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annotate graal/com.oracle.max.base/src/com/sun/max/collect/PoolSet64.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
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 import com.sun.max.lang.*;
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28
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29 /**
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30 * A compact and efficient implementation of a {@link PoolSet} for pools with 64 objects or less.
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31 *
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32 * 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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33 * {@linkplain PoolSet here}.
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34 */
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35 public class PoolSet64<T extends PoolObject> extends PoolSet<T> {
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36
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37 public static final int MAX_POOL_SIZE = 64;
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38
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39 /**
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40 * Bit vector representation of this set. The 2^k bit indicates the presence of _pool.get(k) in this set.
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41 */
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42 private long set;
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43
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44 /**
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45 * Creates an empty pool set for a pool with 64objects or less.
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46 */
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47 public PoolSet64(Pool<T> pool) {
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48 super(pool);
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49 assert pool.length() <= MAX_POOL_SIZE : pool.length() + " > " + MAX_POOL_SIZE;
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50 }
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51
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52 @Override
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53 public int size() {
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54 return Long.bitCount(set);
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55 }
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56
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57 @Override
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58 public void clear() {
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59 set = 0L;
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60 }
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61
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62 @Override
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63 public boolean isEmpty() {
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64 return set == 0L;
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65 }
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66
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67 private static int bitToSerial(long bit) {
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68 assert bit != 0 && Longs.isPowerOfTwoOrZero(bit);
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69 return Long.numberOfTrailingZeros(bit);
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70 }
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71
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72 private static long serialToBit(int serial) {
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73 assert serial >= 0 && serial < MAX_POOL_SIZE;
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74 return 1L << serial;
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75 }
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76
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77 @Override
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78 public boolean contains(T value) {
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79 if (value == null) {
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80 return false;
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81 }
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82
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83 final int serial = value.serial();
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84 assert pool.get(serial) == value;
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85 return (serialToBit(serial) & set) != 0;
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86 }
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87
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88 @Override
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89 public void add(T value) {
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90 final int serial = value.serial();
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91 assert pool.get(serial) == value;
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92 set |= serialToBit(serial);
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93 }
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94
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95 @Override
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96 public PoolSet64<T> addAll() {
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97 final int poolLength = pool.length();
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98 if (poolLength != 0) {
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99 final long highestBit = 1L << poolLength - 1;
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100 set = highestBit | (highestBit - 1);
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101 assert size() == poolLength;
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102 }
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103 return this;
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104 }
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105
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106 @Override
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107 public void or(PoolSet<T> others) {
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108 if (others instanceof PoolSet64) {
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109 final PoolSet64 poolSet64 = (PoolSet64) others;
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110 set |= poolSet64.set;
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111 } else {
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112 if (!others.isEmpty()) {
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113 for (T element : others) {
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114 add(element);
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115 }
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116 }
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117 }
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118 }
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119
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120 @Override
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121 public boolean remove(T value) {
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122 if (!isEmpty()) {
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123 final int serial = value.serial();
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124 assert pool.get(serial) == value;
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125 final long bit = serialToBit(serial);
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126 final boolean present = (set & bit) != 0;
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127 set &= ~bit;
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128 return present;
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129 }
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130 return false;
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131 }
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132
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133 @Override
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134 public T removeOne() {
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135 if (isEmpty()) {
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136 throw new NoSuchElementException();
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137 }
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138 final long bit = Long.lowestOneBit(set);
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139 set &= ~bit;
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140 return pool.get(bitToSerial(bit));
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141 }
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142
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143 @Override
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144 public void and(PoolSet<T> others) {
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145 if (others instanceof PoolSet64) {
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146 final PoolSet64 poolSet64 = (PoolSet64) others;
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147 set &= poolSet64.set;
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148 } else {
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149 long oldSet = this.set;
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150 while (oldSet != 0) {
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151 final long bit = Long.lowestOneBit(oldSet);
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152 final int serial = bitToSerial(bit);
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153 oldSet &= ~bit;
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154 if (!others.contains(pool.get(serial))) {
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155 this.set &= ~bit;
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156 }
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157 }
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158 }
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159 }
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160
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161 @Override
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162 public boolean containsAll(PoolSet<T> others) {
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163 if (others instanceof PoolSet64) {
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164 final PoolSet64 poolSet64 = (PoolSet64) others;
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165 return (set & poolSet64.set) == poolSet64.set;
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166 }
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167 return super.containsAll(others);
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168 }
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169
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170 @Override
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171 public PoolSet<T> clone() {
4142
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172 final PoolSet64<T> clone = new PoolSet64<>(pool);
3733
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173 clone.set = set;
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174 return clone;
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175 }
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176
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177 /**
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178 * Gets an iterator over all the values in this set.
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179 */
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180 public Iterator<T> iterator() {
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181 return new Iterator<T>() {
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182
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183 private long current = set;
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184 private long currentBit = -1L;
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185 public boolean hasNext() {
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186 return current != 0;
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187 }
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188
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189 public T next() {
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190 if (!hasNext()) {
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191 throw new NoSuchElementException();
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192 }
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193
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194 currentBit = Long.lowestOneBit(current);
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195 final int serial = bitToSerial(currentBit);
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196 current &= ~currentBit;
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197 return pool.get(serial);
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198 }
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199
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200 public void remove() {
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parents:
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201 if (currentBit == -1L) {
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parents:
diff changeset
202 throw new IllegalStateException();
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parents:
diff changeset
203 }
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diff changeset
204
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parents:
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205 set &= ~currentBit;
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parents:
diff changeset
206 currentBit = -1;
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parents:
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207 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
208 };
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parents:
diff changeset
209 }
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parents:
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210 }