org.semanticweb.elk.reasoner.query.SubClassOfEntailmentQuery Maven / Gradle / Ivy
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* ELK Reasoner Core
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package org.semanticweb.elk.reasoner.query;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.semanticweb.elk.reasoner.entailments.impl.DerivedClassInclusionEntailsSubClassOfAxiomImpl;
import org.semanticweb.elk.reasoner.entailments.impl.SubClassInconsistencyEntailsSubClassOfAxiomImpl;
import org.semanticweb.elk.reasoner.entailments.model.EntailmentInference;
import org.semanticweb.elk.reasoner.entailments.model.SubClassOfAxiomEntailment;
import org.semanticweb.elk.reasoner.indexing.model.IndexedClassExpression;
import org.semanticweb.elk.reasoner.indexing.model.IndexedContextRoot;
import org.semanticweb.elk.reasoner.proof.ReasonerProof;
import org.semanticweb.elk.reasoner.saturation.SaturationState;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.ClassInconsistency;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SaturationConclusion;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubClassInclusionComposed;
import org.semanticweb.elk.reasoner.saturation.context.Context;
/**
* Query whether an {@link org.semanticweb.elk.owl.interfaces.ElkSubClassOfAxiom
* ElkSubClassOfAxiom} is entailed.
*
* @author Peter Skocovsky
*/
public class SubClassOfEntailmentQuery
extends AbstractIndexedEntailmentQuery {
/**
* Indexed class that should be a subclass of {@link #superClass_}.
*/
private final IndexedClassExpression subClass_;
/**
* Indexed class that should be a superclass of {@link #subClass_}.
*/
private final IndexedClassExpression superClass_;
/**
* @param query
* What entailment is queried.
* @param subClass
* Indexed class that should be a subclass of {@code superClass}.
* @param superClass
* Indexed class that should be a superclass of {@code subClass}.
*/
public SubClassOfEntailmentQuery(final SubClassOfAxiomEntailment query,
final IndexedClassExpression subClass,
final IndexedClassExpression superClass) {
super(query);
this.subClass_ = subClass;
this.superClass_ = superClass;
}
@Override
public Collection getPositivelyIndexed() {
return Collections.singleton(subClass_);
}
@Override
public ReasonerProof getEvidence(
final boolean atMostOne, final SaturationState saturationState,
final SaturationConclusion.Factory conclusionFactory)
throws ElkQueryException {
return new ReasonerProof() {
@Override
public Collection getInferences(
final Object conclusion) {
final List result = new ArrayList(
2);
if (!getQuery().equals(conclusion)) {
return result;
}
// else
final Context context = saturationState.getContext(subClass_);
if (context == null) {
// not entailed
return result;
}
// else
final ClassInconsistency contradiction = conclusionFactory
.getContradiction(subClass_);
final SubClassInclusionComposed subsumption = conclusionFactory
.getSubClassInclusionComposed(subClass_, superClass_);
if (context.containsConclusion(contradiction)) {
result.add(
new SubClassInconsistencyEntailsSubClassOfAxiomImpl(
getQuery(), contradiction));
if (atMostOne) {
return result;
}
// else
}
if (context.containsConclusion(subsumption)) {
result.add(
new DerivedClassInclusionEntailsSubClassOfAxiomImpl(
getQuery(), subsumption));
}
return result;
}
};
}
}