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annotate graal/com.oracle.max.base/src/com/sun/max/collect/PoolBitSet.java @ 4184:fa6b78681c54

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Added copyright check to the gate.
author Doug Simon <doug.simon@oracle.com>
date Tue, 03 Jan 2012 12:37:31 +0100
parents bc8527f3071c
children
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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 }