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package uk.ac.ox.cs.pagoda.rules;
import org.apache.commons.io.FilenameUtils;
import org.semanticweb.HermiT.Reasoner;
import org.semanticweb.HermiT.model.*;
import org.semanticweb.owlapi.model.*;
import org.semanticweb.owlapi.reasoner.Node;
import uk.ac.ox.cs.pagoda.constraints.BottomStrategy;
import uk.ac.ox.cs.pagoda.constraints.NullaryBottom;
import uk.ac.ox.cs.pagoda.constraints.UnaryBottom;
import uk.ac.ox.cs.pagoda.constraints.UpperUnaryBottom;
import uk.ac.ox.cs.pagoda.multistage.Normalisation;
import uk.ac.ox.cs.pagoda.multistage.RestrictedApplication;
import uk.ac.ox.cs.pagoda.rules.approximators.Approximator;
import uk.ac.ox.cs.pagoda.util.Timer;
import uk.ac.ox.cs.pagoda.util.Utility;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;
public class LowerDatalogProgram extends ApproxProgram implements IncrementalProgram {
boolean m_toClassify;
public LowerDatalogProgram() {
m_toClassify = true;
}
public LowerDatalogProgram(boolean toClassify) {
m_toClassify = toClassify; // false; //
}
void clone(Program program) {
super.clone(program);
if (botStrategy instanceof UpperUnaryBottom)
botStrategy = new UnaryBottom();
}
@Override
public void transform() {
if (m_toClassify) {
ClassifyThread thread = new ClassifyThread(this);
thread.start();
super.transform();
try {
thread.join(5000);
} catch (InterruptedException e) {
return ;
}
if (!thread.isAlive()) thread.dispose();
else thread.interrupt();
}
else
super.transform();
Normalisation norm = new Normalisation(dlOntology.getDLClauses(), ontology, new NullaryBottom());
BottomStrategy tBottom = new NullaryBottom();
norm.process();
for (DLClause nClause: norm.getNormlisedClauses()) {
if (nClause.getHeadLength() != 1)
for (DLClause newClause: RestrictedApplication.addAdditionalDatalogRules(nClause, tBottom, norm)) {
// System.out.println(newClause);
if (newClause.getHeadAtom(0).getDLPredicate() instanceof AtomicConcept || newClause.getHeadAtom(0).getDLPredicate() instanceof AtomicRole) {
// System.out.println(newClause);
clauses.add(newClause);
}
}
if (nClause.getHeadLength() == 1 && (nClause.getHeadAtom(0).getDLPredicate() instanceof AtomicConcept || nClause.getHeadAtom(0).getDLPredicate() instanceof AtomicRole) && clauses.add(nClause)) {
// System.out.println(nClause);
}
}
}
@Override
public String getOutputPath() {
return FilenameUtils.concat(getDirectory(), "lower.dlog");
}
// @Override
// public String getDirectory() {
// File dir = new File(ontologyDirectory + Utility.FILE_SEPARATOR + "datalog");
// if (!dir.exists())
// dir.mkdirs();
// return dir.getPath();
// }
@Override
public void enrich(Collection<DLClause> delta) {
synchronized (clauses) {
Iterator<DLClause> iter = delta.iterator();
while (iter.hasNext())
clauses.add(iter.next());
}
}
@Override
public String toString() {
String text;
synchronized (clauses) {
text = super.toString();
}
return text;
}
@Override
protected void initApproximator() {
m_approx = new IgnoreBoth();
}
private class IgnoreBoth implements Approximator {
@Override
public Collection<DLClause> convert(DLClause clause, DLClause originalClause) {
Collection<DLClause> ret = new LinkedList<DLClause>();
if (clause.getHeadLength() > 1) return ret;
if (clause.getHeadLength() > 0) {
DLPredicate predicate = clause.getHeadAtom(0).getDLPredicate();
if (predicate instanceof AtLeast) return ret;
}
ret.add(clause);
return ret;
}
}
}
class ClassifyThread extends Thread {
IncrementalProgram m_program;
Collection<DLClause> clauses = new LinkedList<DLClause>();
Variable X = Variable.create("X"), Y = Variable.create("Y");
Reasoner hermitReasoner;
OWLOntology ontology;
ClassifyThread(IncrementalProgram program) {
m_program = program;
}
@Override
public void run() {
ontology = m_program.getOntology();
try {
hermitReasoner = new Reasoner(ontology);
Timer t = new Timer();
hermitReasoner.classifyClasses();
Utility.logInfo("HermiT classification done: " + t.duration());
} catch (Exception e) {
// e.printStackTrace();
Utility.logInfo("HermiT cannot classify the ontology.");
hermitReasoner = null;
}
}
public void dispose() {
if (hermitReasoner == null)
return ;
Set<OWLClass> classes;
OWLClass lastClass = null, currentClass;
for (OWLClass subClass: ontology.getClassesInSignature()) {
Node<OWLClass> node = hermitReasoner.getEquivalentClasses(subClass);
if (!subClass.equals(node.getRepresentativeElement())) continue;
classes = node.getEntities();
lastClass = subClass;
for (Iterator<OWLClass> iter = classes.iterator(); iter.hasNext(); ) {
currentClass = iter.next();
if (currentClass.equals(subClass)) continue;
addClause(lastClass, currentClass);
lastClass = currentClass;
}
addClause(lastClass, subClass);
for (Node<OWLClass> tNode: hermitReasoner.getSuperClasses(subClass, true)) {
OWLClass superClass = tNode.getRepresentativeElement();
addClause(subClass, superClass);
}
}
Set<OWLObjectPropertyExpression> properties;
OWLObjectPropertyExpression lastProperty, currentProperty;
for (OWLObjectProperty subProperty: ontology.getObjectPropertiesInSignature()) {
Node<OWLObjectPropertyExpression> node = hermitReasoner.getEquivalentObjectProperties(subProperty);
if (!subProperty.equals(node.getRepresentativeElement())) continue;
properties = node.getEntities();
lastProperty = subProperty;
for (Iterator<OWLObjectPropertyExpression> iter = properties.iterator(); iter.hasNext(); ) {
currentProperty = iter.next();
if (currentProperty.equals(subProperty)) continue;
addClause(lastProperty, currentProperty);
lastProperty = currentProperty;
}
addClause(lastProperty, subProperty);
for (Node<OWLObjectPropertyExpression> tNode: hermitReasoner.getSuperObjectProperties(subProperty, true)) {
OWLObjectPropertyExpression superProperty = tNode.getRepresentativeElement();
addClause(subProperty, superProperty);
}
}
m_program.enrich(clauses);
Utility.logInfo("classification done and enriched lower bound rules.");
}
private void addClause(OWLObjectPropertyExpression subProperty, OWLObjectPropertyExpression superProperty) {
if (subProperty.equals(superProperty)) return ;
if (superProperty.toString().equals("owl:topObjectProperty")) return ;
clauses.add(DLClause.create(new Atom[] { getAtom(superProperty) }, new Atom[] { getAtom(subProperty) }));
}
private Atom getAtom(OWLObjectPropertyExpression p) {
if (p instanceof OWLObjectInverseOf)
return Atom.create(AtomicRole.create(((OWLObjectProperty) ((OWLObjectInverseOf) p).getInverse()).toStringID()), Y, X);
return Atom.create(AtomicRole.create(((OWLObjectProperty) p).toStringID()), X, Y);
}
private void addClause(OWLClass subClass, OWLClass superClass) {
if (subClass.equals(superClass)) return ;
if (subClass.toString().equals("owl:Nothing")) return ;
if (superClass.toString().equals("owl:Thing")) return ;
clauses.add(DLClause.create(new Atom[] { getAtom(superClass) }, new Atom[] { getAtom(subClass) }));
}
private Atom getAtom(OWLClass c) {
return Atom.create(AtomicConcept.create(c.toStringID()), X);
}
}
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