/**
* Constructs a result graph.
*
* @param Array $vartable a table containing the result vars and their bindings
* @param GraphPattern $constructPattern the CONSTRUCT pattern
* @return MemModel the result graph which matches the CONSTRUCT pattern
*/
protected function constructGraph($vartable, $constructPattern)
{
$resultGraph = new MemModel();
if (!$vartable) {
return $resultGraph;
}
$tp = $constructPattern->getTriplePattern();
$bnode = 0;
foreach ($vartable as $value) {
foreach ($tp as $triple) {
$sub = $triple->getSubject();
$pred = $triple->getPredicate();
$obj = $triple->getObject();
if (is_string($sub) && $sub[1] == '_') {
$sub = new BlankNode("_bN" . $bnode);
}
if (is_string($pred) && $pred[1] == '_') {
$pred = new BlankNode("_bN" . $bnode);
}
if (is_string($obj) && $obj[1] == '_') {
$obj = new BlankNode("_bN" . $bnode);
}
if (is_string($sub)) {
$sub = $value[$sub];
}
if (is_string($pred)) {
$pred = $value[$pred];
}
if (is_string($obj)) {
$obj = $value[$obj];
}
if ($sub != "" && $pred != "" && $obj != "") {
$resultGraph->add(new Statement($sub, $pred, $obj));
}
}
$bnode++;
}
return $resultGraph;
}
