Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/utilities/AddressOps.java @ 554:78144dc3db03
Merge
author | never |
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date | Tue, 13 Jan 2009 14:02:19 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.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); } }