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package uk.ac.ox.cs.pagoda.constraints;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import org.semanticweb.HermiT.model.Atom;
import org.semanticweb.HermiT.model.AtomicConcept;
import org.semanticweb.HermiT.model.DLClause;
import org.semanticweb.HermiT.model.Term;
import org.semanticweb.HermiT.model.Variable;
public class UpperUnaryBottom extends UnaryBottom {
static final Variable X = Variable.create("X");
Map<DLClause, Integer> number = new HashMap<DLClause, Integer>();
@Override
public Collection<DLClause> process(Collection<DLClause> clauses) {
Collection<DLClause> ret = new LinkedList<DLClause>();
for (DLClause clause: clauses)
if (clause.getHeadLength() == 0) {
ret.add(DLClause.create(getEmptyHead(pickRepresentative(clause.getBodyAtoms()), clause), clause.getBodyAtoms()));
ret.add(DLClause.create(getEmptyHead(X), getEmptyHead(X, clause)));
}
else
ret.add(clause);
return ret;
}
@Override
public boolean isBottomRule(DLClause clause) {
return clause.getHeadLength() == 1 && clause.getHeadAtom(0).getDLPredicate().toString().contains(AtomicConcept.NOTHING.toString());
}
public Atom[] getEmptyHead(Term t, DLClause clause) {
Integer index = number.get(clause);
if (index == null) {
number.put(clause, index = number.size() + 1);
}
return new Atom[] {Atom.create(AtomicConcept.create(AtomicConcept.NOTHING.getIRI() + index), t)};
}
@Override
public int getBottomNumber() {
return number.size() + 1;
}
}
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