Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/event/EventConstructor.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 61d41facf527
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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 /**
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22 * abstract class that hold API to create event trees
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23 *
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24 * this factors out constructor methods so that they can be used inside of
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25 * EventTrees and EventForests
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26 */
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27 public interface EventConstructor {
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28
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29 //--- overridable event factory method to facilitate creation of specialized event classes
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30
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31 default Event event (String name) {
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32 return new Event(name, this);
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33 }
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34
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35 default Event event (String name, Object... arguments){
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36 return new Event(name, arguments, this);
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37 }
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38
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39 //--- compound constructors that create sets of events
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40
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41 default Event alternatives (Event... events){
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42 Event last = events[0];
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43 for (int i = 1; i < events.length; i++) {
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44 Event e = events[i];
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45 last.setAlt(e);
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46 last = e;
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47 }
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48 return events[0];
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49 }
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50
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51 default Event sequence (Event... events) {
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52 Event base = events[0];
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53
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54 for (int i = 1; i < events.length; i++) {
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55 base.addNext(events[i]);
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56 }
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57 return base;
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58 }
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59
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60 default Event iteration (int count, Event... events) {
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61 Event seq = sequence(events);
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62 Event[] it = new Event[count];
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63
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64 it[0] = seq;
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65 for (int i=1; i<count; i++){
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66 it[i] = seq.deepClone();
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67 }
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68
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69 return sequence(it);
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70 }
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71
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72 /**
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73 * an alterative of all combinations of the specified events (regardless of order)
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74 */
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75 default Event anyCombination (Event... events){
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76 int n = events.length;
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77 int max = 0;
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78 for (int i=0; i<n; i++){
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79 max = (max << 1) | 1;
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80 }
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81
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82 Event[] pathBuffer = new Event[n];
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83
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84 // we use the no-event as the anchor
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85 Event eFirst = new NoEvent();
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86
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87 // now fill in all the remaining combinations
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88 for (int i=1; i<=max; i++){
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89 // init the path buffer
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90 int pathLength=0;
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91 for (int j=0, m=i; m != 0; j++){
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92 if ((m & 1) != 0){
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93 pathBuffer[pathLength++] = events[j];
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94 }
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95 m>>>=1;
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96 }
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97
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98 eFirst.addPath( pathLength, pathBuffer);
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99 }
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100
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101 return eFirst;
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102 }
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103
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104
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105 default void generatePermutation (int length, Event[] events, Event anchor, Event perm){
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106 if (length == 0){
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107 anchor.addAlternative(perm);
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108
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109 } else {
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110 outer:
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111 for (Event e : events){
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112 if (perm != null){
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113 // check if e is already in there
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114 for (Event ee = perm; ee != null; ee = ee.getNext()){
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115 if (ee.equals(e)){
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116 continue outer;
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117 }
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118 }
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119 e = perm.deepClone().addNext(e.deepClone());
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120
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121 } else {
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122 e = e.deepClone();
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123 }
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124
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125 generatePermutation( length-1, events, anchor, e);
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126 }
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127 }
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128 }
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129
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130 /**
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131 * generate tree with all event permutations without repetitions.
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132 * <2do> this is not particularly optimized
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133 */
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134 default Event anyPermutation (Event... events){
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135 Event a = new NoEvent();
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136 generatePermutation( events.length, events, a, null);
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137 return a.getAlt();
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138 }
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139
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140 }