java.util.Collections;
25 import java.util.Enumeration;
26 import java.util.Properties;
27 import java.util.Vector;
28
29 /**
30 * Extend the default properties to write a sorted configuration file.
31 * @author sawielan
32 *
33 */
34 public class SortedProperties extends Properties {
35
36 /** default serial id. */
37 private static final long serialVersionUID = 1520361645438527317L;
38
39 @Override
40 @SuppressWarnings("unchecked")
41 public synchronized Enumeration keys() {
42 Enumeration keysEnum = super.keys();
43 Vector keyList = new Vector();
44 while(keysEnum.hasMoreElements()){
45 keyList.add(keysEnum.nextElement());
46 }
47 Collections.sort(keyList);
48 return keyList.elements();
49 }
50 }