Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/event/EventTree.java @ 20:b1790909ebb1

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changed EventForest to derive from EventTree, which kills three birds with one stone - guaranteeing there is a default tree, being able to initialize a concrete forest with one method (createRoot), and being able to use both EventTree and EventForest with a ForestCGFactory, i.e. without changes to the config other than the event tree class name slight refactoring of EventTree (createTree() -> createRoot()) to make it more obvious how the result is used
author Peter Mehlitz <pcmehlitz@gmail.com>
date Mon, 06 Apr 2015 12:08:03 -0700
parents b920e6b1be83
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
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19 package gov.nasa.jpf.util.event;
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20
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21 import java.util.ArrayList;
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22 import java.util.List;
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23
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24 /**
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25 * an abstract class that creates Event trees
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26 *
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27 * While there is no need to provide specialized Event types or additional event
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28 * constructors, concrete subclasses have to provide a createRoot() implementation.
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29 *
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30 * A typical implementation looks like this
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31 *
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32 * class MyTree extends EventTree {
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33 * @Override
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34 * public Event createRoot() {
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35 * return sequence(
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36 * event("a"),
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37 * alternatives(
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38 * event("1"),
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39 * iteration(2,
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40 * event("x")
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41 * )
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42 * ),
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43 * event("b")
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44 * );
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45 * }
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46 * }
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47 *
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48 * or alternatively
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49 * class MyTree extends EventTree {
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50 * MyTree(){
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51 * root = sequence(
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52 * event("a"),
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53 * alternative(
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54 * event("1),
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55 * event("2")
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56 * )
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57 * );
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58 * }
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59 * }
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60 *
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61 * or alternatively as an anonymous class
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62 *
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63 * EventTree myTree = new EventTree(
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64 * sequence(
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65 * event("a"),
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66 * alternatives(
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67 * event("1"),
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68 * iteration(2,
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69 * event("x")
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70 * )
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71 * ),
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72 * event("b")
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73 * )
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74 * );
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75 *
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76 */
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77 public class EventTree implements EventConstructor {
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78
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79 public static final String CONFIG_KEY = "event.tree.class";
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80
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81 protected Event root;
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82
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83 /**
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84 * this is our purpose in life, which has to be provided by concrete subclasses
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85 */
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86 public Event createRoot() {
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87 // nothing here, needs to be overridden by subclass to populate tree
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88 return null;
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89 }
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90
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91 protected EventTree () {
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92 root = createRoot();
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93 }
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94
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95 protected EventTree (Event root){
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96 this.root = root;
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97 }
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98
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99 public Event getRoot(){
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100 return root;
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101 }
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102
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103 //--- inspection and debugging
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104
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105 static final List<Event> NO_EVENTS = new ArrayList<Event>(0);
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106
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107 public List<Event> visibleEndEvents(){
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108 if (root != null){
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109 return root.visibleEndEvents();
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110 } else {
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111 return NO_EVENTS;
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112 }
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113 }
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114
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115 public void printPaths(){
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116 for (Event es : visibleEndEvents()){
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117 es.printPath(System.out);
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118 System.out.println('.');
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119 }
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120 }
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121
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122 public void printTree (){
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123 if (root != null){
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124 root.printTree(System.out, 0);
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125 }
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126 }
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127
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128 /**
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129 * this should be overridden in case we want to check if this is an expected trace
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130 * The generic form can only check if this is a valid end event.
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131 *
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132 * To check for a whole trace, implementors should keep some sort of expected event specs
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133 */
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134 public boolean checkPath (Event lastEvent){
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135 for (Event ee : root.visibleEndEvents()){
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136 if (ee.equals(lastEvent)){
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137 return true;
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138 }
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139 }
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140
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141 return false;
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142 }
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143
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144 public boolean checkPath (Event lastEvent, String[] pathSpecs) {
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145 String trace = lastEvent.getPathString(null);
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146
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147 for (int i = 0; i < pathSpecs.length; i++) {
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148 if (trace.equals(pathSpecs[i])) {
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149 pathSpecs[i] = null;
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150 return true;
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151 }
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152 }
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153
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154 return false; // unexpected trace
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155 }
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156
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157 /**
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158 * override this if the concrete model keeps track of coverage
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159 *
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160 * @return [0.0..1.0]
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161 */
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162 public float getPathCoverage (){
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163 throw new UnsupportedOperationException("path coverage not supported by generic EventTree");
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164 }
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165
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166 /**
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167 * override this if the concrete model can keep track of coverage
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168 * call at the end of execution
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169 */
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170 public boolean isCompletelyCovered (){
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171 throw new UnsupportedOperationException("path coverage not supported by generic EventTree");
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172 }
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173
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174 /**
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175 * extend this tree with a new path
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176 */
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177 public void addPath (Event... path){
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178 if (root != null){
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179 root.addPath(path.length, path);
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180 } else {
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181 root = sequence(path);
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182 }
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183 }
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184
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185 public Event interleave (Event... otherTrees){
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186 if (root != null){
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187 return root.interleave( otherTrees);
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188
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189 } else {
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190 if (otherTrees == null || otherTrees.length == 0){
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191 return root;
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192
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193 } else {
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194 Event first = null;
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195 List<Event> rest = new ArrayList<Event>();
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196 for (int i=0; i< otherTrees.length; i++){
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197 if (otherTrees[i] != null){
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198 if (first == null){
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199 first = otherTrees[i];
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200 } else {
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201 rest.add( otherTrees[i]);
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202 }
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203 }
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204 }
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205
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206 if (first != null){
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diff changeset
207 if (rest.isEmpty()){
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208 return first;
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209 } else {
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210 Event[] ot = new Event[rest.size()];
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211 rest.toArray(ot);
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212 return first.interleave(ot);
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213 }
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214
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215 } else { // nothing to interleave at all
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216 return null;
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217 }
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218 }
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219 }
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220 }
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221
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222 public EventTree interleave (EventTree... otherTrees){
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223 Event[] otherRoots = new Event[otherTrees.length];
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224 for (int i=0; i<otherRoots.length; i++){
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225 otherRoots[i] = otherTrees[i].root;
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226 }
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227 return new EventTree( interleave( otherRoots));
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228 }
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diff changeset
229
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230 public Event removeSource (Object source){
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diff changeset
231 if (root != null){
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232 return root.removeSource(source);
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233
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234 } else { // nothing to remove from
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235 return null;
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parents:
diff changeset
236 }
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diff changeset
237 }
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diff changeset
238
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diff changeset
239 public int getMaxDepth(){
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diff changeset
240 if (root != null){
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diff changeset
241 return root.getMaxDepth();
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parents:
diff changeset
242 } else {
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diff changeset
243 return 0;
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parents:
diff changeset
244 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
245 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
246
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
247 }