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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/AddressOps.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities;
26
27 import sun.jvm.hotspot.debugger.*;
28
29 /** Helper class with operations on addresses. Solves the problem of
30 one or both of the arguments being null and needing to call
31 methods like greaterThan(), lessThan(), etc. on them. */
32
33 public class AddressOps {
34 /** Returns true if a1 is less than a2. Either or both may be null. */
35 public static boolean lessThan(Address a1, Address a2) {
36 if (a2 == null) {
37 return false;
38 } else if (a1 == null) {
39 return true;
40 } else {
41 return a1.lessThan(a2);
42 }
43 }
44
45 /** Returns true if a1 is less than or equal to a2. Either or both may be null. */
46 public static boolean lessThanOrEqual(Address a1, Address a2) {
47 if (a2 == null) {
48 return (a1 == null);
49 } else if (a1 == null) {
50 return true;
51 } else {
52 return a1.lessThanOrEqual(a2);
53 }
54 }
55
56 /** Returns true if a1 is greater than a2. Either or both may be null. */
57 public static boolean greaterThan(Address a1, Address a2) {
58 if (a1 == null) {
59 return false;
60 } else if (a2 == null) {
61 return true;
62 } else {
63 return a1.greaterThan(a2);
64 }
65 }
66
67 /** Returns true if a1 is greater than or equal to a2. Either or both may be null. */
68 public static boolean greaterThanOrEqual(Address a1, Address a2) {
69 if (a1 == null) {
70 return (a2 == null);
71 } else if (a2 == null) {
72 return true;
73 } else {
74 return a1.greaterThanOrEqual(a2);
75 }
76 }
77
78 /** Returns true if a1 is equal to a2. Either or both may be null. */
79 public static boolean equal(Address a1, Address a2) {
80 if ((a1 == null) && (a2 == null)) {
81 return true;
82 }
83
84 if ((a1 == null) || (a2 == null)) {
85 return false;
86 }
87
88 return (a1.equals(a2));
89 }
90
91 /** Shorthand for {@link #lessThan} */
92 public static boolean lt(Address a1, Address a2) {
93 return lessThan(a1, a2);
94 }
95
96 /** Shorthand for {@link #lessThanOrEqual} */
97 public static boolean lte(Address a1, Address a2) {
98 return lessThanOrEqual(a1, a2);
99 }
100
101 /** Shorthand for {@link #greaterThan} */
102 public static boolean gt(Address a1, Address a2) {
103 return greaterThan(a1, a2);
104 }
105
106 /** Shorthand for {@link #greaterThanOrEqual} */
107 public static boolean gte(Address a1, Address a2) {
108 return greaterThanOrEqual(a1, a2);
109 }
110
111 /** Returns maximum of the two addresses */
112 public static Address max(Address a1, Address a2) {
113 return (gt(a1, a2) ? a1 : a2);
114 }
115
116 /** Returns minimum of the two addresses */
117 public static Address min(Address a1, Address a2) {
118 return (lt(a1, a2) ? a1 : a2);
119 }
120 }