private void populateBindingSets(
List<QueryBindingSet> results, Var predVar, Var objVar, Collection<Statement> stmts) {
if (predVar == null || objVar == null || stmts == null || stmts.size() == 0) return;
List<QueryBindingSet> copyOf = new ArrayList<QueryBindingSet>(results);
int i = copyOf.size();
int j = 0;
for (Iterator<Statement> iter = stmts.iterator(); iter.hasNext(); ) {
Statement st = iter.next();
int k = 0;
for (QueryBindingSet result : results) {
if (!result.hasBinding(predVar.getName()) || k >= i) {
String name = predVar.getName();
org.openrdf.model.Value val = st.getPredicate();
addBinding(result, name, val);
}
if (!result.hasBinding(objVar.getName()) || k >= i)
addBinding(result, objVar.getName(), st.getObject());
k++;
}
i = copyOf.size() + j * copyOf.size();
j++;
if (iter.hasNext()) {
// copy results
for (QueryBindingSet copy : copyOf) {
results.add(new QueryBindingSet(copy));
}
}
}
}
@Override
protected BindingSet getNextElement() throws QueryEvaluationException {
if (hashTable == null) {
setupHashTable();
}
while (currentScanElem == null) {
if (scanList.size() > 0) {
currentScanElem = scanList.remove(0);
} else {
if (restIter.hasNext()) {
currentScanElem = restIter.next();
} else {
// no more elements available
return null;
}
}
if (currentScanElem instanceof EmptyBindingSet) {
// the empty bindingset should be merged with all bindingset in
// the hash table
hashTableValues = new ArrayList<BindingSet>();
for (BindingSet key : hashTable.keySet()) {
hashTableValues.addAll(hashTable.get(key));
}
} else {
BindingSet key = calcKey(currentScanElem, joinAttributes);
if (hashTable.containsKey(key)) {
hashTableValues = new ArrayList<BindingSet>(hashTable.get(key));
} else {
currentScanElem = null;
hashTableValues = null;
}
}
}
BindingSet nextHashTableValue = hashTableValues.remove(0);
QueryBindingSet result = new QueryBindingSet(currentScanElem);
for (String name : nextHashTableValue.getBindingNames()) {
Binding b = nextHashTableValue.getBinding(name);
if (!result.hasBinding(name)) {
result.addBinding(b);
}
}
if (hashTableValues.size() == 0) {
// we've exhausted the current scanlist entry
currentScanElem = null;
hashTableValues = null;
}
return result;
}
private BindingSet calcKey(BindingSet bindings, Set<String> commonVars) {
QueryBindingSet q = new QueryBindingSet();
for (String varName : commonVars) {
Binding b = bindings.getBinding(varName);
if (b != null) {
q.addBinding(b);
}
}
return q;
}
protected BindingSet populateBindingSet(Statement st, List<Map.Entry<Var, Var>> predObjVar) {
QueryBindingSet result = new QueryBindingSet(bindings);
for (Map.Entry<Var, Var> entry : predObjVar) {
Var predVar = entry.getKey();
Var objVar = entry.getValue();
if (predVar != null && !result.hasBinding(predVar.getName()))
result.addBinding(predVar.getName(), st.getPredicate());
if (objVar != null && !result.hasBinding(objVar.getName()))
result.addBinding(objVar.getName(), st.getObject());
}
return result;
}
@Override
protected BindingSet convert(BindingSet bIn) throws QueryEvaluationException {
QueryBindingSet res = new QueryBindingSet();
int bIndex = -1;
Iterator<Binding> bIter = bIn.iterator();
while (bIter.hasNext()) {
Binding b = bIter.next();
String name = b.getName();
bIndex = Integer.parseInt(name.substring(name.lastIndexOf("_") + 1));
res.addBinding(name.substring(0, name.lastIndexOf("_")), b.getValue());
}
if (bIndex > -1) res.addAll(bindings.get(bIndex));
return res;
}
public static BindingSet project(
ProjectionElemList projElemList, BindingSet sourceBindings, BindingSet parentBindings) {
QueryBindingSet resultBindings = new QueryBindingSet(parentBindings);
for (ProjectionElem pe : projElemList.getElements()) {
Value targetValue = sourceBindings.getValue(pe.getSourceName());
if (targetValue != null) {
// Potentially overwrites bindings from super
resultBindings.setBinding(pe.getTargetName(), targetValue);
}
}
return resultBindings;
}
protected List<QueryBindingSet> populateBindingSet(
List<Statement> document, Var subjVar, List<Map.Entry<Var, Var>> predObjVar) {
// convert document to a multimap
Multimap<URI, Statement> docMap = ArrayListMultimap.create();
for (Statement st : document) {
docMap.put(st.getPredicate(), st);
}
List<QueryBindingSet> results = new ArrayList<QueryBindingSet>();
QueryBindingSet bs0 = new QueryBindingSet(bindings);
// QueryBindingSet result = new QueryBindingSet(bindings);
if (document.size() > 0) {
Statement stmt = document.get(0);
if (subjVar != null && !bs0.hasBinding(subjVar.getName())) {
bs0.addBinding(subjVar.getName(), stmt.getSubject());
}
}
results.add(bs0);
// for (Statement st : document) {
for (Map.Entry<Var, Var> entry : predObjVar) {
Var predVar = entry.getKey();
Var objVar = entry.getValue();
// if (predVar.hasValue() && !st.getPredicate().equals(predVar.getValue()))
// continue;
if (predVar == null || !predVar.hasValue()) continue;
Collection<Statement> predSts = docMap.get((URI) predVar.getValue());
// if (predVar != null && !result.hasBinding(predVar.getName()))
// result.addBinding(predVar.getName(), st.getPredicate());
// if (objVar != null && !result.hasBinding(objVar.getName()))
// result.addBinding(objVar.getName(), st.getObject());
populateBindingSets(results, predVar, objVar, predSts);
}
// }
return results;
}
private void addBinding(QueryBindingSet result, String name, org.openrdf.model.Value val) {
if (result.hasBinding(name)) result.removeBinding(name);
result.addBinding(name, val);
}
