Mercurial > hg > blitz_condensed
annotate src/com/go/trove/util/FlyweightSet.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 * FlyweightSet.java |
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3 * |
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4 * Copyright (c) 2000 Starwave Corporation. All Rights Reserved. |
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5 * |
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6 * Original author: Brian S O'Neill |
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7 * |
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8 * $Workfile:: FlyweightSet.java $ |
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9 * $Author: dan $ |
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10 * $Revision: 1.1 $ |
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11 * $Date: Mon, 13 Oct 2003 12:20:39 +0100 $ |
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12 */ |
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13 |
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14 package com.go.trove.util; |
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15 |
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16 import java.lang.ref.*; |
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17 import java.util.*; |
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18 |
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19 /****************************************************************************** |
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20 * A thread-safe Set that manages flyweights: sharable objects that are usually |
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21 * immutable. Call the {@link #get get} method for supplying the FlyweightSet |
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22 * with candidate flyweight instances. |
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23 * <p> |
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24 * Objects that do not customize the hashCode and equals methods don't make |
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25 * sense to use as flyweights because each instance will be considered unique. |
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26 * The object returned from the {@link #get get} method will always be the same |
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27 * as the one passed in. |
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28 * |
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29 * @author Brian S O'Neill |
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30 * @version |
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31 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/18 <!-- $--> |
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32 * @see Utils#intern |
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33 */ |
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34 public class FlyweightSet extends AbstractSet { |
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35 // This implementation is basically a stripped down version of |
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36 // IdentityMap in which the entries contain only a referenced key and |
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37 // no value. |
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38 |
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39 private Entry mTable[]; |
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40 private int mCount; |
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41 private int mThreshold; |
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42 private float mLoadFactor; |
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43 |
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44 public FlyweightSet() { |
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45 final int initialCapacity = 101; |
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46 final float loadFactor = 0.75f; |
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47 mLoadFactor = loadFactor; |
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48 mTable = new Entry[initialCapacity]; |
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49 mThreshold = (int)(initialCapacity * loadFactor); |
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50 } |
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51 |
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52 /** |
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53 * Pass in a candidate flyweight object and get a unique instance from this |
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54 * set. The returned object will always be of the same type as that passed |
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55 * in. If the object passed in does not equal any object currently in the |
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56 * set, it will be added to the set, becoming a flyweight. |
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57 * |
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58 * @param obj candidate flyweight; null is also accepted |
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59 */ |
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60 public synchronized Object put(Object obj) { |
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61 // This implementation is based on the IdentityMap.put method. |
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62 |
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63 if (obj == null) { |
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64 return null; |
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65 } |
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66 |
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67 Entry tab[] = mTable; |
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68 int hash = hashCode(obj); |
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69 int index = (hash & 0x7FFFFFFF) % tab.length; |
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70 |
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71 for (Entry e = tab[index], prev = null; e != null; e = e.mNext) { |
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72 Object iobj = e.get(); |
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73 if (iobj == null) { |
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74 // Clean up after a cleared Reference. |
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75 if (prev != null) { |
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76 prev.mNext = e.mNext; |
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77 } |
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78 else { |
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79 tab[index] = e.mNext; |
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80 } |
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81 mCount--; |
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82 } |
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83 else if (e.mHash == hash && |
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84 obj.getClass() == iobj.getClass() && |
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85 equals(obj, iobj)) { |
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86 // Found flyweight instance. |
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87 return iobj; |
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88 } |
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89 else { |
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90 prev = e; |
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91 } |
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92 } |
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93 |
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94 if (mCount >= mThreshold) { |
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95 // Cleanup the table if the threshold is exceeded. |
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96 cleanup(); |
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97 } |
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98 |
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99 if (mCount >= mThreshold) { |
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100 // Rehash the table if the threshold is still exceeded. |
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101 rehash(); |
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102 tab = mTable; |
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103 index = (hash & 0x7FFFFFFF) % tab.length; |
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104 } |
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105 |
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106 // Create a new entry. |
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107 tab[index] = new Entry(obj, hash, tab[index]); |
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108 mCount++; |
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109 return obj; |
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110 } |
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111 |
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112 public Iterator iterator() { |
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113 return new SetIterator(); |
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114 } |
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115 |
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116 public int size() { |
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117 return mCount; |
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118 } |
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119 |
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120 public boolean contains(Object obj) { |
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121 if (obj == null) { |
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122 return false; |
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123 } |
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124 |
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125 Entry tab[] = mTable; |
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126 int hash = hashCode(obj); |
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127 int index = (hash & 0x7FFFFFFF) % tab.length; |
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128 |
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129 for (Entry e = tab[index], prev = null; e != null; e = e.mNext) { |
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130 Object iobj = e.get(); |
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131 if (iobj == null) { |
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132 // Clean up after a cleared Reference. |
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133 if (prev != null) { |
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134 prev.mNext = e.mNext; |
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135 } |
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136 else { |
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137 tab[index] = e.mNext; |
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138 } |
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139 mCount--; |
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140 } |
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141 else if (e.mHash == hash && |
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142 obj.getClass() == iobj.getClass() && |
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143 equals(obj, iobj)) { |
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144 // Found flyweight instance. |
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145 return true; |
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146 } |
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147 else { |
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148 prev = e; |
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149 } |
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150 } |
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151 |
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152 return false; |
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153 } |
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154 |
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155 public String toString() { |
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156 return IdentityMap.toString(this); |
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157 } |
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158 |
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159 protected int hashCode(Object obj) { |
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160 return obj.hashCode(); |
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161 } |
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162 |
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163 protected boolean equals(Object a, Object b) { |
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164 return a.equals(b); |
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165 } |
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166 |
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167 private void cleanup() { |
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168 Entry tab[] = mTable; |
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169 for (int i = tab.length; i-- > 0; ) { |
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170 for (Entry e = tab[i], prev = null; e != null; e = e.mNext) { |
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171 if (e.get() == null) { |
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172 // Clean up after a cleared Reference. |
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173 if (prev != null) { |
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174 prev.mNext = e.mNext; |
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175 } |
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176 else { |
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177 tab[i] = e.mNext; |
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178 } |
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179 mCount--; |
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180 } |
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181 else { |
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182 prev = e; |
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183 } |
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184 } |
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185 } |
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186 } |
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187 |
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188 private void rehash() { |
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189 int oldCapacity = mTable.length; |
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190 Entry[] tab = mTable; |
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191 |
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192 int newCapacity = oldCapacity * 2 + 1; |
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193 Entry[] newTab = new Entry[newCapacity]; |
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194 |
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195 mThreshold = (int)(newCapacity * mLoadFactor); |
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196 mTable = newTab; |
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197 |
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198 for (int i = oldCapacity; i-- > 0; ) { |
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199 for (Entry old = tab[i]; old != null; ) { |
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200 Entry e = old; |
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201 old = old.mNext; |
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202 |
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203 // Only copy entry if it hasn't been cleared. |
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204 if (e.get() == null) { |
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205 mCount--; |
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206 } |
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207 else { |
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208 int index = (e.mHash & 0x7FFFFFFF) % newCapacity; |
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209 e.mNext = newTab[index]; |
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210 newTab[index] = e; |
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211 } |
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212 } |
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213 } |
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214 } |
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215 |
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216 private static class Entry extends WeakReference { |
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217 int mHash; |
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218 Entry mNext; |
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219 |
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220 Entry(Object flyweight, int hash, Entry next) { |
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221 super(flyweight); |
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222 mHash = hash; |
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223 mNext = next; |
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224 } |
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225 } |
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226 |
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227 private class SetIterator implements Iterator { |
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228 private Entry[] mTable = FlyweightSet.this.mTable; |
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229 private int mIndex = mTable.length; |
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230 private Entry mEntry; |
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231 // To ensure that the iterator doesn't return cleared entries, keep a |
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232 // hard reference to the flyweight. Its existence will prevent the weak |
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233 // reference from being cleared. |
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234 private Object mEntryFlyweight; |
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235 private Entry mLastReturned; |
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236 |
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237 public boolean hasNext() { |
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238 while (mEntry == null || |
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239 (mEntryFlyweight = mEntry.get()) == null) { |
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240 if (mEntry != null) { |
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241 // Skip past a cleared Reference. |
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242 mEntry = mEntry.mNext; |
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243 } |
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244 else { |
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245 if (mIndex <= 0) { |
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246 return false; |
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247 } |
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248 else { |
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249 mEntry = mTable[--mIndex]; |
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250 } |
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251 } |
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252 } |
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253 |
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254 return true; |
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255 } |
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256 |
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257 public Object next() { |
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258 if (!hasNext()) { |
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259 throw new NoSuchElementException(); |
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260 } |
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261 |
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262 mEntry = mEntry.mNext; |
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263 return mEntryFlyweight; |
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264 } |
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265 |
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266 public void remove() { |
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267 throw new UnsupportedOperationException(); |
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268 } |
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269 } |
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270 } |