01: /*
02: * @(#)ByteArrayTagOrder.java 1.16 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: /**
29: * ByteArrayTagOrder: a class for comparing two DER encodings by the
30: * order of their tags.
31: *
32: * @version 1.9 02/02/00
33: * @author D. N. Hoover
34: */package sun.security.util;
35:
36: import java.util.Comparator;
37:
38: public class ByteArrayTagOrder implements Comparator {
39:
40: /**
41: * Compare two byte arrays, by the order of their tags,
42: * as defined in ITU-T X.680, sec. 6.4. (First compare
43: * tag classes, then tag numbers, ignoring the constructivity bit.)
44: *
45: * @param obj1 first byte array to compare.
46: * @param obj2 second byte array to compare.
47: * @return negative number if obj1 < obj2, 0 if obj1 == obj2,
48: * positive number if obj1 > obj2.
49: *
50: * @exception <code>ClassCastException</code>
51: * if either argument is not a byte array.
52: */
53:
54: public final int compare(Object obj1, Object obj2) {
55:
56: byte[] bytes1 = (byte[]) obj1;
57: byte[] bytes2 = (byte[]) obj2;
58:
59: // tag order is same as byte order ignoring any difference in
60: // the constructivity bit (0x02)
61: return (bytes1[0] | 0x20) - (bytes2[0] | 0x20);
62: }
63:
64: }
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