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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.reasoner.light.BasicQueryEngine;
import uk.ac.ox.cs.pagoda.rules.UpperDatalogProgram;
import uk.ac.ox.cs.pagoda.rules.approximators.SkolemTermsManager;
import uk.ac.ox.cs.pagoda.util.Namespace;
import java.util.*;
public abstract class TrackingRuleEncoderDisj extends TrackingRuleEncoderWithGap {
public TrackingRuleEncoderDisj(UpperDatalogProgram program, BasicQueryEngine store) {
super(program, store);
}
protected Map<DLClause, Collection<DLClause>> disjunctiveRules = new HashMap<DLClause, Collection<DLClause>>();
/**
*
*/
protected void processDisjunctiveRules() {
Map<Atom, Collection<DLClause>> auxiliaryAtoms = new HashMap<Atom, Collection<DLClause>>();
Map<Individual, Collection<DLClause>> skolemisedAtoms = new HashMap<Individual, Collection<DLClause>>();
SkolemTermsManager termsManager = SkolemTermsManager.getInstance();
for (Map.Entry<DLClause, Collection<DLClause>> entry: disjunctiveRules.entrySet()) {
DLClause original = entry.getKey();
Collection<DLClause> overClauses = entry.getValue();
int index = 0;
for (Iterator<DLClause> iter = overClauses.iterator(); iter.hasNext();) {
DLClause subClause = iter.next();
if (DLClauseHelper.hasSubsetBodyAtoms(subClause, original)) {
Atom headAtom = subClause.getHeadAtom(0);
if ((index = SkolemTermsManager.indexOfSkolemisedIndividual(headAtom)) != -1) {
Individual i = (Individual) headAtom.getArgument(index);
Collection<DLClause> clauses = skolemisedAtoms.get(i);
if (clauses == null) {
clauses = new HashSet<DLClause>();
skolemisedAtoms.put(i, clauses);
}
clauses.add(subClause);
}
else
auxiliaryAtoms.put(getAuxiliaryAtom(original, subClause.getHeadAtom(0)), Collections.singleton(subClause));
}
else
super.encodingRule(subClause);
}
for (Atom headAtom: original.getHeadAtoms())
if (headAtom.getDLPredicate() instanceof AtLeastConcept) {
AtLeastConcept alc = (AtLeastConcept) headAtom.getDLPredicate();
Collection<DLClause> clauses = new HashSet<DLClause>();
Individual[] individuals = new Individual[alc.getNumber()];
for (int i = 0; i < alc.getNumber(); ++i) {
individuals[i] = termsManager.getFreshIndividual(original, i);
clauses.addAll(skolemisedAtoms.get(individuals[i]));
}
auxiliaryAtoms.put(getAuxiliaryAtom(original, headAtom, individuals), clauses);
}
index = 0;
Atom[] auxAtoms = auxiliaryAtoms.keySet().toArray(new Atom[0]);
for (Atom atom: auxAtoms) {
for (DLClause subClause: auxiliaryAtoms.get(atom))
encodingDisjunctiveRule(subClause, index, auxAtoms);
index++;
}
auxiliaryAtoms.clear();
}
}
private Atom getAuxiliaryAtom(DLClause original, Atom headAtom, Individual... individuals) {
DLPredicate p = headAtom.getDLPredicate();
if (p instanceof AtLeastConcept) {
// AtLeastConcept alc = (AtLeastConcept) p;
// Individual[] individuals = new Individual[alc.getNumber()];
// for (int i = 0; i < alc.getNumber(); ++i)
// individuals[i] = OverApproxExist.getNewIndividual(original, i);
return Atom.create(generateAuxiliaryRule((AtLeastConcept) p, original, individuals), 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 void encodingDisjunctiveRule(DLClause clause, int index, Atom[] auxAtoms) {
int validHeadLength = auxAtoms.length;
Atom headAtom = clause.getHeadAtom(0);
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;
Atom[] newBodyAtoms = new Atom[bodyAtoms.length + validHeadLength + 1];
newBodyAtoms[0] = Atom.create(
getTrackingDLPredicate(headAtom.getDLPredicate()),
DLClauseHelper.getArguments(headAtom));
newBodyAtoms[1] = Atom.create(
getGapDLPredicate(headAtom.getDLPredicate()),
DLClauseHelper.getArguments(headAtom));
for (int i = 0; i < validHeadLength; ++i)
if (i != index)
newBodyAtoms[i + (i < index ? 2 : 1)] = auxAtoms[i];
for (int i = 0; i < bodyAtoms.length; ++i)
newBodyAtoms[i + validHeadLength + 1] = bodyAtoms[i];
for (Atom atom: newHeadAtoms) {
newClause = DLClause.create(new Atom[] {atom}, newBodyAtoms);
addTrackingClause(newClause);
}
}
protected void addTrackingClause(DLClause clause) {
trackingClauses.add(clause);
}
protected void addDisjunctiveRule(DLClause key, DLClause clause) {
Collection<DLClause> value = disjunctiveRules.get(key);
if (value == null) {
value = new LinkedList<DLClause>();
disjunctiveRules.put(key, value);
}
value.add(clause);
}
protected abstract DLPredicate generateAuxiliaryRule(AtLeastConcept p, DLClause original, Individual[] individuals);
protected abstract DLPredicate generateAuxiliaryRule(AtomicRole p);
protected abstract DLPredicate generateAuxiliaryRule(AtomicConcept p);
protected DLPredicate generateAuxiliaryRule(Equality instance) {
return generateAuxiliaryRule(AtomicRole.create(Namespace.EQUALITY));
}
protected abstract DLPredicate generateAuxiliaryRule(Inequality instance);
}
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