Mercurial > hg > blitz_condensed
diff src/com/go/trove/util/Pair.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/util/Pair.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,150 @@ +/* ==================================================================== + * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group + * ==================================================================== + * The Tea Software License, Version 1.1 + * + * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Walt Disney Internet Group (http://opensource.go.com/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact opensource@dig.com. + * + * 5. Products derived from this software may not be called "Tea", + * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", + * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior + * written permission of the Walt Disney Internet Group. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * For more information about Tea, please see http://opensource.go.com/. + */ + +package com.go.trove.util; + +/****************************************************************************** + * Simple object for pairing two objects together for use as a hash or tree + * key. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/07/09 <!-- $--> + * @see MultiKey + */ +public class Pair implements Comparable, java.io.Serializable { + private final Object mObj1; + private final Object mObj2; + + public Pair(Object obj1, Object obj2) { + mObj1 = obj1; + mObj2 = obj2; + } + + public int compareTo(Object obj) { + if (this == obj) { + return 0; + } + + Pair other = (Pair)obj; + + Object a = mObj1; + Object b = other.mObj1; + + firstTest: { + if (a == null) { + if (b != null) { + return 1; + } + // Both a and b are null. + break firstTest; + } + else { + if (b == null) { + return -1; + } + } + + int result = ((Comparable)a).compareTo(b); + + if (result != 0) { + return result; + } + } + + a = mObj2; + b = other.mObj2; + + if (a == null) { + if (b != null) { + return 1; + } + // Both a and b are null. + return 0; + } + else { + if (b == null) { + return -1; + } + } + + return ((Comparable)a).compareTo(b); + } + + public boolean equals(Object obj) { + if (this == obj) { + return true; + } + + if (!(obj instanceof Pair)) { + return false; + } + + Pair key = (Pair)obj; + + return + (mObj1 == null ? + key.mObj1 == null : mObj1.equals(key.mObj1)) && + (mObj2 == null ? + key.mObj2 == null : mObj2.equals(key.mObj2)); + } + + public int hashCode() { + return + (mObj1 == null ? 0 : mObj1.hashCode()) + + (mObj2 == null ? 0 : mObj2.hashCode()); + } + + public String toString() { + return "[" + mObj1 + ':' + mObj2 + ']'; + } +}