/*
* @(#)ByteArrayTagOrder.java 1.16 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
/**
* ByteArrayTagOrder: a class for comparing two DER encodings by the
* order of their tags.
*
* @version 1.9 02/02/00
* @author D. N. Hoover
*/
package sun.security.util;
import java.util.Comparator;
public class ByteArrayTagOrder implements Comparator {
/**
* Compare two byte arrays, by the order of their tags,
* as defined in ITU-T X.680, sec. 6.4. (First compare
* tag classes, then tag numbers, ignoring the constructivity bit.)
*
* @param obj1 first byte array to compare.
* @param obj2 second byte array to compare.
* @return negative number if obj1 < obj2, 0 if obj1 == obj2,
* positive number if obj1 > obj2.
*
* @exception <code>ClassCastException</code>
* if either argument is not a byte array.
*/
public final int compare(Object obj1, Object obj2) {
byte[] bytes1 = (byte[]) obj1;
byte[] bytes2 = (byte[]) obj2;
// tag order is same as byte order ignoring any difference in
// the constructivity bit (0x02)
return (bytes1[0] | 0x20) - (bytes2[0] | 0x20);
}
}