Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/Pair.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 /******************************************************************************
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56 * Simple object for pairing two objects together for use as a hash or tree
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57 * key.
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58 *
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59 * @author Brian S O'Neill
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60 * @version
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61 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/07/09 <!-- $-->
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62 * @see MultiKey
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63 */
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64 public class Pair implements Comparable, java.io.Serializable {
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65 private final Object mObj1;
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66 private final Object mObj2;
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67
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68 public Pair(Object obj1, Object obj2) {
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69 mObj1 = obj1;
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70 mObj2 = obj2;
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71 }
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72
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73 public int compareTo(Object obj) {
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74 if (this == obj) {
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75 return 0;
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76 }
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77
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78 Pair other = (Pair)obj;
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79
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80 Object a = mObj1;
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81 Object b = other.mObj1;
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82
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83 firstTest: {
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84 if (a == null) {
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85 if (b != null) {
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86 return 1;
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87 }
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88 // Both a and b are null.
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89 break firstTest;
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90 }
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91 else {
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92 if (b == null) {
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93 return -1;
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94 }
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95 }
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96
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97 int result = ((Comparable)a).compareTo(b);
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98
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99 if (result != 0) {
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100 return result;
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101 }
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102 }
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103
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104 a = mObj2;
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105 b = other.mObj2;
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106
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107 if (a == null) {
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108 if (b != null) {
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109 return 1;
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110 }
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111 // Both a and b are null.
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112 return 0;
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113 }
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114 else {
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115 if (b == null) {
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116 return -1;
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117 }
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118 }
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119
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120 return ((Comparable)a).compareTo(b);
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121 }
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122
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123 public boolean equals(Object obj) {
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124 if (this == obj) {
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125 return true;
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126 }
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127
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128 if (!(obj instanceof Pair)) {
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129 return false;
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130 }
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131
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132 Pair key = (Pair)obj;
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133
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134 return
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135 (mObj1 == null ?
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136 key.mObj1 == null : mObj1.equals(key.mObj1)) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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137 (mObj2 == null ?
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138 key.mObj2 == null : mObj2.equals(key.mObj2));
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139 }
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140
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141 public int hashCode() {
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Dan Creswell <dan.creswell@gmail.com>
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142 return
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143 (mObj1 == null ? 0 : mObj1.hashCode()) +
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144 (mObj2 == null ? 0 : mObj2.hashCode());
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145 }
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Dan Creswell <dan.creswell@gmail.com>
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146
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147 public String toString() {
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148 return "[" + mObj1 + ':' + mObj2 + ']';
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149 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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150 }