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package uk.ac.ox.cs.pagoda.query;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
import uk.ac.ox.cs.pagoda.reasoner.light.BasicQueryEngine;
import uk.ac.ox.cs.pagoda.util.UFS;
import uk.ac.ox.cs.JRDFox.JRDFStoreException;
import uk.ac.ox.cs.JRDFox.store.TupleIterator;
public class GapByStore4ID2 extends GapByStore4ID {
private BasicQueryEngine m_baseEngine;
private UFS<String> m_equality = null, m_baseEquality = null;
public GapByStore4ID2(BasicQueryEngine engine, BasicQueryEngine baseEngine) {
super(engine);
m_baseEngine = baseEngine;
}
@Override
public boolean hasNext() {
if (getNewGapTuple(iterator, -1)) return true;
if (iterator != null) {
iterator.dispose();
iterator = null;
}
return getNextGapFactAboutEquality();
}
private boolean getNewGapTuple(TupleIterator it, int firstElement) {
if (it == null) return false;
int firstIndex = 0;
tuple = new int[3];
if (firstElement > 0) {
tuple[0] = firstElement;
firstIndex = 1;
}
Integer predicate;
try {
for (; multi != 0; multi = it.getNext()) {
for (int i = firstIndex; i < 3; ++i)
tuple[i] = (int) it.getResourceID(i - firstIndex);
if (isRDF_TYPE()) {
predicate = getGapPredicateID(tuple[2]);
if (predicate == null) continue;
tuple[2] = predicate;
}
else {
predicate = getGapPredicateID(tuple[1]);
if (predicate == null) continue;
tuple[1] = predicate;
}
return true;
}
} catch (JRDFStoreException e) {
e.printStackTrace();
return false;
}
return false;
}
private LinkedList<String> toAddedIndividuals = null;
private TupleIterator iter_individual = null;
private int currentID = -1;
private boolean getNextGapFactAboutEquality() {
if (toAddedIndividuals == null) {
m_equality = m_engine.getEqualityGroups(false);
m_baseEquality = m_baseEngine.getEqualityGroups(false);
toAddedIndividuals = new LinkedList<String>();
Map<String, Integer> rep2cnt = new HashMap<String, Integer>();
Map<String, Integer> rep2cnt_base = new HashMap<String, Integer>();
count(m_engine, m_equality, rep2cnt);
count(m_baseEngine, m_baseEquality, rep2cnt_base);
Set<String> visitedrep = new HashSet<String>();
for (String individual : m_equality.keySet()) {
String rep = m_equality.find(individual);
if (visitedrep.contains(rep)) continue;
visitedrep.add(rep);
String rep_base = m_baseEquality.find(individual);
if (!rep2cnt.get(rep).equals(rep2cnt_base.get(rep_base))) {
toAddedIndividuals.add(rep);
}
}
}
while (true) {
if (getNewGapTuple(iter_individual, currentID)) return true;
if (iter_individual != null) {
iter_individual.dispose();
iter_individual = null;
}
if (toAddedIndividuals.isEmpty()) {
currentID = -1;
return false;
}
String individual = toAddedIndividuals.remove();
currentID = tripleManager.getResourceID(individual);
try {
iter_individual = m_engine.internal_evaluateNotExpanded(String.format("select distinct ?y ?z where { <%s> ?y ?z }", individual));
multi = iter_individual.open();
} catch (JRDFStoreException e) {
e.printStackTrace();
}
}
}
private void count(BasicQueryEngine engine, UFS<String> equality, Map<String, Integer> map) {
for (String ind : equality.keySet()) {
Integer exist = map.get(ind);
if (exist == null)
map.put(equality.find(ind), 1);
else
map.put(equality.find(ind), ++exist);
}
}
@Override
public int[] next() {
try {
if (iterator != null)
multi = iterator.getNext();
else if (iter_individual != null)
multi = iter_individual.getNext();
else
multi = 0;
} catch (JRDFStoreException e) {
e.printStackTrace();
}
return tuple;
}
public void clear() {
super.clear();
if (iter_individual != null) {
iter_individual.dispose();
iter_individual = null;
}
}
}
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