Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/Utils.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) 1997-2000 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.*;
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56 import java.io.Serializable;
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57 import java.io.ObjectStreamException;
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58 import java.lang.reflect.InvocationTargetException;
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59 import java.lang.reflect.Method;
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60 import java.lang.ref.Reference;
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61 import java.lang.ref.WeakReference;
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62
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63 /******************************************************************************
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64 * Some generic utilities.
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65 *
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66 * @author Brian S O'Neill
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67 * @version
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68 * <!--$$Revision:--> 28 <!-- $-->, <!--$$JustDate:--> 00/12/18 <!-- $-->
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69 * @see java.util.Collections
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70 */
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71 public class Utils {
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72 // The choice of determining whether these constants are public or
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73 // private is based on the design of the java.util.Collections class.
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74 // For consistency, the "empty" fields are public, and the comparators are
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75 // accessed from static methods.
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76
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77 public static final Enumeration EMPTY_ENUMERATION = new EmptyEnum();
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78
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79 /** This Map is already provided in JDK1.3. */
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80 public static final Map EMPTY_MAP = new EmptyMap();
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81
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82 /**
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83 * Similar to EMPTY_MAP, except the put operation is supported, but the
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84 * values are immediately forgotten.
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85 */
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86 public static final Map VOID_MAP = new VoidMap();
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87
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88 private static final Comparator NULL_LOW_ORDER = new NullLowOrder();
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89
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90 private static final Comparator NULL_HIGH_ORDER = new NullHighOrder();
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91
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92 private static final Comparator NULL_EQUAL_ORDER = new NullEqualOrder();
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93
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94 private static FlyweightSet cFlyweightSet;
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95
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96 /**
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97 * Returns a Comparator that uses a Comparable object's natural ordering,
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98 * except null values are always considered low order. This Comparator
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99 * allows naturally ordered TreeMaps to support null values.
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100 */
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101 public static Comparator nullLowOrder() {
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102 return NULL_LOW_ORDER;
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103 }
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104
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105 /**
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106 * Returns a Comparator that wraps the given Comparator except null values
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107 * are always considered low order. This fixes Comparators that don't
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108 * support comparisons against null and allows them to be used in TreeMaps.
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109 */
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110 public static Comparator nullLowOrder(Comparator c) {
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111 return new NullLowOrderC(c);
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112 }
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113
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114 /**
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115 * Returns a Comparator that uses a Comparable object's natural ordering,
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116 * except null values are always considered high order. This Comparator
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117 * allows naturally ordered TreeMaps to support null values.
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118 */
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119 public static Comparator nullHighOrder() {
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120 return NULL_HIGH_ORDER;
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121 }
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122
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123 /**
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124 * Returns a Comparator that wraps the given Comparator except null values
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125 * are always considered high order. This fixes Comparators that don't
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126 * support comparisons against null and allows them to be used in TreeMaps.
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127 */
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128 public static Comparator nullHighOrder(Comparator c) {
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129 return new NullHighOrderC(c);
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130 }
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131
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132 /**
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133 * Returns a Comparator that uses a Comparable object's natural ordering,
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134 * except null values are always considered equal order. This Comparator
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135 * should not be used in a TreeMap, but can be used in a sorter.
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136 */
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137 public static Comparator nullEqualOrder() {
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138 return NULL_EQUAL_ORDER;
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139 }
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140
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141 /**
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142 * Returns a Comparator that wraps the given Comparator except null values
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143 * are always considered equal order. This Comparator should not be used in
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144 * a TreeMap, but can be used in a sorter.
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145 */
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146 public static Comparator nullEqualOrder(Comparator c) {
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147 return new NullEqualOrderC(c);
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148 }
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149
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150 /**
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151 * Returns a Comparator that wraps the given Comparator, but orders in
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152 * reverse.
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153 */
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154 public static Comparator reverseOrder(Comparator c) {
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155 return new ReverseOrderC(c);
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156 }
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157
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158 /**
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159 * Just like {@link String#intern() String.intern}, except it generates
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160 * flyweights for any kind of object, and it does not prevent them from
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161 * being garbage collected. Calling intern on a String does not use the
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162 * same String pool used by String.intern because those Strings are not
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163 * always garbage collected. Some virtual machines free up Strings from the
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164 * interned String pool, others do not.
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165 * <p>
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166 * For objects that do not customize the hashCode and equals methods,
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167 * calling intern is not very useful because the object returned will
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168 * always be the same as the one passed in.
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169 * <p>
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170 * The object type returned from intern is guaranteed to be exactly the
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171 * same type as the one passed in. Calling intern on null returns null.
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172 *
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173 * @param obj Object to intern
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174 * @return Interned object.
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175 * @see FlyweightSet
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176 */
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177 public static Object intern(Object obj) {
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178 FlyweightSet set;
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179 if ((set = cFlyweightSet) == null) {
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180 synchronized (Utils.class) {
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181 if ((set = cFlyweightSet) == null) {
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182 set = new FlyweightSet();
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183 }
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184 }
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185 cFlyweightSet = set;
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186 }
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187 return set.put(obj);
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188 }
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189
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190 protected Utils() {
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191 }
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192
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193 private static class EmptyEnum implements Enumeration, Serializable {
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194 public boolean hasMoreElements() {
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195 return false;
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196 }
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197
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198 public Object nextElement() throws NoSuchElementException {
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199 throw new NoSuchElementException();
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200 }
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201
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202 // Serializable singleton classes should always do this.
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203 private Object readResolve() throws ObjectStreamException {
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204 return EMPTY_ENUMERATION;
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205 }
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206 };
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207
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208 private static class EmptyMap implements Map, Serializable {
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209 public int size() {
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210 return 0;
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211 }
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212
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213 public boolean isEmpty() {
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214 return true;
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215 }
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216
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217 public boolean containsKey(Object key) {
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218 return false;
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219 }
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220
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221 public boolean containsValue(Object value) {
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222 return false;
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223 }
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224
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225 public Object get(Object key) {
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226 return null;
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227 }
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228
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229 public Object put(Object key, Object value) {
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230 throw new UnsupportedOperationException
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231 ("Cannot put into immutable empty map");
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232 }
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233
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234 public Object remove(Object key) {
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235 return null;
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236 }
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237
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238 public void putAll(Map map) {
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239 throw new UnsupportedOperationException
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240 ("Cannot put into immutable empty map");
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241 }
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242
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243 public void clear() {
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244 }
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245
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246 public Set keySet() {
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247 return Collections.EMPTY_SET;
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248 }
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249
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250 public Collection values() {
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251 return Collections.EMPTY_LIST;
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252 }
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253
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254 public Set entrySet() {
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255 return Collections.EMPTY_SET;
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256 }
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257
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258 // Serializable singleton classes should always do this.
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259 private Object readResolve() throws ObjectStreamException {
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260 return EMPTY_MAP;
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261 }
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262 }
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263
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264 private static class VoidMap extends EmptyMap {
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265 public Object put(Object key, Object value) {
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266 return null;
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267 }
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268
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269 public void putAll(Map map) {
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270 }
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271
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272 // Serializable singleton classes should always do this.
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273 private Object readResolve() throws ObjectStreamException {
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274 return VOID_MAP;
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275 }
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276 }
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277
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278 private static class NullLowOrder implements Comparator, Serializable {
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279 public int compare(Object obj1, Object obj2) {
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280 if (obj1 != null) {
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281 return (obj2 != null) ? ((Comparable)obj1).compareTo(obj2) : 1;
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282 }
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283 else {
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284 return (obj2 != null) ? -1 : 0;
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285 }
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286 }
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287
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288 // Serializable singleton classes should always do this.
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289 private Object readResolve() throws ObjectStreamException {
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290 return NULL_LOW_ORDER;
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291 }
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292 }
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293
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294 private static class NullLowOrderC implements Comparator, Serializable {
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295 private Comparator c;
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296
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297 public NullLowOrderC(Comparator c) {
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298 this.c = c;
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299 }
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300
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301 public int compare(Object obj1, Object obj2) {
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302 if (obj1 != null) {
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303 return (obj2 != null) ? c.compare(obj1, obj2) : 1;
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304 }
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305 else {
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306 return (obj2 != null) ? -1 : 0;
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307 }
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308 }
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309 }
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310
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311 private static class NullHighOrder implements Comparator, Serializable {
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312 public int compare(Object obj1, Object obj2) {
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313 if (obj1 != null) {
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314 return (obj2 != null) ? ((Comparable)obj1).compareTo(obj2): -1;
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315 }
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316 else {
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317 return (obj2 != null) ? 1 : 0;
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318 }
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319 }
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320
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321 // Serializable singleton classes should always do this.
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322 private Object readResolve() throws ObjectStreamException {
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323 return NULL_HIGH_ORDER;
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324 }
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325 }
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326
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327 private static class NullHighOrderC implements Comparator, Serializable {
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328 private Comparator c;
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329
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330 public NullHighOrderC(Comparator c) {
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331 this.c = c;
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332 }
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333
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334 public int compare(Object obj1, Object obj2) {
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335 if (obj1 != null) {
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336 return (obj2 != null) ? c.compare(obj1, obj2) : -1;
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337 }
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338 else {
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339 return (obj2 != null) ? 1 : 0;
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340 }
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341 }
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342 }
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343
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344 private static class NullEqualOrder implements Comparator, Serializable {
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345 public int compare(Object obj1, Object obj2) {
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346 return (obj1 != null && obj2 != null) ?
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347 ((Comparable)obj1).compareTo(obj2) : 0;
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348 }
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349
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350 // Serializable singleton classes should always do this.
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351 private Object readResolve() throws ObjectStreamException {
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352 return NULL_EQUAL_ORDER;
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353 }
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354 }
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355
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356 private static class NullEqualOrderC implements Comparator, Serializable {
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357 private Comparator c;
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358
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359 public NullEqualOrderC(Comparator c) {
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360 this.c = c;
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361 }
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362
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363 public int compare(Object obj1, Object obj2) {
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364 return (obj1 != null && obj2 != null) ? c.compare(obj1, obj2) : 0;
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365 }
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366 }
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367
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368 private static class ReverseOrderC implements Comparator, Serializable {
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369 private Comparator c;
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370
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371 public ReverseOrderC(Comparator c) {
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372 this.c = c;
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373 }
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374
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375 public int compare(Object obj1, Object obj2) {
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376 return c.compare(obj2, obj1);
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377 }
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378 }
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379 }