author | jjg |
Mon, 20 May 2019 10:57:57 -0700 | |
changeset 54950 | 46ae54c3026d |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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package sun.jvm.hotspot.utilities; |
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import sun.jvm.hotspot.debugger.*; |
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/** Helper class with operations on addresses. Solves the problem of |
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one or both of the arguments being null and needing to call |
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methods like greaterThan(), lessThan(), etc. on them. */ |
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public class AddressOps { |
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/** Returns true if a1 is less than a2. Either or both may be null. */ |
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public static boolean lessThan(Address a1, Address a2) { |
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if (a2 == null) { |
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return false; |
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} else if (a1 == null) { |
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return true; |
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} else { |
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return a1.lessThan(a2); |
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} |
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} |
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/** Returns true if a1 is less than or equal to a2. Either or both may be null. */ |
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public static boolean lessThanOrEqual(Address a1, Address a2) { |
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if (a2 == null) { |
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return (a1 == null); |
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} else if (a1 == null) { |
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return true; |
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} else { |
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return a1.lessThanOrEqual(a2); |
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} |
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} |
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/** Returns true if a1 is greater than a2. Either or both may be null. */ |
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public static boolean greaterThan(Address a1, Address a2) { |
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if (a1 == null) { |
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return false; |
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} else if (a2 == null) { |
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return true; |
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} else { |
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return a1.greaterThan(a2); |
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} |
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} |
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/** Returns true if a1 is greater than or equal to a2. Either or both may be null. */ |
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public static boolean greaterThanOrEqual(Address a1, Address a2) { |
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if (a1 == null) { |
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return (a2 == null); |
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} else if (a2 == null) { |
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return true; |
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} else { |
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return a1.greaterThanOrEqual(a2); |
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} |
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} |
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/** Returns true if a1 is equal to a2. Either or both may be null. */ |
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public static boolean equal(Address a1, Address a2) { |
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if ((a1 == null) && (a2 == null)) { |
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return true; |
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} |
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if ((a1 == null) || (a2 == null)) { |
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return false; |
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} |
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return (a1.equals(a2)); |
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} |
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/** Shorthand for {@link #lessThan} */ |
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public static boolean lt(Address a1, Address a2) { |
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return lessThan(a1, a2); |
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} |
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/** Shorthand for {@link #lessThanOrEqual} */ |
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public static boolean lte(Address a1, Address a2) { |
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return lessThanOrEqual(a1, a2); |
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} |
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/** Shorthand for {@link #greaterThan} */ |
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public static boolean gt(Address a1, Address a2) { |
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return greaterThan(a1, a2); |
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} |
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/** Shorthand for {@link #greaterThanOrEqual} */ |
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public static boolean gte(Address a1, Address a2) { |
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return greaterThanOrEqual(a1, a2); |
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} |
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/** Returns maximum of the two addresses */ |
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public static Address max(Address a1, Address a2) { |
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return (gt(a1, a2) ? a1 : a2); |
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} |
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/** Returns minimum of the two addresses */ |
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public static Address min(Address a1, Address a2) { |
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return (lt(a1, a2) ? a1 : a2); |
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} |
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} |