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;
}
private Triple resolveTriple(final Triple t, final Binding values) {
int idx = variables.indexOf(t.getSubject());
final Node s = idx == -1 ? t.getSubject() : values.get(Var.alloc(variables.get(idx)));
idx = variables.indexOf(t.getPredicate());
final Node p = idx == -1 ? t.getPredicate() : values.get(Var.alloc(variables.get(idx)));
idx = variables.indexOf(t.getObject());
final Node o = idx == -1 ? t.getObject() : values.get(Var.alloc(variables.get(idx)));
return new Triple(s, p, o);
}
@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;
}
@Test
public void testSetVars() {
Var v = Var.alloc("v");
Triple t = new Triple(NodeFactory.createURI("one"), NodeFactory.createURI("two"), v);
handler.addConstruct(t);
Template template = query.getConstructTemplate();
assertNotNull(template);
List<Triple> lst = template.getTriples();
assertEquals(1, lst.size());
assertEquals(t, lst.get(0));
Map<Var, Node> values = new HashMap<Var, Node>();
values.put(v, NodeFactory.createURI("three"));
handler.setVars(values);
template = query.getConstructTemplate();
assertNotNull(template);
lst = template.getTriples();
assertEquals(1, lst.size());
t =
new Triple(
NodeFactory.createURI("one"),
NodeFactory.createURI("two"),
NodeFactory.createURI("three"));
assertEquals(t, lst.get(0));
}
@Override
public QueryIterator execOneList(
Binding binding, Node listNode, Node predicate, Node length, ExecutionContext execCxt) {
Graph graph = execCxt.getActiveGraph();
if (Var.isVar(listNode))
throw new ARQInternalErrorException("listLength: Subject is a variable");
// Case : arg 1 (the list) is bound and arg 2 not bound => generate possibilities
// Case : arg 1 is bound and arg 2 is bound => test for membership.
if (Var.isVar(length)) return length(binding, graph, listNode, Var.alloc(length), execCxt);
else return verify(binding, graph, listNode, length, execCxt);
}
@Override
protected QueryIterator execObjectBound(
Binding binding, Var listVar, Node predicate, Node length, ExecutionContext execCxt) {
Graph graph = execCxt.getActiveGraph();
return length(binding, graph, listVar, Var.alloc(length), execCxt);
}