Mercurial > hg > blitz_condensed
annotate 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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rev | line source |
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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)) && |
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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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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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146 |
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147 public String toString() { |
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148 return "[" + mObj1 + ':' + mObj2 + ']'; |
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149 } |
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150 } |