/*
* 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.
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*/
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} */
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