private QueryIterator resultsToQueryIterator(
Binding binding,
Node s,
Node score,
Node literal,
Collection<TextHit> results,
ExecutionContext execCxt) {
Var sVar = Var.isVar(s) ? Var.alloc(s) : null;
Var scoreVar = (score == null) ? null : Var.alloc(score);
Var literalVar = (literal == null) ? null : Var.alloc(literal);
Function<TextHit, Binding> converter =
(TextHit hit) -> {
if (score == null && literal == null)
return sVar != null
? BindingFactory.binding(binding, sVar, hit.getNode())
: BindingFactory.binding(binding);
BindingMap bmap = BindingFactory.create(binding);
if (sVar != null) bmap.add(sVar, hit.getNode());
if (scoreVar != null) bmap.add(scoreVar, NodeFactoryExtra.floatToNode(hit.getScore()));
if (literalVar != null) bmap.add(literalVar, hit.getLiteral());
return bmap;
};
Iterator<Binding> bIter = Iter.map(results.iterator(), converter);
QueryIterator qIter = new QueryIterPlainWrapper(bIter, execCxt);
return qIter;
}
@Override
public QueryIterator execEvaluated(
final Binding binding,
PropFuncArg argSubject,
Node predicate,
PropFuncArg argObject,
ExecutionContext execCxt) {
// check subject is a variable.
if (!argSubject.getArg().isVariable()) throw new QueryExecException("Subject not a variable");
final Var var = Var.alloc(argSubject.getArg());
if (!argObject.getArg().isLiteral()) throw new QueryExecException("Subject not a literal");
String searchTerm = argObject.getArg().getLiteralLexicalForm();
Search search = searchEngine();
Iterator<String> x = search.search(searchTerm);
Iter<String> iter = Iter.iter(x);
QueryIterator qIter =
new QueryIterPlainWrapper(
iter.map(
(item) -> {
return BindingFactory.binding(binding, var, NodeFactory.createURI(item));
}));
return qIter;
}
private static Set<SqlTable> tables(Set<SqlColumn> cols) {
return Iter.toSet(Iter.map(cols.iterator(), SqlColumn::getTable));
}