de.uni.freiburg.iig.telematik.jagal.ts.util.TSMinimizer Maven / Gradle / Ivy

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JAGAL provides implementations for directed graphs (weighted and unweighted) and various types of transition systems as well as utils for graph traversal and modification.
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package de.uni.freiburg.iig.telematik.jagal.ts.util;

import java.util.HashSet;

import de.uni.freiburg.iig.telematik.jagal.ts.MarkingStatePairContainer;
import de.uni.freiburg.iig.telematik.jagal.ts.StatePair;
import de.uni.freiburg.iig.telematik.jagal.ts.StatePairContainer;
import de.uni.freiburg.iig.telematik.jagal.ts.exception.StateNotFoundException;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.LabeledTransitionSystem;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.abstr.AbstractEvent;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.abstr.AbstractLTSState;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.abstr.AbstractLabeledTransitionRelation;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.abstr.AbstractLabeledTransitionSystem;
import de.uni.freiburg.iig.telematik.jagal.ts.labeled.exception.EventNotFoundException;

public class TSMinimizer {

        public static , R extends AbstractLabeledTransitionRelation, O> void minimize(AbstractLabeledTransitionSystem ts) {

                if (!ts.isDFA()) {
                        throw new IllegalArgumentException("This minimization only operates on DFNs");
                }
                MarkingStatePairContainer container = MarkingStatePairContainer.newInstance(StatePairContainer.getStatePairsFrom(ts.getStates()));
                for (StatePair statePair : container.getStatePairs()) {
                        if ((ts.isEndState(statePair.state1.getName()) && !ts.isEndState(statePair.state2.getName()))
                                || (!ts.isEndState(statePair.state1.getName()) && ts.isEndState(statePair.state2.getName()))) {
                                container.markPair(StatePair.createStatePair(statePair.state1, statePair.state2));
                        }
                }

                boolean newMarkedPairs;
                do {
                        newMarkedPairs = false;
                        for (StatePair statePair : new HashSet<>(container.getUnmarkedStatePairs())) {
                                for (E event : ts.getEvents()) {
                                        try {
                                                if ((!ts.getTargetsFor(statePair.state1.getName(), event.getName()).isEmpty() && !ts.getTargetsFor(statePair.state2.getName(), event.getName()).isEmpty())
                                                        && (container.isMarked(ts.getTargetsFor(statePair.state1.getName(), event.getName()).get(0), ts.getTargetsFor(statePair.state2.getName(), event.getName()).get(0)))) {
                                                        container.markPair(statePair);
                                                        newMarkedPairs = true;
                                                        break;
                                                }
                                        } catch (StateNotFoundException | EventNotFoundException e) {
                                                throw new RuntimeException(e);
                                        }
                                }
                        }
                } while (newMarkedPairs);

	//TODO: Merging
//		System.out.println("pairs: "+ container.getUnmarkedStatePairs());
        }

        public static void main(String[] args) throws Exception {
                LabeledTransitionSystem ts = new LabeledTransitionSystem();
                ts.addState("z0");
                ts.addState("z1");
                ts.addState("z2");
                ts.addState("z3");
                ts.addState("z4");
                ts.addStartState("z0");
                ts.addEndState("z4");
                ts.addEvent("e0");
                ts.addEvent("e1");
                ts.addRelation("z0", "z1", "e0");
                ts.addRelation("z0", "z2", "e1");
                ts.addRelation("z1", "z4", "e0");
                ts.addRelation("z1", "z2", "e1");
                ts.addRelation("z2", "z2", "e1");
                ts.addRelation("z2", "z3", "e0");
                ts.addRelation("z3", "z0", "e1");
                ts.addRelation("z3", "z4", "e0");
                ts.addRelation("z4", "z4", "e0");
                ts.addRelation("z4", "z4", "e1");
                System.out.println(ts);
                TSMinimizer.minimize(ts);
//		MarkingStatePairContainer cont = new MarkingStatePairContainer();
//		System.out.println(cont.getUnmarkedStatePairs());
        }

}