Mercurial > hg > blitz_condensed
comparison 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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-1:000000000000 | 0:3dc0c5604566 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.util; | |
54 | |
55 /****************************************************************************** | |
56 * Simple object for pairing two objects together for use as a hash or tree | |
57 * key. | |
58 * | |
59 * @author Brian S O'Neill | |
60 * @version | |
61 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/07/09 <!-- $--> | |
62 * @see MultiKey | |
63 */ | |
64 public class Pair implements Comparable, java.io.Serializable { | |
65 private final Object mObj1; | |
66 private final Object mObj2; | |
67 | |
68 public Pair(Object obj1, Object obj2) { | |
69 mObj1 = obj1; | |
70 mObj2 = obj2; | |
71 } | |
72 | |
73 public int compareTo(Object obj) { | |
74 if (this == obj) { | |
75 return 0; | |
76 } | |
77 | |
78 Pair other = (Pair)obj; | |
79 | |
80 Object a = mObj1; | |
81 Object b = other.mObj1; | |
82 | |
83 firstTest: { | |
84 if (a == null) { | |
85 if (b != null) { | |
86 return 1; | |
87 } | |
88 // Both a and b are null. | |
89 break firstTest; | |
90 } | |
91 else { | |
92 if (b == null) { | |
93 return -1; | |
94 } | |
95 } | |
96 | |
97 int result = ((Comparable)a).compareTo(b); | |
98 | |
99 if (result != 0) { | |
100 return result; | |
101 } | |
102 } | |
103 | |
104 a = mObj2; | |
105 b = other.mObj2; | |
106 | |
107 if (a == null) { | |
108 if (b != null) { | |
109 return 1; | |
110 } | |
111 // Both a and b are null. | |
112 return 0; | |
113 } | |
114 else { | |
115 if (b == null) { | |
116 return -1; | |
117 } | |
118 } | |
119 | |
120 return ((Comparable)a).compareTo(b); | |
121 } | |
122 | |
123 public boolean equals(Object obj) { | |
124 if (this == obj) { | |
125 return true; | |
126 } | |
127 | |
128 if (!(obj instanceof Pair)) { | |
129 return false; | |
130 } | |
131 | |
132 Pair key = (Pair)obj; | |
133 | |
134 return | |
135 (mObj1 == null ? | |
136 key.mObj1 == null : mObj1.equals(key.mObj1)) && | |
137 (mObj2 == null ? | |
138 key.mObj2 == null : mObj2.equals(key.mObj2)); | |
139 } | |
140 | |
141 public int hashCode() { | |
142 return | |
143 (mObj1 == null ? 0 : mObj1.hashCode()) + | |
144 (mObj2 == null ? 0 : mObj2.hashCode()); | |
145 } | |
146 | |
147 public String toString() { | |
148 return "[" + mObj1 + ':' + mObj2 + ']'; | |
149 } | |
150 } |