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package uk.ac.ox.cs.pagoda.query;
import org.semanticweb.HermiT.model.*;
import uk.ac.ox.cs.JRDFox.JRDFStoreException;
import uk.ac.ox.cs.JRDFox.Prefixes;
import uk.ac.ox.cs.JRDFox.store.DataStore;
import uk.ac.ox.cs.JRDFox.store.Parameters;
import uk.ac.ox.cs.JRDFox.store.TupleIterator;
import uk.ac.ox.cs.pagoda.MyPrefixes;
import uk.ac.ox.cs.pagoda.owl.OWLHelper;
import uk.ac.ox.cs.pagoda.reasoner.light.BasicQueryEngine;
import uk.ac.ox.cs.pagoda.reasoner.light.RDFoxTripleManager;
import uk.ac.ox.cs.pagoda.util.Namespace;
import uk.ac.ox.cs.pagoda.util.Utility;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Collection;
public class GapByTriple extends GapTupleIterator<String> {
static final String allTripleQuery = "SELECT ?X ?Y ?Z WHERE { ?X ?Y ?Z }";
private static final String RDF_TYPE = Namespace.RDF_NS + "type";
private static final String BRIEF_RDF_TYPE = "rdf:type";
DataStore lowerStore, upperStore;
long multi;
TupleIterator iterator;
String sub, obj, predicate;
// GroundTerm subTerm, objTerm;
Prefixes prefixes;
Parameters parameters;
public GapByTriple(BasicQueryEngine lowerStore, BasicQueryEngine upperStore) {
this.lowerStore = lowerStore.getDataStore();
this.upperStore = upperStore.getDataStore();
prefixes = MyPrefixes.PAGOdAPrefixes.getRDFoxPrefixes();
parameters = new Parameters();
}
public void compile(Collection<DLClause> clauses) throws JRDFStoreException {
iterator = this.upperStore.compileQuery(allTripleQuery, prefixes, parameters);
multi = iterator.open();
}
@Override
public boolean hasNext() {
TupleIterator iter = null;
boolean inGap;
StringBuffer queryBuffer = new StringBuffer();
try {
for (; multi != 0; multi = iterator.getNext()) {
// iterator.getRawGroundTerm(0);
// iterator.getRawGroundTerm(1);
// iterator.getRawGroundTerm(2);
sub = RDFoxTripleManager.getQuotedTerm(iterator.getResource(0));
predicate = RDFoxTripleManager.getQuotedTerm(iterator.getResource(1));
obj = RDFoxTripleManager.getQuotedTerm(iterator.getResource(2));
if (!obj.startsWith("<")) {
// This fragment of code ignores data types assertions.
// Utility.LOGS.info(sub + " " + predicate + " " + obj);
continue;
}
queryBuffer.setLength(0);
queryBuffer.append("SELECT WHERE { ").append(sub).append(" ").append(predicate).append(" ").append(obj).append(" }");
try {
iter = lowerStore.compileQuery(queryBuffer.toString(), prefixes, parameters);
inGap = iter.open() != 0;
} finally {
if (iter != null) iter.dispose();
iter = null;
}
if (inGap)
return true;
}
} catch (JRDFStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
@Override
public String next() {
try {
multi = iterator.getNext();
} catch (JRDFStoreException e) {
e.printStackTrace();
}
StringBuilder sb = new StringBuilder();
if (isRDF_TYPE()) {
sb.append(sub).append(" ").append(predicate).append(" ").append(getGapPredicate(obj)).append(".");
}
else sb.append(sub).append(" ").append(getGapPredicate(predicate)).append(" ").append(obj).append(".");
return sb.toString();
}
private boolean isRDF_TYPE() {
return predicate.equals(RDF_TYPE) || predicate.equals(BRIEF_RDF_TYPE);
}
@Override
public void remove() {
Utility.logError("Unsupported operation!");
}
public void save(String file) {
int tupleCounter = 0;
try {
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));
String tuple;
while (hasNext()) {
tuple = next();
writer.write(tuple);
writer.newLine();
++tupleCounter;
}
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
Utility.logError("There are " + tupleCounter + " tuples in the gap between lower and upper bound materialisation.");
}
public void addTo(DataStore store) throws JRDFStoreException {
int tupleCounter = 0;
RDFoxTripleManager tripleManager = new RDFoxTripleManager(store, false);
while (hasNext()) {
multi = iterator.getNext();
++tupleCounter;
if (isRDF_TYPE()) {
obj = OWLHelper.removeAngles(obj);
tripleManager.addTripleByTerm(
Atom.create(AtomicConcept.create(getGapPredicate(obj)), Individual.create(sub)));
}
else {
predicate = OWLHelper.removeAngles(predicate);
tripleManager.addTripleByTerm(
Atom.create(AtomicRole.create(getGapPredicate(predicate)), Individual.create(sub), Individual.create(obj)));
}
if (tupleCounter % 10000 == 0)
Utility.logDebug(tupleCounter);
}
Utility.logDebug("There are " + tupleCounter + " tuples in the gap between lower and upper bound materialisation.");
}
@Override
public void addBackTo() throws JRDFStoreException {
addTo(upperStore);
}
@Override
public void clear() {
iterator.dispose();
}
}
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