/**
* Create statements from query.
*
* @param Query $queryObject Query object which represents a SPARQL query.
* @return StatementIterator StatementIterator object
*/
protected function getStatements(Query $queryObject)
{
$queryParts = $queryObject->getQueryParts();
$statementArray = array();
// if only triples, but no quads
if (true === isset($queryParts['triple_pattern']) && false === isset($queryParts['quad_pattern'])) {
foreach ($queryParts['triple_pattern'] as $pattern) {
/**
* Create Node instances for S, P and O to build a Statement instance later on
*/
$s = $this->createNodeByValueAndType($pattern['s'], $pattern['s_type']);
$p = $this->createNodeByValueAndType($pattern['p'], $pattern['p_type']);
$o = $this->createNodeByValueAndType($pattern['o'], $pattern['o_type']);
$g = null;
$statementArray[] = $this->statementFactory->createStatement($s, $p, $o, $g);
}
// if only quads, but not triples
} elseif (false === isset($queryParts['triple_pattern']) && true === isset($queryParts['quad_pattern'])) {
foreach ($queryParts['quad_pattern'] as $pattern) {
/**
* Create Node instances for S, P and O to build a Statement instance later on
*/
$s = $this->createNodeByValueAndType($pattern['s'], $pattern['s_type']);
$p = $this->createNodeByValueAndType($pattern['p'], $pattern['p_type']);
$o = $this->createNodeByValueAndType($pattern['o'], $pattern['o_type']);
$g = $this->createNodeByValueAndType($pattern['g'], $pattern['g_type']);
$statementArray[] = $this->statementFactory->createStatement($s, $p, $o, $g);
}
// found quads and triples
} elseif (true === isset($queryParts['triple_pattern']) && true === isset($queryParts['quad_pattern'])) {
throw new \Exception('Query contains quads and triples. That is not supported yet.');
// neither quads nor triples
} else {
throw new \Exception('Query contains neither quads nor triples.');
}
return $this->statementIteratorFactory->createIteratorFromArray($statementArray);
}
