Mercurial > hg > blitz_stable
annotate src/com/go/trove/util/MultiKey.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2000 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 import java.util.Arrays; |
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56 |
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57 /****************************************************************************** |
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58 * MultiKey allows arrays and arrays of arrays to be used as hashtable keys. |
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59 * Hashcode computation and equality tests will fully recurse into the array |
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60 * elements. MultiKey can be used in conjunction with {@link Depot} for |
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61 * caching against complex keys. |
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62 * |
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63 * @author Brian S O'Neill |
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64 * @version |
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/07/09 <!-- $--> |
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66 * @see Pair |
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67 */ |
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68 public class MultiKey implements java.io.Serializable { |
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69 /** |
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70 * Computes an object hashcode for any kind of object including null, |
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71 * arrays, and arrays of arrays. |
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72 */ |
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73 static int hashCode(Object obj) { |
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74 if (obj == null) { |
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75 return 0; |
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76 } |
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77 |
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78 Class clazz = obj.getClass(); |
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79 |
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80 if (!clazz.isArray()) { |
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81 return obj.hashCode(); |
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82 } |
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83 |
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84 // Compute hashcode of array. |
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85 |
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86 int hash = clazz.hashCode(); |
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87 |
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88 if (obj instanceof Object[]) { |
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89 Object[] array = (Object[])obj; |
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90 for (int i = array.length; --i >= 0; ) { |
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91 hash = hash * 31 + hashCode(array[i]); |
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92 } |
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93 } |
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94 else if (obj instanceof int[]) { |
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95 int[] array = (int[])obj; |
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96 for (int i = array.length; --i >= 0; ) { |
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97 hash = hash * 31 + array[i]; |
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98 } |
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99 } |
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100 else if (obj instanceof float[]) { |
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101 float[] array = (float[])obj; |
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102 for (int i = array.length; --i >= 0; ) { |
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103 hash = hash * 31 + Float.floatToIntBits(array[i]); |
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104 } |
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105 } |
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106 else if (obj instanceof long[]) { |
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107 long[] array = (long[])obj; |
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108 for (int i = array.length; --i >= 0; ) { |
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109 long value = array[i]; |
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110 hash = hash * 31 + (int)(value ^ value >>> 32); |
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111 } |
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112 } |
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113 else if (obj instanceof double[]) { |
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114 double[] array = (double[])obj; |
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115 for (int i = array.length; --i >= 0; ) { |
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116 long value = Double.doubleToLongBits(array[i]); |
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117 hash = hash * 31 + (int)(value ^ value >>> 32); |
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118 } |
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119 } |
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120 else if (obj instanceof byte[]) { |
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121 byte[] array = (byte[])obj; |
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122 for (int i = array.length; --i >= 0; ) { |
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123 hash = hash * 31 + array[i]; |
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124 } |
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125 } |
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126 else if (obj instanceof char[]) { |
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127 char[] array = (char[])obj; |
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128 for (int i = array.length; --i >= 0; ) { |
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129 hash = hash * 31 + array[i]; |
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130 } |
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131 } |
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132 else if (obj instanceof boolean[]) { |
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133 boolean[] array = (boolean[])obj; |
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134 for (int i = array.length; --i >= 0; ) { |
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135 hash = hash * 31 + (array[i] ? 1 : 0); |
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136 } |
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137 } |
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138 else if (obj instanceof short[]) { |
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139 short[] array = (short[])obj; |
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140 for (int i = array.length; --i >= 0; ) { |
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141 hash = hash * 31 + array[i]; |
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142 } |
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143 } |
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144 |
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145 return hash; |
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146 } |
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147 |
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148 /** |
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149 * Performans an object equality for any kind of objects including null, |
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150 * arrays, and arrays of arrays. |
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151 */ |
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152 static boolean equals(Object obj1, Object obj2) { |
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153 if (obj1 == obj2) { |
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154 return true; |
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155 } |
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156 else if (obj1 == null || obj2 == null) { |
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157 return false; |
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158 } |
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159 |
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160 Class clazz1 = obj1.getClass(); |
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161 |
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162 if (!(clazz1.isArray())) { |
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163 return obj1.equals(obj2); |
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164 } |
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165 |
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166 if (clazz1 != obj2.getClass()) { |
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167 return false; |
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168 } |
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169 |
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170 // Perform array equality test. |
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171 if (obj1 instanceof Object[]) { |
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172 // Don't use Arrays.equals for objects since it doesn't |
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173 // recurse into arrays of arrays. |
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174 Object[] array1 = (Object[])obj1; |
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175 Object[] array2 = (Object[])obj2; |
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176 |
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177 int i; |
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178 if ((i = array1.length) != array2.length) { |
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179 return false; |
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180 } |
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181 |
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182 while (--i >= 0) { |
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183 if (!equals(array1[i], array2[i])) { |
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184 return false; |
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185 } |
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186 } |
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187 |
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188 return true; |
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189 } |
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190 else if (obj1 instanceof int[]) { |
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191 return Arrays.equals((int[])obj1, (int[])obj2); |
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192 } |
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193 else if (obj1 instanceof float[]) { |
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194 return Arrays.equals((float[])obj1, (float[])obj2); |
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195 } |
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196 else if (obj1 instanceof long[]) { |
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197 return Arrays.equals((long[])obj1, (long[])obj2); |
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198 } |
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199 else if (obj1 instanceof double[]) { |
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200 return Arrays.equals((double[])obj1, (double[])obj2); |
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201 } |
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202 else if (obj1 instanceof byte[]) { |
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203 return Arrays.equals((byte[])obj1, (byte[])obj2); |
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204 } |
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205 else if (obj1 instanceof char[]) { |
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206 return Arrays.equals((char[])obj1, (char[])obj2); |
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207 } |
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208 else if (obj1 instanceof boolean[]) { |
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209 return Arrays.equals((boolean[])obj1, (boolean[])obj2); |
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210 } |
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211 else if (obj1 instanceof short[]) { |
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212 return Arrays.equals((short[])obj1, (short[])obj2); |
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213 } |
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214 else { |
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215 return obj1.equals(obj2); |
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216 } |
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217 } |
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218 |
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219 private final Object mComponent; |
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220 private final int mHash; |
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221 |
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222 /** |
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223 * Contruct a new MultiKey against a component which may be any kind of |
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224 * object including an array, or an array of arrays, or null. |
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225 */ |
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226 public MultiKey(Object component) { |
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227 mComponent = component; |
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228 mHash = MultiKey.hashCode(component); |
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229 } |
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230 |
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231 /** |
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232 * Returns the original component used to construct this MultiKey. |
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233 */ |
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234 public Object getComponent() { |
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235 return mComponent; |
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236 } |
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237 |
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238 public int hashCode() { |
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239 return mHash; |
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240 } |
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241 |
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242 public boolean equals(Object other) { |
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243 if (this == other) { |
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244 return true; |
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245 } |
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246 else if (other instanceof MultiKey) { |
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247 MultiKey key = (MultiKey)other; |
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248 return MultiKey.equals(mComponent, key.mComponent); |
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249 } |
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250 else { |
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251 return false; |
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252 } |
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253 } |
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254 |
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255 public String toString() { |
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256 StringBuffer buf = new StringBuffer(); |
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257 append(buf, mComponent); |
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258 return buf.toString(); |
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259 } |
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260 |
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261 private void append(StringBuffer buf, Object obj) { |
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262 if (obj == null) { |
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263 buf.append("null"); |
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264 return; |
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265 } |
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266 |
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267 if (!obj.getClass().isArray()) { |
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268 buf.append(obj); |
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269 return; |
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270 } |
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271 |
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272 buf.append('['); |
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273 |
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274 if (obj instanceof Object[]) { |
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275 Object[] array = (Object[])obj; |
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276 for (int i=0; i<array.length; i++) { |
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277 if (i > 0) { |
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278 buf.append(','); |
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279 } |
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280 append(buf, array[i]); |
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281 } |
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282 } |
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283 else if (obj instanceof int[]) { |
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284 int[] array = (int[])obj; |
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285 for (int i=0; i<array.length; i++) { |
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286 if (i > 0) { |
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287 buf.append(','); |
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288 } |
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289 buf.append(array[i]); |
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290 } |
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291 } |
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292 else if (obj instanceof float[]) { |
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293 float[] array = (float[])obj; |
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294 for (int i=0; i<array.length; i++) { |
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295 if (i > 0) { |
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296 buf.append(','); |
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297 } |
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298 buf.append(array[i]); |
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299 } |
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300 } |
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301 else if (obj instanceof long[]) { |
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302 long[] array = (long[])obj; |
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303 for (int i=0; i<array.length; i++) { |
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304 if (i > 0) { |
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305 buf.append(','); |
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306 } |
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307 buf.append(array[i]); |
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308 } |
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309 } |
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310 else if (obj instanceof double[]) { |
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311 double[] array = (double[])obj; |
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312 for (int i=0; i<array.length; i++) { |
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313 if (i > 0) { |
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314 buf.append(','); |
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315 } |
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316 buf.append(array[i]); |
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317 } |
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318 } |
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319 else if (obj instanceof byte[]) { |
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320 byte[] array = (byte[])obj; |
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321 for (int i=0; i<array.length; i++) { |
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322 if (i > 0) { |
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323 buf.append(','); |
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324 } |
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325 buf.append(array[i]); |
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326 } |
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327 } |
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328 else if (obj instanceof char[]) { |
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329 char[] array = (char[])obj; |
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330 for (int i=0; i<array.length; i++) { |
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331 if (i > 0) { |
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332 buf.append(','); |
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333 } |
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334 buf.append(array[i]); |
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335 } |
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336 } |
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337 else if (obj instanceof boolean[]) { |
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338 boolean[] array = (boolean[])obj; |
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339 for (int i=0; i<array.length; i++) { |
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340 if (i > 0) { |
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341 buf.append(','); |
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342 } |
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343 buf.append(array[i]); |
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344 } |
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345 } |
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346 else if (obj instanceof short[]) { |
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347 short[] array = (short[])obj; |
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348 for (int i=0; i<array.length; i++) { |
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349 if (i > 0) { |
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350 buf.append(','); |
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351 } |
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352 buf.append(array[i]); |
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353 } |
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354 } |
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355 else { |
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356 buf.append(obj); |
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357 } |
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358 |
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359 buf.append(']'); |
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360 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
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