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package uk.ac.ox.cs.pagoda.tracking;
import org.semanticweb.HermiT.model.*;
import uk.ac.ox.cs.pagoda.hermit.DLClauseHelper;
import uk.ac.ox.cs.pagoda.multistage.Normalisation;
import uk.ac.ox.cs.pagoda.query.QueryRecord;
import uk.ac.ox.cs.pagoda.reasoner.light.BasicQueryEngine;
import uk.ac.ox.cs.pagoda.rules.UpperDatalogProgram;
import uk.ac.ox.cs.pagoda.rules.approximators.OverApproxExist;
import uk.ac.ox.cs.pagoda.util.Namespace;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;
public class TrackingRuleEncoderDisjVar2 extends TrackingRuleEncoderWithGap {
public TrackingRuleEncoderDisjVar2(UpperDatalogProgram program, BasicQueryEngine store) {
super(program, store);
}
private Set<DLClause> disjunctiveRules = new HashSet<DLClause>();
@Override
public boolean encodingRules() {
if (ruleEncoded) return false;
ruleEncoded = true;
for (DLClause clause: program.getClauses()) {
encodingRule(clause);
}
if (disjunctiveRules.isEmpty())
return true;
processDisjunctiveRules();
return false;
}
@Override
protected void encodingRule(DLClause clause) {
DLClause original = program.getCorrespondingClause(clause);
if (original.getHeadLength() <= 1) {
super.encodingRule(clause);
}
else {
if (!DLClauseHelper.hasSubsetBodyAtoms(clause, original))
super.encodingRule(clause);
addDisjunctiveRule(original);
}
}
private void processDisjunctiveRules() {
for (DLClause clause: disjunctiveRules)
encodingDisjunctiveRule(clause);
}
private Atom getAuxiliaryAtom(Atom headAtom) {
DLPredicate p = headAtom.getDLPredicate();
if (p instanceof AtLeastConcept) {
return Atom.create(generateAuxiliaryRule((AtLeastConcept) p), headAtom.getArgument(0));
}
if (p instanceof AtomicConcept)
return Atom.create(generateAuxiliaryRule((AtomicConcept) p), headAtom.getArgument(0));
if (p instanceof AtomicRole)
return Atom.create(generateAuxiliaryRule((AtomicRole) p), headAtom.getArgument(0), headAtom.getArgument(1));
if (p instanceof Equality || p instanceof AnnotatedEquality)
return Atom.create(generateAuxiliaryRule(Equality.INSTANCE), headAtom.getArgument(0), headAtom.getArgument(1));
if (p instanceof Inequality)
return Atom.create(generateAuxiliaryRule((Inequality) p), headAtom.getArgument(0), headAtom.getArgument(1));
return null;
}
private Atom getGapAtom(Atom headAtom) {
DLPredicate p = headAtom.getDLPredicate();
if (p instanceof AtLeastConcept) {
return Atom.create(getGapDLPredicate(AtomicConcept.create(Normalisation.getAuxiliaryConcept4Disjunct((AtLeastConcept) p))), headAtom.getArgument(0));
}
if (p instanceof AtomicConcept)
return Atom.create(getGapDLPredicate(p), headAtom.getArgument(0));
if (p instanceof AtomicRole)
return Atom.create(getGapDLPredicate(p), headAtom.getArgument(0), headAtom.getArgument(1));
if (p instanceof Equality || p instanceof AnnotatedEquality)
return Atom.create(getGapDLPredicate(Equality.INSTANCE), headAtom.getArgument(0), headAtom.getArgument(1));
if (p instanceof Inequality)
return Atom.create(getGapDLPredicate(p), headAtom.getArgument(0), headAtom.getArgument(1));
return null;
}
private void encodingDisjunctiveRule(DLClause clause) {
int headLength = clause.getHeadLength();
Atom[] auxAtoms = new Atom[headLength];
for (int i = 0; i < headLength; ++i)
auxAtoms[i] = getAuxiliaryAtom(clause.getHeadAtom(i));
Atom[] gapAtoms = new Atom[headLength];
for (int i = 0; i < headLength; ++i)
gapAtoms[i] = getGapAtom(clause.getHeadAtom(i));
Atom[] bodyAtoms = clause.getBodyAtoms();
LinkedList<Atom> newHeadAtoms = new LinkedList<Atom>();
DLPredicate selected = AtomicConcept.create(getSelectedPredicate());
newHeadAtoms.add(Atom.create(selected, getIndividual4GeneralRule(clause)));
for (Atom atom: bodyAtoms) {
Atom newAtom = Atom.create(
getTrackingDLPredicate(atom.getDLPredicate()),
DLClauseHelper.getArguments(atom));
newHeadAtoms.add(newAtom);
}
DLClause newClause;
for (int j = 0; j < headLength; ++j) {
Atom[] newBodyAtoms = new Atom[headLength + bodyAtoms.length + 1];
newBodyAtoms[0] = gapAtoms[j];
for (int i = 0; i < headLength; ++i)
// newBodyAtoms[i] = auxAtoms[i];
newBodyAtoms[i + 1] = auxAtoms[i];
for (int i = 0; i < bodyAtoms.length; ++i)
// newBodyAtoms[i + headLength] = bodyAtoms[i];
newBodyAtoms[i + headLength + 1] = bodyAtoms[i];
for (Atom atom: newHeadAtoms) {
newClause = DLClause.create(new Atom[] {atom}, newBodyAtoms);
addTrackingClause(newClause);
}
}
}
private void addTrackingClause(DLClause clause) {
trackingClauses.add(clause);
}
private void addDisjunctiveRule(DLClause clause) {
disjunctiveRules.add(clause);
}
protected DLPredicate generateAuxiliaryRule(AtLeastConcept p) {
AtomicConcept ac = AtomicConcept.create(Normalisation.getAuxiliaryConcept4Disjunct(p));
int num = p.getNumber();
Variable X = Variable.create("X");
Variable[] Ys = new Variable[num];
for (int i = 0; i < num; ++i) Ys[i] = Variable.create("Y" + (i + 1));
Collection<Atom> expandedAtom = new LinkedList<Atom>();
Collection<Atom> representativeAtom = new LinkedList<Atom>();
if (p.getOnRole() instanceof AtomicRole) {
AtomicRole r = (AtomicRole) p.getOnRole();
for (int i = 0; i < num; ++i)
expandedAtom.add(Atom.create(r, X, Ys[i]));
representativeAtom.add(Atom.create(r, X, Ys[0]));
}
else {
AtomicRole r = ((InverseRole) p.getOnRole()).getInverseOf();
for (int i = 0; i < num; ++i)
expandedAtom.add(Atom.create(r, Ys[i], X));
representativeAtom.add(Atom.create(r, Ys[0], X));
}
if (num > 1) {
representativeAtom.add(Atom.create(Inequality.INSTANCE, Ys[0], Ys[1]));
}
for (int i = 0; i < num; ++i)
for (int j = i + 1; j < num; ++i)
expandedAtom.add(Atom.create(Inequality.INSTANCE, Ys[i], Ys[j]));
if (!p.getToConcept().equals(AtomicConcept.THING)) {
AtomicConcept c;
if (p.getToConcept() instanceof AtomicConcept)
c = (AtomicConcept) p.getToConcept();
else
c = OverApproxExist.getNegationConcept(((AtomicNegationConcept) p.getToConcept()).getNegatedAtomicConcept());
for (int i = 0; i < num; ++i)
expandedAtom.add(Atom.create(c, Ys[i]));
representativeAtom.add(Atom.create(c, Ys[0]));
}
DLPredicate auxPredicate = getTrackingDLPredicate(ac);
DLPredicate gapPredicate = getGapDLPredicate(ac);
for (Atom atom: representativeAtom) {
Atom[] bodyAtoms = new Atom[expandedAtom.size() + 1];
bodyAtoms[0] = getAuxiliaryAtom(atom);
int i = 0;
for (Atom bodyAtom: expandedAtom)
bodyAtoms[++i] = bodyAtom;
addTrackingClause(DLClause.create(new Atom[] {Atom.create(auxPredicate, X)}, bodyAtoms));
bodyAtoms = new Atom[expandedAtom.size() + 1];
if (atom.getArity() == 1)
bodyAtoms[0] = Atom.create(getGapDLPredicate(atom.getDLPredicate()), atom.getArgument(0));
else
bodyAtoms[0] = Atom.create(getGapDLPredicate(atom.getDLPredicate()), atom.getArgument(0), atom.getArgument(1));
i = 0;
for (Atom bodyAtom: expandedAtom)
bodyAtoms[++i] = bodyAtom;
addTrackingClause(DLClause.create(new Atom[] {Atom.create(gapPredicate, X)}, bodyAtoms));
}
return auxPredicate;
}
private DLPredicate generateAuxiliaryRule(AtomicConcept p) {
return getTrackingDLPredicate(p);
}
private DLPredicate generateAuxiliaryRule(AtomicRole p) {
return getTrackingDLPredicate(p);
}
protected DLPredicate generateAuxiliaryRule(Equality instance) {
return getTrackingDLPredicate(AtomicRole.create(Namespace.EQUALITY));
}
protected DLPredicate generateAuxiliaryRule(Inequality instance) {
return getTrackingDLPredicate(AtomicRole.create(Namespace.INEQUALITY));
}
@Override
protected void encodingAtomicQuery(QueryRecord[] botQuerRecords) {
encodingAtomicQuery(botQuerRecords, true);
}
}
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