/**
* 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, $this);
}
function remove_triple($triple)
{
if (!isset($triple['type']) || $triple['type'] != 'triple') {
return 0;
}
$r = 0;
$s = $triple['s'];
$p = $triple['p'];
$o = $triple['o'];
if (!is_null($s)) {
$s = $this->_uriNode($s);
}
if (!is_null($p)) {
$p = $this->_uriNode($p);
}
if (!is_null($o)) {
if ($triple['o_type'] == 'uri') {
$o = $this->_uriNode($o);
} elseif ($triple['o_type'] == 'literal') {
$o = $this->_literalNode($o);
}
}
$pattern = librdf_new_statement_from_nodes($this->_world, $s, $p, $o);
$stream = librdf_model_find_statements($this->_model, $pattern);
while (!librdf_stream_end($stream)) {
$elt = librdf_stream_get_object($stream);
$r += librdf_model_remove_statement($this->_model, $elt) ? 0 : 1;
librdf_stream_next($stream);
}
librdf_free_stream($stream);
//librdf_free_statement($pattern);
//$s && librdf_free_node($s);
//$p && librdf_free_node($p);
return $r;
}