/**
* Get the statement's object.
*
* @return LibRDF_Node The statement's object
* @access public
*/
public function getObject()
{
$node = librdf_statement_get_object($this->statement);
$object = LibRDF_Node::makeNode(librdf_new_node_from_node($node));
return $object;
}
/**
* Return the current node or NULL if the iterator is no longer valid.
*
* @return LibRDF_Statement The current node on the iterator
* @access public
*/
public function current()
{
if ($this->isvalid and !librdf_iterator_end($this->iterator)) {
// the pointer returned is overwritten when the iterator is
// advanced or closed, so make a copy of the node
$ret = librdf_iterator_get_object($this->iterator);
if ($ret) {
return LibRDF_Node::makeNode(librdf_new_node_from_node($ret));
} else {
throw new LibRDF_Error("Unable to get current node");
}
} else {
return NULL;
}
}
/**
* Return target nodes that are part of a statement containing the
* given source and predicate.
*
* @param LibRDF_Node $source The source node for which to search
* @param LibRDF_Node $arc The predicate node for which to search
* @return LibRDF_Iterator An iterator for nodes that matches the criteria
* @throws LibRDF_LookupError If no statement with the given source and predicate is found
* @access public
*/
public function getTargets(LibRDF_Node $source, LibRDF_Node $arc)
{
$targets = librdf_model_get_targets($this->model, $source->getNode(), $arc->getNode());
if ($targets) {
return new LibRDF_Iterator($targets, $this);
} else {
throw new LibRDF_Error("Failed to create iterator");
}
}
/**
* Return the current tuple of bindings.
*
* The result is an associative array using the binding names as the
* indices.
*
* @return array The current bindings tuple
* @throws LibRDF_Error If unable to get the current bindings tuple
* @access public
*/
public function current()
{
if ($this->isvalid and !librdf_query_results_finished($this->query_results)) {
$retarr = array();
$numbindings = librdf_query_results_get_bindings_count($this->query_results);
if ($numbindings < 0) {
throw new LibRDF_Error("Unable to get number of bindings in result");
}
for ($i = 0; $i < $numbindings; $i++) {
$key = librdf_query_results_get_binding_name($this->query_results, $i);
$value = librdf_query_results_get_binding_value($this->query_results, $i);
if (!$key or !$value) {
throw new LibRDF_Error("Failed to get current binding {$i}");
}
$retarr[$key] = LibRDF_Node::makeNode(librdf_new_node_from_node($value));
}
return $retarr;
} else {
return NULL;
}
}
