/**
* Create a new node object from an existing node.
*
* @return void
* @throws LibRDF_Error If unable to copy the node
* @access public
*/
public function __clone()
{
$this->node = librdf_new_node_from_node($this->node);
if (!$this->node) {
throw new LibRDF_Error("Unable to create new Node from Node");
}
}
/**
* 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* Return the current node or NULL if the iterator is no longer valid.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;
}
}
/**
* Find a statement in the model.
*
* A NULL argument for any of source, predicate or target is treated as
* a wildcard. If a context is given, only statements from that context
* will be returned. The result is an object that be used in foreach
* iteration. The returned iterator cannot be rewound.
*
* The search arguments can be either a (source, predicate target) triple
* of LibRDF_Node objects or a LibRDF_Statement object. Valid argument
* lists are (source, predicate, target, [context]) or
* (statement, [context]).
*
* For more complex queries, see {@link LibRDF_Query}.
*
* @param mixed $statement The statement to match or a source node
* @param LibRDF_Node $predicate The predicate to match
* @param LibRDF_Node $target The target to match
* @param LibRDF_URINode $context The context in which to search
* @return LibRDF_StreamIterator An iterator over the matched statements
* @access public
*/
public function findStatements()
{
$num_args = func_num_args();
if ($num_args == 1 or $num_args == 2) {
$statement = func_get_arg(0);
if (!$statement instanceof LibRDF_Statement) {
throw new LibRDF_Error("First argument must be a LibRDF_Statement");
}
if ($num_args == 2) {
$context = func_get_arg(1);
if (!$context instanceof LibRDF_URINode) {
throw new LibRDF_Error("Context must be LibRDF_URINode");
}
} else {
$context = NULL;
}
$statement = $statement->getStatement();
} elseif ($num_args == 3 or $num_args == 4) {
$source = func_get_arg(0);
$predicate = func_get_arg(1);
$target = func_get_arg(2);
if ($source !== NULL) {
if (!$source instanceof LibRDF_Node) {
throw new LibRDF_Error("Argument 1 must be of type LibRDF_Node");
} else {
$source = librdf_new_node_from_node($source->getNode());
}
}
if ($predicate !== NULL) {
if (!$predicate instanceof LibRDF_Node) {
throw new LibRDF_Error("Argument 2 must be of type LibRDF_Node");
} else {
$predicate = librdf_new_node_from_node($predicate->getNode());
}
}
if ($target !== NULL) {
if (!$target instanceof LibRDF_Node) {
throw new LibRDF_Error("Argument 3 must be of type LibRDF_Node");
} else {
$target = librdf_new_node_from_node($target->getNode());
}
}
if ($num_args == 4) {
$context = func_get_arg(3);
if (!$context instanceof LibRDF_URINode) {
throw new LibRDF_Error("Context must be LibRDF_URINode");
}
} else {
$context = NULL;
}
$statement = librdf_new_statement_from_nodes(librdf_php_get_world(), $source, $predicate, $target);
} else {
throw new LibRDF_Error("findStatements takes 2-4 arguments");
}
if ($context !== NULL) {
$stream_resource = librdf_model_find_statements_in_context($this->model, $statement, $context->getNode());
} else {
$stream_resource = librdf_model_find_statements($this->model, $statement);
}
if ($num_args > 2) {
librdf_free_statement($statement);
}
if (!$stream_resource) {
throw new LibRDF_Error("Unable to create new statement iterator");
}
return new LibRDF_StreamIterator($stream_resource, $this);
}
/**
* Return the current tuple of bindings.
*
* The result is an associative array using the binding names as the
* indices.
*
* @return array The current bindings tuple
* @throws LibRDF_Error If unable to get the current bindings tuple
* @access public
*/
public function current()
{
if ($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;
}
}
