Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/BitSet64.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package gov.nasa.jpf.util;
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20
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21 /**
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22 *
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23 */
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24 public class BitSet64 extends AbstractFixedBitSet implements Cloneable {
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25
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26 static final int INDEX_MASK = 0xffffffc0; // ( i>=0 && i<64)
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27
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28 long l0;
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29
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30 public BitSet64 (){
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31 // nothing in here
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32 }
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33
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34 public BitSet64 (int i){
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35 set(i);
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36 }
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37
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38 public BitSet64 (int... idx){
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39 for (int i : idx){
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40 set(i);
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41 }
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42 }
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43
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44 @Override
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45 public void hash (HashData hd){
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46 hd.add(l0);
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47 }
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48
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49
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50 private final int computeCardinality (){
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51 return Long.bitCount(l0);
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52 }
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53
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54 //--- public interface (much like java.util.BitSet)
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55
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56 @Override
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57 public void set (int i){
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58 if ((i & INDEX_MASK) == 0){
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59 long bitPattern = (1L << i);
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60 if ((l0 & bitPattern) == 0L) {
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61 cardinality++;
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62 l0 |= bitPattern;
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63 }
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64 } else {
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65 throw new IndexOutOfBoundsException("BitSet64 index out of range: " + i);
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66 }
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67 }
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68
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69 @Override
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70 public void clear (int i){
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71 if ((i & INDEX_MASK) == 0){
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72 long bitPattern = (1L << i);
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73 if ((l0 & bitPattern) != 0L) { // bit is set
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74 cardinality--;
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75 l0 &= ~bitPattern;
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76 }
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77 } else {
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78 throw new IndexOutOfBoundsException("BitSet64 index out of range: " + i);
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79 }
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80 }
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81
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82
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83 @Override
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84 public boolean get (int i){
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85 if ((i & INDEX_MASK) == 0){
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86 long bitPattern = (1L << i);
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87 return ((l0 & bitPattern) != 0);
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88 } else {
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89 throw new IndexOutOfBoundsException("BitSet64 index out of range: " + i);
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90 }
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91 }
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92
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93 @Override
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94 public int capacity(){
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95 return 64;
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96 }
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97
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98 /**
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99 * number of bits we can store
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100 */
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101 @Override
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102 public int size() {
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103 return 64;
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104 }
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105
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106 /**
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107 * index of highest set bit + 1
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108 */
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109 @Override
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110 public int length() {
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111 return 64 - Long.numberOfLeadingZeros(l0);
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112 }
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113
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114
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115 @Override
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116 public void clear() {
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117 l0 = 0L;
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118 cardinality = 0;
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119 }
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120
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121 @Override
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122 public int nextSetBit (int fromIdx){
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123 if ((fromIdx & INDEX_MASK) == 0){
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124 //int n = Long.numberOfTrailingZeros(l0 & (0xffffffffffffffffL << fromIdx));
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125 int n = Long.numberOfTrailingZeros(l0 >> fromIdx) + fromIdx;
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126 if (n < 64) {
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127 return n;
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128 } else {
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129 return -1;
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130 }
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131 } else {
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132 //throw new IndexOutOfBoundsException("BitSet64 index out of range: " + fromIdx);
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133 return -1;
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134 }
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135 }
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136
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137 @Override
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138 public int nextClearBit (int fromIdx){
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139 if ((fromIdx & INDEX_MASK) == 0){
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140 //int n = Long.numberOfTrailingZeros(~l0 & (0xffffffffffffffffL << fromIdx));
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141 int n = Long.numberOfTrailingZeros(~l0 >> fromIdx) + fromIdx;
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142 if (n < 64) {
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143 return n;
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144 } else {
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145 return -1;
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146 }
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147 } else {
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148 //throw new IndexOutOfBoundsException("BitSet64 index out of range: " + fromIdx);
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149 return -1;
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150 }
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151 }
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152
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153 public void and (BitSet64 other){
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154 l0 &= other.l0;
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155
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156 cardinality = computeCardinality();
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157 }
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158
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159 public void andNot (BitSet64 other){
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160 l0 &= ~other.l0;
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161
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162 cardinality = computeCardinality();
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163 }
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164
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165 public void or (BitSet64 other){
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166 l0 |= other.l0;
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167
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168 cardinality = computeCardinality();
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169 }
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170
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171 @Override
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172 public boolean equals (Object o){
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173 if (o instanceof BitSet64){
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174 BitSet64 other = (BitSet64)o;
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175 if (l0 != other.l0) return false;
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176 return true;
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177 } else {
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178 // <2do> we could compare to a normal java.util.BitSet here
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179 return false;
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180 }
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181 }
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182
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183
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184 /**
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185 * answer the same hashCodes as java.util.BitSet
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186 */
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187 @Override
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188 public int hashCode() {
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189 long hc = 1234;
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190 hc ^= l0;
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191 return (int) ((hc >>32) ^ hc);
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192 }
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193
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194 }