Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/event/EventChoiceGenerator.java @ 9:8de43b2b023f

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added choice getters for EventChoiceGenerator added some minor Event functions
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 13 Feb 2015 20:20:15 -0800
parents fdc263e5806b
children b1790909ebb1
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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
2
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21 import gov.nasa.jpf.util.Predicate;
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22 import gov.nasa.jpf.vm.ChoiceGeneratorBase;
2
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23 import gov.nasa.jpf.vm.SystemState;
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26 /**
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27 * ChoiceGenerator for Events.
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28 * This is basically just a pointer into the event tree
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29 */
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30 public class EventChoiceGenerator extends ChoiceGeneratorBase<Event> {
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31
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32 protected Event base;
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33 protected Event cur;
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34 protected int nProcessed;
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35
2
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36 protected EventContext ctx; // optional, can replace/expand events during execution
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37
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38 /**
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39 * convenience method to get successors from current CG chain
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40 */
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41 public static EventChoiceGenerator getNext (SystemState ss, String id, Event base, EventContext ctx){
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42 EventChoiceGenerator cgPrev = ss.getLastChoiceGeneratorOfType(EventChoiceGenerator.class);
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43 if (cgPrev == null){
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44 return new EventChoiceGenerator( id, base, ctx);
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45 } else {
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46 return cgPrev.getSuccessor(id, ctx);
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47 }
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48 }
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49
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50 public EventChoiceGenerator (String id, Event base){
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51 this(id, base, null);
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52 }
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54 public EventChoiceGenerator (String id, Event base, EventContext ctx) {
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55 super(id);
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56 this.base = base;
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57 this.ctx = ctx;
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58 }
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59
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60 @Override
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61 public Event getChoice (int idx){
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62 if (idx >= 0){
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63 Event e = base;
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64 for (int i=0; i<idx; i++){
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65 e = e.alt;
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66 if (e == null){
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67 break;
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68 } else {
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69 return e;
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70 }
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71 }
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72
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73 }
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74 throw new IllegalArgumentException("choice index out of range: " + idx);
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75 }
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76
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78 public void setContextExpander (EventContext ctx){
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79 this.ctx = ctx;
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80 }
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81
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82 public boolean containsMatchingChoice (Predicate<Event> predicate){
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83 for (Event e = base; e != null; e = e.getAlt()){
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84 if (predicate.isTrue(e)){
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85 return true;
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86 }
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87 }
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88 return false;
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89 }
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90
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91 public void addChoice (Event newEvent){
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92 for (Event e = base; e != null;){
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93 Event eAlt = e.getAlt();
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94 if (eAlt == null){
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95 e.setAlt(newEvent);
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96 return;
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97 }
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98 e = eAlt;
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99 }
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100 }
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101
0
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102 public EventChoiceGenerator getSuccessor (String id){
2
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103 return getSuccessor(id, null);
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104 }
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105
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106 public EventChoiceGenerator getSuccessor (String id, EventContext ctx){
0
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107 if (cur == null){
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108 return new EventChoiceGenerator(id, base.getNext(), ctx);
0
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109
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110 } else {
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111 Event next = cur.getNext();
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112
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113 if (cur instanceof CheckEvent){ // CheckEvents use next for conjunction
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114 while (next instanceof CheckEvent){
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115 next = next.getNext();
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116 }
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117 }
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118
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119 if (next != null){
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120 return new EventChoiceGenerator( id, next, ctx);
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121 } else {
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122 return null; // done
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123 }
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124 }
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125 }
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126
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127 @Override
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128 public Event getNextChoice () {
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129 return cur;
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130 }
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131
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132
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133 @Override
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134 public boolean hasMoreChoices () {
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135 if (cur == null){
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136 return (nProcessed == 0);
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137 } else {
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138 return (cur.getAlt() != null);
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139 }
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140 }
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141
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142 @Override
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143 public void advance () {
2
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144 if (cur == null){
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145 if (nProcessed == 0){
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146 cur = base;
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147 nProcessed = 1;
0
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148 }
2
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149 } else {
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150 cur = cur.getAlt();
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151 nProcessed++;
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152 }
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153
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154 if (ctx != null){
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155 Event newCur = ctx.map(cur);
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156 if (newCur != cur){
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157 cur = newCur;
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158 }
0
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159 }
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160 }
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161
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162 @Override
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163 public void reset () {
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164 isDone = false;
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165 cur = null;
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166 nProcessed = 0;
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167 }
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168
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169 @Override
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170 public int getTotalNumberOfChoices () {
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171 return base.getNumberOfAlternatives();
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172 }
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173
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174 @Override
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175 public int getProcessedNumberOfChoices () {
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176 return nProcessed;
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177 }
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178
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179 @Override
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180 public String toString() {
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181 StringBuilder sb = new StringBuilder(getClass().getName());
2
b920e6b1be83 second part of the jpf-statechart motivated event interface overhaul, providing dynamic (context specific) expansion of EventTrees from within EventChoiceGenerators. This adds a EventContext mechanism that can replace events on-the-fly during advance() (e.g. expand wildcard patterns)
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182 sb.append("{id:\"");
0
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183 sb.append(id);
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184 sb.append('"');
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185
2
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186 //sb.append(",isCascaded:");
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187 //sb.append(Boolean.toString(isCascaded));
0
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188
2
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189 sb.append(",[");
0
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190 for (Event e=base; e!= null; e = e.getAlt()){
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191 if (e != base){
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192 sb.append(',');
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193 }
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194 if (e == cur){
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195 sb.append(MARKER);
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196 }
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197 sb.append(e.toString());
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198 }
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199 sb.append("],cur:");
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200 sb.append(cur);
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201 sb.append("}");
0
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202
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203 return sb.toString();
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204 }
1
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diff changeset
205
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diff changeset
206 @Override
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207 public Class<Event> getChoiceType() {
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diff changeset
208 return Event.class;
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209 }
9
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diff changeset
210
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diff changeset
211 protected Event[] getFirstNChoices(int n){
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diff changeset
212 Event[] a = new Event[n];
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diff changeset
213
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214 Event e = base;
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diff changeset
215 for (int i=0; i<n; i++){
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diff changeset
216 a[i] = e;
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diff changeset
217 e = e.getAlt();
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diff changeset
218 }
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219
8de43b2b023f added choice getters for EventChoiceGenerator
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diff changeset
220 return a;
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diff changeset
221 }
8de43b2b023f added choice getters for EventChoiceGenerator
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diff changeset
222
8de43b2b023f added choice getters for EventChoiceGenerator
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223 @Override
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224 public Event[] getAllChoices(){
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225 return getFirstNChoices( getTotalNumberOfChoices());
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226 }
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227
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228 @Override
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229 public Event[] getProcessedChoices(){
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230 return getFirstNChoices( getProcessedNumberOfChoices());
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231 }
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232
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233 @Override
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234 public Event[] getUnprocessedChoices(){
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235 int n=0;
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236 for (Event e=cur; e != null; e = e.getAlt()){
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237 n++;
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238 }
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239
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240 Event[] a = new Event[n];
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241
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242 Event e = cur;
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243 for (int i=0; i<n; i++){
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244 a[i] = e;
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245 e = e.getAlt();
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246 }
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247
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248 return a;
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249 }
0
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250 }