Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/BitSetN.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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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 java.util.BitSet;
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22 import java.util.NoSuchElementException;
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23
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24 /**
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25 * a FixedBitSet implementation that is based on java.util.BitSet
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26 */
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27 public class BitSetN extends BitSet implements FixedBitSet {
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28
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29 class SetBitIterator implements IntIterator {
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30 int cur = 0;
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31 int nBits;
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32 int cardinality; // <2do> this should be lifted since it makes the iterator brittle
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33
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34 SetBitIterator (){
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35 cardinality = cardinality();
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36 }
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37
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38 @Override
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39 public void remove() {
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40 if (cur >0){
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41 clear(cur-1);
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42 }
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43 }
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44
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45 @Override
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46 public boolean hasNext() {
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47 return nBits < cardinality;
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48 }
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49
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50 @Override
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51 public int next() {
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52 if (nBits < cardinality){
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53 int idx = nextSetBit(cur);
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54 if (idx >= 0){
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55 nBits++;
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56 cur = idx+1;
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57 }
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58 return idx;
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59
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60 } else {
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61 throw new NoSuchElementException();
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62 }
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63 }
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64 }
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65
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66
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67 public BitSetN (int nBits){
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68 super(nBits);
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69 }
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70
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71 @Override
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72 public FixedBitSet clone() {
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73 return (FixedBitSet) super.clone();
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74 }
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75
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76 @Override
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77 public int capacity() {
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78 return size();
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79 }
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80
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81
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82 @Override
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83 public void hash (HashData hd){
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84 long[] data = toLongArray();
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85 for (int i=0; i<data.length; i++){
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86 hd.add(data[i]);
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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 //--- IntSet interface
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92 @Override
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93 public boolean add(int i) {
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94 if (get(i)) {
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95 return false;
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96 } else {
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97 set(i);
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98 return true;
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99 }
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100 }
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101
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102 @Override
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103 public boolean remove(int i) {
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104 if (get(i)) {
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105 clear(i);
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106 return true;
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107 } else {
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108 return false;
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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 boolean contains(int i) {
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114 return get(i);
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115 }
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116
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117 @Override
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118 public IntIterator intIterator() {
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119 return new SetBitIterator();
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120 }
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121
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122 }