/**
* Serialize the model as a string.
*
* @param LibRDF_Serializer $serializer The serializer to use
* @param string $base_uri The base URI to use if relative URIs are desired
* @return string The model as a string
* @throws LibRDF_Error If unable to serialize the model
* @access public
*/
public function serializeStatements(LibRDF_Serializer $serializer, $base_uri = NULL)
{
if ($base_uri) {
$base_uri = new LibRDF_URI($base_uri);
}
$ret = librdf_serializer_serialize_model_to_string($serializer->getSerializer(), $base_uri ? $base_uri->getURI() : $base_uri, $this->model);
if (!$ret) {
throw new LibRDF_Error("Unable to serialize model");
} else {
return $ret;
}
}
function CONSTRUCT($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;
}
