Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/choice/IntIntervalGenerator.java @ 34:49be04cc6389 default tip java9-try

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cyclic dependency ...
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 19 Dec 2017 11:21:23 +0900
parents fdc263e5806b
children
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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 package gov.nasa.jpf.vm.choice;
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19
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20 import gov.nasa.jpf.Config;
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21 import gov.nasa.jpf.JPFException;
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22 import gov.nasa.jpf.vm.ChoiceGenerator;
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23 import gov.nasa.jpf.vm.ChoiceGeneratorBase;
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24 import gov.nasa.jpf.vm.IntChoiceGenerator;
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25
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26 import java.util.Arrays;
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27 import java.util.Comparator;
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28
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29 /**
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30 * Choice Generator that enumerates an interval of int values. Pretty simplistic
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31 * implementation for now, but at least it can count up and down
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32 *
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33 * randomizing is handled through RandomOrderIntCG
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34 */
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35 public class IntIntervalGenerator extends ChoiceGeneratorBase<Integer> implements IntChoiceGenerator {
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36
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37 protected int min, max;
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38 protected int next;
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39 protected int delta;
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40
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41 @Override
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42 public void reset () {
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43 isDone = false;
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44
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45 if (delta == 0) {
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46 throw new JPFException("IntIntervalGenerator delta value is 0");
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47 }
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48
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49 if (min > max) {
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50 int t = max;
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51 max = min;
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52 min = t;
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53 }
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54
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55 if (delta > 0) {
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56 next = min - delta;
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57 } else {
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58 next = max - delta;
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59 }
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60 }
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61
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62 /**
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63 * don't use this since it is not safe for cascaded ChoiceGenerators
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64 * (we need the 'id' to be as context specific as possible)
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65 */
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66 @Deprecated public IntIntervalGenerator(int min, int max){
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67 this("?", min, max);
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68 }
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69
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70 @Deprecated public IntIntervalGenerator(int min, int max, int delta){
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71 this("?", min, max, delta);
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72 }
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73
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74 public IntIntervalGenerator(String id, int min, int max, int delta) {
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75 super(id);
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76
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77 this.min = min;
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78 this.max = max;
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79 this.delta = delta;
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80
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81 reset();
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82 }
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83
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84 public IntIntervalGenerator(String id, int min, int max) {
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85 this(id, min, max, 1);
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86 }
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87
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88 public IntIntervalGenerator(Config conf, String id) {
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89 super(id);
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90 min = conf.getInt(id + ".min");
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91 max = conf.getInt(id + ".max");
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92 delta = conf.getInt(id + ".delta", 1);
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93
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94 reset();
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95 }
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96
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97 @Override
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98 public Integer getChoice (int idx){
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99 int nChoices = getTotalNumberOfChoices();
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100 if (idx >= 0 && idx < nChoices){
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101 return min + idx*delta;
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102 } else {
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103 throw new IllegalArgumentException("choice index out of range: " + idx);
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104 }
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105 }
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106
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107 @Override
0
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108 public Integer getNextChoice () {
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109 return new Integer(next);
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110 }
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111
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112 @Override
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113 public boolean hasMoreChoices () {
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114 if (isDone) {
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115 return false;
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116 } else {
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117 if (delta > 0) {
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118 return (next < max);
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119 } else {
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120 return (next > min);
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121 }
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122 }
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123 }
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124
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125 @Override
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126 public void advance () {
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127 next += delta;
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128 }
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129
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130 @Override
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131 public int getTotalNumberOfChoices () {
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132 return Math.abs((max - min) / delta) + 1;
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133 }
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134
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135 @Override
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136 public int getProcessedNumberOfChoices () {
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137 if (delta > 0) {
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138 if (next < min){
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139 return 0;
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140 } else {
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141 return (Math.abs((next - min) / delta) + 1);
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142 }
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143 } else {
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144 if (next > max){
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145 return 0;
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146 } else {
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147 return (Math.abs((max - next) / delta) + 1);
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148 }
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149 }
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150 }
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151
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152 public boolean isAscending(){
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153 return delta > 0;
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154 }
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155
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156 /**
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157 * note this should only be called before the CG is advanced since it resets
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158 * the enumeration state
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159 */
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160 public void reverse(){
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161 delta = -delta;
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162 reset();
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163 }
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164
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165
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166 public Integer[] getChoices(){
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167 int n = getTotalNumberOfChoices();
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168 Integer[] vals = new Integer[n];
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169 int v = (delta > 0) ? min : max;
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170
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171 for (int i=0; i<n; i++){
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172 vals[i] = v;
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173 v += delta;
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174 }
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175
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176 return vals;
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177 }
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178
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179 @Override
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180 public boolean supportsReordering(){
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181 return true;
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182 }
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183
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184 @Override
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185 public ChoiceGenerator<Integer> reorder (Comparator<Integer> comparator){
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186 Integer[] vals = getChoices();
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187 Arrays.sort(vals, comparator);
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188
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189 return new IntChoiceFromList(id, vals);
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190 }
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191
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192 @Override
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193 public String toString () {
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194 StringBuilder sb = new StringBuilder(getClass().getName());
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195 sb.append("[id=\"");
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196 sb.append(id);
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197 sb.append('"');
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198
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199 sb.append(",isCascaded:");
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200 sb.append(isCascaded);
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201
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202 sb.append(",");
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203 sb.append(min);
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204 sb.append("..");
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205 sb.append(max);
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206 sb.append(",delta=");
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207 if (delta > 0) {
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208 sb.append('+');
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209 }
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210 sb.append(delta);
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211 sb.append(",cur=");
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212 sb.append(getNextChoice());
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213 sb.append(']');
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214 return sb.toString();
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215 }
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216
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217 @Override
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218 public Class<Integer> getChoiceType() {
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219 return Integer.class;
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220 }
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221
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222 @Override
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diff changeset
223 public ChoiceGenerator<Integer> randomize() {
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224 return new RandomOrderIntCG(this);
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225 }
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226 }