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package uk.ac.ox.cs.pagoda.reasoner;
import org.semanticweb.owlapi.model.OWLOntology;
import uk.ac.ox.cs.pagoda.constraints.UnaryBottom;
import uk.ac.ox.cs.pagoda.query.AnswerTuples;
import uk.ac.ox.cs.pagoda.query.QueryRecord;
import uk.ac.ox.cs.pagoda.query.QueryRecord.Step;
import uk.ac.ox.cs.pagoda.reasoner.light.BasicQueryEngine;
import uk.ac.ox.cs.pagoda.reasoner.light.RDFoxQueryEngine;
import uk.ac.ox.cs.pagoda.rules.LowerDatalogProgram;
import uk.ac.ox.cs.pagoda.util.Timer;
import uk.ac.ox.cs.pagoda.util.disposable.DisposedException;
class RLQueryReasoner extends QueryReasoner {
RDFoxQueryEngine rlLowerStore = null;
LowerDatalogProgram program;
Timer t = new Timer();
public RLQueryReasoner() {
rlLowerStore = new BasicQueryEngine("rl");
}
@Override
public void evaluate(QueryRecord queryRecord) {
if(isDisposed()) throw new DisposedException();
AnswerTuples rlAnswer = null;
t.reset();
try {
rlAnswer = rlLowerStore.evaluate(queryRecord.getQueryText(), queryRecord.getAnswerVariables());
queryRecord.updateLowerBoundAnswers(rlAnswer);
} finally {
if (rlAnswer != null) rlAnswer.dispose();
}
queryRecord.addProcessingTime(Step.LOWER_BOUND, t.duration());
queryRecord.setDifficulty(Step.LOWER_BOUND);
queryRecord.markAsProcessed();
}
@Override
public void dispose() {
super.dispose();
if(rlLowerStore != null) rlLowerStore.dispose();
}
@Override
public void loadOntology(OWLOntology ontology) {
if(isDisposed()) throw new DisposedException();
program = new LowerDatalogProgram();
program.load(ontology, new UnaryBottom());
program.transform();
importData(program.getAdditionalDataFile());
}
@Override
public boolean preprocess() {
if(isDisposed()) throw new DisposedException();
rlLowerStore.importRDFData("data", getImportedData());
rlLowerStore.materialise("lower program", program.toString());
return isConsistent();
}
@Override
public boolean isConsistent() {
if(isDisposed()) throw new DisposedException();
AnswerTuples ans = null;
try {
ans = rlLowerStore.evaluate(QueryRecord.botQueryText, new String[] {"X"});
return !ans.isValid();
} finally {
if (ans != null) ans.dispose();
}
}
@Override
public void evaluateUpper(QueryRecord record) {
if(isDisposed()) throw new DisposedException();
evaluate(record);
}
}
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