Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/PoolBitSet.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
parents | bc8527f3071c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.collect; |
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24 |
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25 import java.util.*; |
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26 |
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27 /** |
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28 * An implementation of a {@link PoolSet} based on a {@link BitSet}. |
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29 * |
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30 * While it's possible to create an instance of this class directly, the preferred way to create a pool set is described |
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31 * {@linkplain PoolSet here}. |
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32 */ |
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33 public class PoolBitSet<T extends PoolObject> extends PoolSet<T> { |
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34 |
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35 private final BitSet set; |
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36 |
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37 /** |
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38 * Creates an empty pool bit set. |
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39 */ |
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40 public PoolBitSet(Pool<T> pool) { |
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41 super(pool); |
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42 set = new BitSet(pool.length()); |
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43 } |
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44 |
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45 /** |
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46 * Constructor to be used by subclasses for implementing {@link #clone()}. |
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47 */ |
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48 protected PoolBitSet(PoolBitSet<T> toBeCloned) { |
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49 super(toBeCloned.pool()); |
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50 set = (BitSet) toBeCloned.set.clone(); |
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51 } |
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52 |
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53 @Override |
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54 public boolean contains(T value) { |
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55 if (value == null) { |
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56 return false; |
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57 } |
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58 assert pool.get(value.serial()) == value; |
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59 return set.get(value.serial()); |
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60 } |
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61 |
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62 @Override |
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63 public int size() { |
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64 return set.cardinality(); |
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65 } |
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66 |
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67 @Override |
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68 public void clear() { |
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69 set.clear(); |
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70 } |
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71 |
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72 @Override |
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73 public boolean isEmpty() { |
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74 return set.isEmpty(); |
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75 } |
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76 |
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77 @Override |
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78 public void add(T value) { |
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79 assert pool.get(value.serial()) == value; |
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80 set.set(value.serial()); |
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81 } |
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82 |
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83 @Override |
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84 public PoolBitSet<T> addAll() { |
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85 set.set(0, pool.length()); |
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86 return this; |
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87 } |
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88 |
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89 @Override |
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90 public void or(PoolSet<T> others) { |
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91 if (others instanceof PoolBitSet) { |
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92 final PoolBitSet otherPoolBitSet = (PoolBitSet) others; |
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93 set.or(otherPoolBitSet.set); |
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94 } else { |
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95 for (T element : others) { |
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96 add(element); |
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97 } |
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98 } |
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99 } |
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100 |
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101 @Override |
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102 public boolean remove(T value) { |
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103 assert pool.get(value.serial()) == value; |
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104 final boolean present = set.get(value.serial()); |
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105 set.clear(value.serial()); |
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106 return present; |
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107 } |
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108 |
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109 @Override |
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110 public T removeOne() { |
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111 final int index = set.nextSetBit(0); |
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112 if (index < 0) { |
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113 throw new NoSuchElementException(); |
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114 } |
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115 set.clear(index); |
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116 return pool.get(index); |
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117 } |
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118 |
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119 @Override |
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120 public void and(PoolSet<T> others) { |
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121 if (others instanceof PoolBitSet) { |
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122 final PoolBitSet otherPoolBitSet = (PoolBitSet) others; |
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123 set.and(otherPoolBitSet.set); |
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124 } else { |
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125 for (int i = set.nextSetBit(0); i >= 0; i = set.nextSetBit(i + 1)) { |
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126 if (!others.contains(pool.get(i))) { |
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127 set.clear(i); |
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128 } |
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129 } |
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130 } |
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131 } |
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132 |
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133 @Override |
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134 public boolean containsAll(PoolSet<T> others) { |
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135 for (T value : others) { |
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136 if (!contains(value)) { |
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137 return false; |
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138 } |
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139 } |
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140 return true; |
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141 } |
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142 |
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143 @Override |
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144 public PoolSet<T> clone() { |
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145 return new PoolBitSet<>(this); |
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146 } |
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147 |
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148 /** |
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149 * Gets an iterator over all the values in this set. |
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150 */ |
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151 public Iterator<T> iterator() { |
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152 return new Iterator<T>() { |
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153 |
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154 private int currentBit = -1; |
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155 private int nextSetBit = set.nextSetBit(0); |
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156 |
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157 public boolean hasNext() { |
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158 return nextSetBit != -1; |
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159 } |
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160 |
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161 public T next() { |
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162 if (!hasNext()) { |
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163 throw new NoSuchElementException(); |
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164 } |
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165 |
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166 currentBit = nextSetBit; |
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167 nextSetBit = set.nextSetBit(nextSetBit + 1); |
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168 return pool.get(currentBit); |
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169 } |
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170 |
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171 public void remove() { |
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172 if (currentBit == -1) { |
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173 throw new IllegalStateException(); |
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174 } |
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175 set.clear(currentBit); |
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176 currentBit = -1; |
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177 } |
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178 }; |
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179 } |
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180 } |