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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.generator;
import tools.refinery.language.semantics.ProblemTrace;
import tools.refinery.store.dse.strategy.BestFirstStoreManager;
import tools.refinery.store.map.Version;
import tools.refinery.store.model.ModelStore;
import tools.refinery.store.reasoning.interpretation.PartialInterpretation;
import tools.refinery.store.reasoning.literal.Concreteness;
import tools.refinery.store.reasoning.representation.PartialSymbol;
import tools.refinery.store.reasoning.seed.ModelSeed;
public class ModelGenerator extends ModelFacade {
private final Version initialVersion;
private int randomSeed = 0;
private boolean lastGenerationSuccessful;
public ModelGenerator(ProblemTrace problemTrace, ModelStore store, ModelSeed modelSeed) {
super(problemTrace, store, modelSeed, Concreteness.CANDIDATE);
initialVersion = getModel().commit();
}
public int getRandomSeed() {
return randomSeed;
}
public void setRandomSeed(int randomSeed) {
this.randomSeed = randomSeed;
this.lastGenerationSuccessful = false;
}
public boolean isLastGenerationSuccessful() {
return lastGenerationSuccessful;
}
// This method only makes sense if it returns {@code true} on success.
@SuppressWarnings("BooleanMethodIsAlwaysInverted")
public boolean tryGenerate() {
lastGenerationSuccessful = false;
randomSeed++;
var bestFirst = new BestFirstStoreManager(getModelStore(), 1);
bestFirst.startExploration(initialVersion, randomSeed);
var solutions = bestFirst.getSolutionStore().getSolutions();
if (solutions.isEmpty()) {
return false;
}
getModel().restore(solutions.get(0).version());
lastGenerationSuccessful = true;
return true;
}
public void generate() {
if (!tryGenerate()) {
throw new UnsatisfiableProblemException();
}
}
@Override
public <A, C> PartialInterpretation<A, C> getPartialInterpretation(PartialSymbol<A, C> partialSymbol) {
if (!lastGenerationSuccessful) {
throw new IllegalStateException("No generated model is available");
}
return super.getPartialInterpretation(partialSymbol);
}
}
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