protected function getNodeForRedlandNode($redlandNode)
{
if (librdf_node_is_literal($redlandNode)) {
return new Literal($redlandNode);
} elseif (librdf_node_is_resource($redlandNode)) {
return new NamedNode($redlandNode);
} elseif (librdf_node_is_blank($redlandNode)) {
return new BlankNode($redlandNode);
}
}
/**
* Create a new Literal node.
*
* Both the $language and $datatype parameters are optional.
*
* The value of the literal node can either be a string or an XML literal
* in the form of a DOMNodeList object. If using XML, a datatype of
* http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral is implied, so
* the datatype parameter cannot be used with XML. A literal cannot have
* both a language and a datatype.
*
* @param mixed $value The literal value, either a string, a DOMNodeList or a librdf_node resource
* @param string $datatype An optional datatype URI for the literal value
* @param string $language An option language for the literal value
* @return void
* @throws LibRDF_Error If unabel to create a new node
* @access public
*/
public function __construct()
{
$valuestr = "";
$is_xml = 0;
// possible parameter lists are either LibRDF_Node $resource or
// string $value, $datatype=NULL, string $language=NULL
$num_args = func_num_args();
if ($num_args < 1 or $num_args > 3) {
throw new LibRDF_Error("Invalid number of arguments");
}
$value = func_get_arg(0);
if ($num_args >= 2) {
$datatype = func_get_arg(1);
if ($datatype) {
$datatype = new LibRDF_URI($datatype);
}
} else {
$datatype = NULL;
}
if ($num_args >= 3) {
$language = func_get_arg(2);
} else {
$language = NULL;
}
if ($num_args == 1 and is_resource($value)) {
if (!librdf_node_is_literal($value)) {
throw new LibRDF_Error("Argument 1 not a valid librdf_node " . " literal node");
} else {
$this->node = $value;
}
} else {
// value is XML, convert to a string and set the datatype
if ($value instanceof DOMNodeList) {
// XML values imply a datatype of
// http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral, so
// specifying a different datatype is an error
if ($datatype !== NULL and $datatype->__toString() !== "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral") {
throw new LibRDF_Error("Cannot override datatype for XML literal");
} else {
$datatype = NULL;
}
$valuestr = "";
foreach ($value as $item) {
$valuestr .= $item->ownerDocument->saveXML($item);
}
$is_xml = 1;
} else {
$valuestr = (string) $value;
$is_xml = 0;
}
if ($datatype !== NULL) {
$datatype_uri = $datatype->getURI();
} else {
$datatype_uri = NULL;
}
if ($is_xml or $datatype === NULL and $language === NULL) {
$this->node = librdf_new_node_from_literal(librdf_php_get_world(), $valuestr, $language, $is_xml);
} else {
$this->node = librdf_new_node_from_typed_literal(librdf_php_get_world(), $valuestr, $language, $datatype_uri);
}
}
if (!$this->node) {
throw new LibRDF_Error("Unable to create new literal node");
}
}
function _node($node)
{
$r = array();
if (librdf_node_is_resource($node)) {
$r['type'] = 'uri';
$r['value'] = librdf_uri_to_string(librdf_node_get_uri($node));
} elseif (librdf_node_is_literal($node)) {
$r['type'] = 'literal';
$r['value'] = librdf_node_get_literal_value($node);
$dt = librdf_node_get_literal_value_datatype_uri($node);
if ($dt) {
$r['datatype'] = librdf_uri_to_string($dt);
}
} elseif (librdf_node_is_blank($node)) {
$r['type'] = 'bnode';
$r['value'] = librdf_node_get_blank_identifier($node);
}
return $r;
}
