@Override
public IExtendedIterator<IStatement> match(
IReference subject,
IReference predicate,
IValue object,
boolean includeInferred,
IReference... contexts) {
String query;
if (contexts.length > 0 && !includeInferred) {
query = "SELECT DISTINCT ?s ?p ?o ?g WHERE { GRAPH ?g { ?s ?p ?o } }";
} else {
query = "SELECT DISTINCT ?s ?p ?o WHERE { ?s ?p ?o }";
}
IDataManagerQuery<?> dmQuery = createQuery(query, null, includeInferred, contexts);
setParameters(dmQuery, subject, predicate, object);
return dmQuery
.evaluate()
.mapWith(
new IMap<Object, IStatement>() {
@Override
public IStatement map(Object value) {
IBindings<?> bindings = (IBindings<?>) value;
return new Statement(
(IReference) bindings.get("s"),
(IReference) bindings.get("p"),
bindings.get("o"),
(IReference) bindings.get("g"));
}
});
}
protected void setParameters(
IDataManagerQuery<?> query, IReference subject, IReference predicate, IValue object) {
if (subject != null) {
query.setParameter("s", subject);
}
if (predicate != null) {
query.setParameter("p", predicate);
}
if (object != null) {
query.setParameter("o", object);
}
}
@Override
public boolean hasMatch(
IReference subject,
IReference predicate,
IValue object,
boolean includeInferred,
IReference... contexts) {
String query;
if (contexts.length > 0 && !includeInferred) {
query = "ASK { GRAPH ?g { ?s ?p ?o } }";
} else {
query = "ASK { ?s ?p ?o }";
}
IDataManagerQuery<?> dmQuery = createQuery(query, null, includeInferred, contexts);
setParameters(dmQuery, subject, predicate, object);
Object result = dmQuery.evaluate().next();
return Boolean.TRUE.equals(result);
}
