Class | Line # | Actions | |||||
---|---|---|---|---|---|---|---|
ElementComparator | 29 | 4 | 0% | 3 | 2 |
1 | /* | |
2 | * See the NOTICE file distributed with this work for additional | |
3 | * information regarding copyright ownership. | |
4 | * | |
5 | * This is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU Lesser General Public License as | |
7 | * published by the Free Software Foundation; either version 2.1 of | |
8 | * the License, or (at your option) any later version. | |
9 | * | |
10 | * This software is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this software; if not, write to the Free | |
17 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
18 | * 02110-1301 USA, or see the FSF site: http://www.fsf.org. | |
19 | */ | |
20 | package com.xpn.xwiki.objects; | |
21 | ||
22 | import java.util.Comparator; | |
23 | ||
24 | import org.apache.commons.collections4.ComparatorUtils; | |
25 | ||
26 | /** | |
27 | * Compare and sort instances of ElementInterface by name. | |
28 | */ | |
29 | public class ElementComparator implements Comparator | |
30 | { | |
31 | /** | |
32 | * Compares two objects (that implement ElementInterface) by name according to the rules for the compare method. | |
33 | * | |
34 | * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) | |
35 | */ | |
36 | 1531999 | @Override |
37 | public int compare(Object o1, Object o2) | |
38 | { | |
39 | // Get a null comparator that is backed by a static "natural" comparator | |
40 | 1531999 | Comparator c = ComparatorUtils.nullLowComparator(null); |
41 | ||
42 | // convert o1 and o2 into the string names when not null | |
43 | 1531999 | Object no1 = (o1 == null) ? null : ((ElementInterface) o1).getName(); |
44 | 1531999 | Object no2 = (o2 == null) ? null : ((ElementInterface) o2).getName(); |
45 | ||
46 | // let the null comparator handle possible null values, where null < non-null string | |
47 | 1531999 | return c.compare(no1, no2); |
48 | } | |
49 | } |