Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/event/EventTree.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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children b920e6b1be83
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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 createEventTree() 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 * public Event createEventTree1() {
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33 * return sequence(
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34 * event("a"),
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35 * alternatives(
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36 * event("1"),
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37 * iteration(2,
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38 * event("x")
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39 * )
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40 * ),
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41 * event("b")
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42 * );
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43 * }
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44 */
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45 public class EventTree extends EventConstructor {
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46
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47 public static final String CONFIG_KEY = "event.class";
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48
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49 protected Event root;
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50
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51 /**
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52 * this is our purpose in life, which has to be provided by concrete subclasses
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53 */
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54 public Event createEventTree() {
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55 // nothing here, needs to be overridden by subclass to populate tree
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56 return null;
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57 }
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58
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59 protected EventTree (){
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60 root = createEventTree();
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61 }
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62
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63 protected EventTree (Event root){
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64 this.root = root;
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65 }
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66
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67 public Event getRoot(){
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68 return root;
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69 }
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70
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71 //--- inspection and debugging
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72
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73 static final List<Event> NO_EVENTS = new ArrayList<Event>(0);
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74
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75 public List<Event> visibleEndEvents(){
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76 if (root != null){
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77 return root.visibleEndEvents();
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78 } else {
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79 return NO_EVENTS;
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80 }
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81 }
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82
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83 public void printPaths(){
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84 for (Event es : visibleEndEvents()){
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85 es.printPath(System.out);
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86 System.out.println('.');
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87 }
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88 }
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89
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90 public void printTree (){
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91 if (root != null){
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92 root.printTree(System.out, 0);
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93 }
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94 }
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95
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96 /**
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97 * this should be overridden in case we want to check if this is an expected trace
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98 * The generic form can only check if this is a valid end event.
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99 *
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100 * To check for a whole trace, implementors should keep some sort of expected event specs
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101 */
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102 public boolean checkPath (Event lastEvent){
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103 for (Event ee : root.visibleEndEvents()){
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104 if (ee.equals(lastEvent)){
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105 return true;
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106 }
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107 }
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108
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109 return false;
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110 }
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111
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112 public boolean checkPath (Event lastEvent, String[] pathSpecs) {
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113 String trace = lastEvent.getPathString(null);
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114
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115 for (int i = 0; i < pathSpecs.length; i++) {
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116 if (trace.equals(pathSpecs[i])) {
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117 pathSpecs[i] = null;
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118 return true;
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119 }
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120 }
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121
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122 return false; // unexpected trace
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123 }
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124
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125 /**
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126 * override this if the concrete model keeps track of coverage
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127 *
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128 * @return [0.0..1.0]
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129 */
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130 public float getPathCoverage (){
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131 throw new UnsupportedOperationException("path coverage not supported by generic EventTree");
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132 }
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133
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134 /**
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135 * override this if the concrete model can keep track of coverage
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136 * call at the end of execution
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137 */
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138 public boolean isCompletelyCovered (){
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139 throw new UnsupportedOperationException("path coverage not supported by generic EventTree");
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140 }
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141
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142 /**
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143 * extend this tree with a new path
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144 */
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145 public void addPath (Event... path){
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146 if (root != null){
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147 root.addPath(path.length, path);
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148 } else {
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149 root = sequence(path);
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150 }
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151 }
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152
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153 public Event interleave (Event... otherTrees){
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154 if (root != null){
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155 return root.interleave( otherTrees);
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156
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157 } else {
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158 if (otherTrees == null || otherTrees.length == 0){
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159 return root;
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160
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161 } else {
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162 Event first = null;
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163 List<Event> rest = new ArrayList<Event>();
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164 for (int i=0; i< otherTrees.length; i++){
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165 if (otherTrees[i] != null){
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166 if (first == null){
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167 first = otherTrees[i];
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168 } else {
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169 rest.add( otherTrees[i]);
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170 }
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171 }
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172 }
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173
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174 if (first != null){
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175 if (rest.isEmpty()){
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176 return first;
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177 } else {
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178 Event[] ot = new Event[rest.size()];
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179 rest.toArray(ot);
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180 return first.interleave(ot);
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181 }
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182
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183 } else { // nothing to interleave at all
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184 return null;
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185 }
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186 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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187 }
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188 }
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189
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190 public EventTree interleave (EventTree... otherTrees){
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191 Event[] otherRoots = new Event[otherTrees.length];
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192 for (int i=0; i<otherRoots.length; i++){
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193 otherRoots[i] = otherTrees[i].root;
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194 }
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195 return new EventTree( interleave( otherRoots));
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196 }
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197
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198 public Event removeSource (Object source){
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199 if (root != null){
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200 return root.removeSource(source);
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201
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202 } else { // nothing to remove from
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203 return null;
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204 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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205 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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206
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207 public int getMaxDepth(){
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208 if (root != null){
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209 return root.getMaxDepth();
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210 } else {
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211 return 0;
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212 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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213 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
214
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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215 }