Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/utilities/AddressOps.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 } |