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package uk.ac.ox.cs.pagoda.owl;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
import org.semanticweb.HermiT.model.AnnotatedEquality;
import org.semanticweb.HermiT.model.Atom;
import org.semanticweb.HermiT.model.AtomicConcept;
import org.semanticweb.HermiT.model.AtomicRole;
import org.semanticweb.HermiT.model.DLClause;
import org.semanticweb.HermiT.model.DLPredicate;
import org.semanticweb.HermiT.model.Equality;
import org.semanticweb.HermiT.model.Inequality;
import org.semanticweb.HermiT.model.Term;
import org.semanticweb.HermiT.model.Variable;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLObjectHasValue;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectSomeValuesFrom;
import uk.ac.ox.cs.pagoda.summary.Summary;
import uk.ac.ox.cs.pagoda.util.Namespace;
import uk.ac.ox.cs.pagoda.util.Utility;
public class QueryRoller {
private OWLDataFactory factory;
protected Map<String, LinkedList<String>> edges, concepts;
public QueryRoller(OWLDataFactory factory) {
this.factory = factory;
}
private OWLClassExpression getOWLClassExpression(String u, String father, Set<String> visited) {
visited.add(u);
String[] temp;
Set<OWLClassExpression> exps = new HashSet<OWLClassExpression>();
OWLObjectPropertyExpression prop;
if (concepts.containsKey(u))
for (String concept: concepts.get(u)) {
exps.add(factory.getOWLClass(IRI.create(concept)));
}
if (edges.containsKey(u))
for (String pair: edges.get(u)) {
temp = pair.split(" ");
if (temp[0].startsWith("-"))
prop = factory.getOWLObjectInverseOf(factory.getOWLObjectProperty(IRI.create(temp[0].substring(1))));
else
prop = factory.getOWLObjectProperty(IRI.create(temp[0]));
if (temp[1].startsWith("@"))
exps.add(factory.getOWLObjectHasValue(prop, factory.getOWLNamedIndividual(IRI.create(OWLHelper.removeAngles(temp[1].substring(1))))));
else if (visited.contains(temp[1])) {
if (father != null && father.equals(temp[1]))
continue;
if (!u.equals(temp[1])) {
Utility.logError("The query cannot be rolled up!");
return null;
}
exps.add(factory.getOWLObjectHasSelf(prop));
}
else
exps.add(factory.getOWLObjectSomeValuesFrom(prop, getOWLClassExpression(temp[1], u, visited)));
}
if (exps.size() == 0)
return factory.getOWLThing();
if (exps.size() == 1)
return exps.iterator().next();
else
return factory.getOWLObjectIntersectionOf(exps);
}
String currentMainVariable;
public OWLClassExpression rollUp(DLClause query, String var) {
currentMainVariable = var;
query = removeSameAs(query);
edges = new HashMap<String, LinkedList<String>>();
concepts = new HashMap<String, LinkedList<String>>();
String arg1, arg2, predicate;
DLPredicate dlPredicate;
Term t1, t2;
for (Atom atom: query.getBodyAtoms()) {
dlPredicate = atom.getDLPredicate();
if (dlPredicate instanceof AtomicRole) {
arg1 = (t1 = atom.getArgument(0)).toString();
arg2 = (t2 = atom.getArgument(1)).toString();
predicate = ((AtomicRole) dlPredicate).getIRI();
if (!predicate.equals(Namespace.RDF_TYPE)) {
if (t1 instanceof Variable)
if (t2 instanceof Variable) {
addEntry(edges, arg1, predicate + " " + arg2);
addEntry(edges, arg2, "-" + predicate + " " + arg1);
}
else
addEntry(edges, arg1, predicate + " @" + arg2);
else
addEntry(edges, arg2, "-" + predicate + " @" + arg1);
}
else {
if (t2 instanceof Variable) return null;
addEntry(concepts, arg1, arg2);
}
}
else
addEntry(concepts, atom.getArgument(0).toString(), ((AtomicConcept) dlPredicate).getIRI());
}
return getOWLClassExpression(var, null, new HashSet<String>());
}
private DLClause removeSameAs(DLClause query) {
int equalityStatement = 0;
Map<Term, Term> ufs = new HashMap<Term, Term>();
for (Atom atom: query.getBodyAtoms())
if (isEquality(atom.getDLPredicate())) {
++equalityStatement;
merge(ufs, atom.getArgument(0), atom.getArgument(1));
}
if (equalityStatement == 0) return query;
Atom[] bodyAtoms = new Atom[query.getBodyLength() - equalityStatement];
int index = 0;
for (Atom atom: query.getBodyAtoms())
if (!isEquality(atom.getDLPredicate())) {
if (atom.getArity() == 1)
bodyAtoms[index++] = Atom.create(atom.getDLPredicate(), find(ufs, atom.getArgument(0)));
else
bodyAtoms[index++] = Atom.create(atom.getDLPredicate(), find(ufs, atom.getArgument(0)), find (ufs, atom.getArgument(1)));
}
return DLClause.create(query.getHeadAtoms(), bodyAtoms);
}
private boolean isEquality(DLPredicate p) {
return p instanceof Equality || p instanceof AnnotatedEquality || p instanceof Inequality
|| p.toString().equals(Namespace.EQUALITY_QUOTED)
|| p.toString().equals(Namespace.EQUALITY_ABBR);
}
private Term find(Map<Term, Term> ufs, Term u) {
Term v = u, w;
while ((w = ufs.get(v)) != null) v = w;
while ((w = ufs.get(u)) != null) {
ufs.put(u, v);
u = w;
}
return v;
}
private void merge(Map<Term, Term> ufs, Term u, Term v) {
u = find(ufs, u);
v = find(ufs, v);
if (compare(u, v) <= 0) ufs.put(v, u);
else ufs.put(u, v);
}
private int compare(Term u, Term v) {
int ret = rank(u) - rank(v);
if (ret != 0) return ret;
else
return u.toString().compareTo(v.toString());
}
private int rank(Term u) {
if (u instanceof Variable) {
Variable v = (Variable) u;
if (v.getName().equals(currentMainVariable))
return 0;
else
return 2;
}
return 1;
}
private void addEntry(Map<String, LinkedList<String>> map, String key, String value) {
LinkedList<String> list;
if ((list = map.get(key)) == null) {
list = new LinkedList<String>();
map.put(key, list);
}
list.add(value);
}
@Deprecated
public OWLClassExpression summarise(Summary sum, OWLClassExpression exp) {
if (exp == null) return null;
Set<OWLClassExpression> exps = exp.asConjunctSet();
if (exps.size() == 1) {
OWLClassExpression tempExp = exps.iterator().next();
// TODO reference: getOWLClassExpression(String)
if (tempExp instanceof OWLObjectHasValue) {
OWLObjectHasValue hasValue = (OWLObjectHasValue) tempExp;
OWLNamedIndividual individual = sum.getRepresentativeIndividual(hasValue.getValue().toStringID());
return factory.getOWLObjectHasValue(hasValue.getProperty(), individual);
}
if (tempExp instanceof OWLObjectSomeValuesFrom) {
OWLObjectSomeValuesFrom someValuesFrom = (OWLObjectSomeValuesFrom) tempExp;
return factory.getOWLObjectSomeValuesFrom(someValuesFrom.getProperty(), summarise(sum, someValuesFrom.getFiller()));
}
return tempExp;
}
Set<OWLClassExpression> newExps = new HashSet<OWLClassExpression>();
for (OWLClassExpression clsExp: exps)
newExps.add(summarise(sum, clsExp));
return factory.getOWLObjectIntersectionOf(newExps);
}
}
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