Mercurial > hg > Members > kono > jpf-core

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

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author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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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 import gov.nasa.jpf.JPFException;
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22 import java.util.NoSuchElementException;
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23
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24 /**
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25 * BitSet like interface for fixed size bit sets
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26 *
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27 * We keep this as an interface so that we can have java.util.BitSet
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28 * subclasses as implementations
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29 */
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30 public interface FixedBitSet extends Cloneable, IntSet {
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31
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32 void set (int i);
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33 void set (int i, boolean val);
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34 boolean get (int i);
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35 void clear (int i);
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36
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37 int nextClearBit (int fromIndex);
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38 int nextSetBit (int fromIndex);
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39
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40 boolean isEmpty();
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41 int size();
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42
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43 int cardinality();
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44 int length();
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45 int capacity();
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46
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47 void clear();
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48
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49 void hash (HashData hd);
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50
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51 FixedBitSet clone();
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52 }
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53
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54 /**
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55 * this is the base class for our non java.util.BitSet based FixedBitSet implementations
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56 */
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57 abstract class AbstractFixedBitSet implements FixedBitSet {
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58
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59 class SetBitIterator implements IntIterator {
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60 int cur = 0;
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61 int nBits;
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62
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63 @Override
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64 public void remove() {
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65 if (cur >0){
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66 clear(cur-1);
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67 }
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68 }
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69
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70 @Override
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71 public boolean hasNext() {
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72 return nBits < cardinality;
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73 }
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74
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75 @Override
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76 public int next() {
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77 if (nBits < cardinality){
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78 int idx = nextSetBit(cur);
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79 if (idx >= 0){
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80 nBits++;
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81 cur = idx+1;
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82 }
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83 return idx;
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84
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85 } else {
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86 throw new NoSuchElementException();
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87 }
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88 }
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89 }
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90
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91
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92 protected int cardinality;
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93
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94 @Override
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95 public AbstractFixedBitSet clone(){
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96 try {
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97 return (AbstractFixedBitSet) super.clone();
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98 } catch (CloneNotSupportedException ex) {
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99 throw new JPFException("BitSet64 clone failed");
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100 }
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101 }
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102
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103 @Override
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104 public void set (int i, boolean val){
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105 if (val) {
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106 set(i);
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107 } else {
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108 clear(i);
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109 }
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110 }
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111
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112 @Override
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113 public int cardinality() {
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114 return cardinality;
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115 }
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116
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117 @Override
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118 public boolean isEmpty() {
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119 return (cardinality == 0);
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120 }
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121
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122 @Override
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123 public String toString() {
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124 StringBuilder sb = new StringBuilder();
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125 sb.append('{');
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126
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127 boolean first = true;
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128 for (int i=nextSetBit(0); i>= 0; i = nextSetBit(i+1)){
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129 if (!first){
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130 sb.append(',');
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131 } else {
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132 first = false;
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133 }
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134 sb.append(i);
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135 }
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136
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137 sb.append('}');
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138
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139 return sb.toString();
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140 }
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141
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142 //--- IntSet interface
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143
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144
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145 @Override
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146 public boolean add(int i) {
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147 if (get(i)) {
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148 return false;
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149 } else {
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150 set(i);
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151 return true;
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152 }
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153 }
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154
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155 @Override
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156 public boolean remove(int i) {
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157 if (get(i)) {
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158 clear(i);
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159 return true;
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160 } else {
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161 return false;
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162 }
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163 }
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164
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165 @Override
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166 public boolean contains(int i) {
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167 return get(i);
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168 }
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169
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170 @Override
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171 public IntIterator intIterator() {
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172 return new SetBitIterator();
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173 }
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174
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175 }