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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;
public class RLQueryReasoner extends QueryReasoner {
RDFoxQueryEngine rlLowerStore = null;
LowerDatalogProgram program;
public RLQueryReasoner() {
rlLowerStore = new BasicQueryEngine("rl");
}
Timer t = new Timer();
@Override
public void evaluate(QueryRecord queryRecord) {
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.LowerBound, t.duration());
queryRecord.setDifficulty(Step.LowerBound);
queryRecord.markAsProcessed();
}
@Override
public void dispose() {
if (rlLowerStore != null) rlLowerStore.dispose();
super.dispose();
}
@Override
public void loadOntology(OWLOntology ontology) {
program = new LowerDatalogProgram();
program.load(ontology, new UnaryBottom());
program.transform();
importData(program.getAdditionalDataFile());
}
@Override
public boolean preprocess() {
rlLowerStore.importRDFData("data", importedData.toString());
rlLowerStore.materialise("lower program", program.toString());
if (!isConsistent())
return false;
return true;
}
@Override
public boolean isConsistent() {
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) {
evaluate(record);
}
}
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