1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22package proguard.util;
23
24/**
25 * This class contains utility methods operating on objects.
26 */
27public class ObjectUtil
28{
29    /**
30     * Returns whether the given objects are the same.
31     * @param object1 the first object, may be null.
32     * @param object2 the second object, may be null.
33     * @return whether the objects are the same.
34     */
35    public static boolean equal(Object object1, Object object2)
36    {
37        return object1 == null ?
38            object2 == null :
39            object1.equals(object2);
40    }
41
42
43    /**
44     * Returns the hash code of the given object, or 0 if it is null.
45     * @param object the object, may be null.
46     * @return the hash code.
47     */
48    public static int hashCode(Object object)
49    {
50        return object == null ? 0 : object.hashCode();
51    }
52
53
54    /**
55     * Returns a comparison of the two given objects.
56     * @param object1 the first object, may be null.
57     * @param object2 the second object, may be null.
58     * @return -1, 0, or 1.
59     * @see Comparable#compareTo(Object)
60     */
61    public static int compare(Comparable object1, Comparable object2)
62    {
63        return object1 == null ?
64            object2 == null ? 0 : -1 :
65            object2 == null ? 1 : object1.compareTo(object2);
66    }
67}
68