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Java example source code file (AddressOps.java)

This example Java source code file (AddressOps.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

address, addressops

The AddressOps.java Java example source code

/*
 * 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);
  }
}

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