01: /*
02: JSPWiki - a JSP-based WikiWiki clone.
03:
04: Copyright (C) 2001-2007 Janne Jalkanen (Janne.Jalkanen@iki.fi)
05:
06: This program is free software; you can redistribute it and/or modify
07: it under the terms of the GNU Lesser General Public License as published by
08: the Free Software Foundation; either version 2.1 of the License, or
09: (at your option) any later version.
10:
11: This program 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
14: GNU Lesser General Public License for more details.
15:
16: You should have received a copy of the GNU Lesser General Public License
17: along with this program; if not, write to the Free Software
18: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20: package com.ecyrd.jspwiki.auth;
21:
22: import java.io.Serializable;
23: import java.security.Principal;
24: import java.text.Collator;
25: import java.util.Comparator;
26:
27: /**
28: * Comparator class for sorting objects of type Principal.
29: * Used for sorting arrays or collections of Principals.
30: * @since 2.3
31: */
32: public class PrincipalComparator implements Comparator, Serializable {
33: private static final long serialVersionUID = 1L;
34:
35: /**
36: * Compares two Principal objects.
37: * @param o1 the first Principal
38: * @param o2 the second Principal
39: * @return the result of the comparison
40: * @see java.util.Comparator#compare(Object, Object)
41: */
42: public int compare(Object o1, Object o2) {
43: Collator collator = Collator.getInstance();
44: if (o1 instanceof Principal && o2 instanceof Principal) {
45: return collator.compare(((Principal) o1).getName(),
46: ((Principal) o2).getName());
47: }
48: throw new ClassCastException(
49: "Objects must be of type Principal.");
50: }
51:
52: }
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