| /* |
| * Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code 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 code 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 in the LICENSE file that |
| * accompanied this code). |
| * |
| * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.utilities; |
| |
| import sun.jvm.hotspot.debugger.*; |
| |
| /** Helper class with operations on addresses. Solves the problem of |
| one or both of the arguments being null and needing to call |
| methods like greaterThan(), lessThan(), etc. on them. */ |
| |
| public class AddressOps { |
| /** Returns true if a1 is less than a2. Either or both may be null. */ |
| public static boolean lessThan(Address a1, Address a2) { |
| if (a2 == null) { |
| return false; |
| } else if (a1 == null) { |
| return true; |
| } else { |
| return a1.lessThan(a2); |
| } |
| } |
| |
| /** Returns true if a1 is less than or equal to a2. Either or both may be null. */ |
| public static boolean lessThanOrEqual(Address a1, Address a2) { |
| if (a2 == null) { |
| return (a1 == null); |
| } else if (a1 == null) { |
| return true; |
| } else { |
| return a1.lessThanOrEqual(a2); |
| } |
| } |
| |
| /** Returns true if a1 is greater than a2. Either or both may be null. */ |
| public static boolean greaterThan(Address a1, Address a2) { |
| if (a1 == null) { |
| return false; |
| } else if (a2 == null) { |
| return true; |
| } else { |
| return a1.greaterThan(a2); |
| } |
| } |
| |
| /** Returns true if a1 is greater than or equal to a2. Either or both may be null. */ |
| public static boolean greaterThanOrEqual(Address a1, Address a2) { |
| if (a1 == null) { |
| return (a2 == null); |
| } else if (a2 == null) { |
| return true; |
| } else { |
| return a1.greaterThanOrEqual(a2); |
| } |
| } |
| |
| /** Returns true if a1 is equal to a2. Either or both may be null. */ |
| public static boolean equal(Address a1, Address a2) { |
| if ((a1 == null) && (a2 == null)) { |
| return true; |
| } |
| |
| if ((a1 == null) || (a2 == null)) { |
| return false; |
| } |
| |
| return (a1.equals(a2)); |
| } |
| |
| /** Shorthand for {@link #lessThan} */ |
| public static boolean lt(Address a1, Address a2) { |
| return lessThan(a1, a2); |
| } |
| |
| /** Shorthand for {@link #lessThanOrEqual} */ |
| public static boolean lte(Address a1, Address a2) { |
| return lessThanOrEqual(a1, a2); |
| } |
| |
| /** Shorthand for {@link #greaterThan} */ |
| public static boolean gt(Address a1, Address a2) { |
| return greaterThan(a1, a2); |
| } |
| |
| /** Shorthand for {@link #greaterThanOrEqual} */ |
| public static boolean gte(Address a1, Address a2) { |
| return greaterThanOrEqual(a1, a2); |
| } |
| |
| /** Returns maximum of the two addresses */ |
| public static Address max(Address a1, Address a2) { |
| return (gt(a1, a2) ? a1 : a2); |
| } |
| |
| /** Returns minimum of the two addresses */ |
| public static Address min(Address a1, Address a2) { |
| return (lt(a1, a2) ? a1 : a2); |
| } |
| } |