function CONSTRUCT($query, $base_uri = null)
{
if (is_null($base_uri)) {
$base_uri = $this->_base_uri;
}
timings($query);
$q = librdf_new_query($this->_world, 'sparql', null, $query, $base_uri);
$r = librdf_model_query_execute($this->_model, $q);
$r_stream = librdf_query_results_as_stream($r);
$r_store = librdf_new_storage($this->_world, 'memory', '', null);
$r_model = librdf_new_model($this->_world, $r_store, null);
librdf_model_add_statements($r_model, $r_stream);
librdf_free_stream($r_stream);
$serializer = librdf_new_serializer($this->_world, 'json', null, null);
$r = librdf_serializer_serialize_model_to_string($serializer, null, $r_model);
librdf_free_serializer($serializer);
$r = json_decode($r, 1);
if (is_null($r)) {
$r = array();
}
librdf_free_model($r_model);
librdf_free_storage($r_store);
librdf_free_query($q);
timings();
return $r;
}
/**
* Free the query resources.
*
* @return void
* @access public
*/
public function __destruct()
{
if ($this->query) {
librdf_free_query($this->query);
}
}