/**
* @return string
* @throws \Exception
*/
public function getDatatype()
{
$nodeFactory = new NodeFactory();
$datatypeUri = self::$xsdString;
$datatype = librdf_node_get_literal_value_datatype_uri($this->redlandNode);
if ($datatype !== null) {
$datatypeUri = librdf_uri_to_string($datatype);
} elseif ($this->getLanguage() !== null) {
$datatypeUri = self::$rdfLangString;
}
return $nodeFactory->createNamedNode($datatypeUri);
}
/**
* Convert a node into an associate array
* @ignore
*/
protected static function nodeToArray($node)
{
$object = array();
$object['type'] = EasyRdf_Parser_Redland::nodeTypeString($node);
if ($object['type'] == 'uri') {
$object['value'] = EasyRdf_Parser_Redland::nodeUriString($node);
} else {
if ($object['type'] == 'bnode') {
$object['value'] = '_:' . librdf_node_get_blank_identifier($node);
} else {
if ($object['type'] == 'literal') {
$object['value'] = librdf_node_get_literal_value($node);
$lang = librdf_node_get_literal_value_language($node);
if ($lang) {
$object['lang'] = $lang;
}
$datatype = librdf_node_get_literal_value_datatype_uri($node);
if ($datatype) {
$object['datatype'] = librdf_uri_to_string($datatype);
}
} else {
throw new EasyRdf_Exception("Unsupported type: " . $object['type']);
}
}
}
return $object;
}
/**
* Return the datattype URI or NULL if this literal has no datatype.
*
* @return string The datatype URI
* @access public
*/
public function getDatatype()
{
$uri = librdf_node_get_literal_value_datatype_uri($this->node);
if ($uri !== NULL) {
return librdf_uri_to_string($uri);
} else {
return NULL;
}
}
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 $r;
}
/**
* @return string
*/
public function getUri()
{
return librdf_uri_to_string(librdf_node_get_uri($this->redlandNode));
}
/**
* Return the string representation of the URI.
*
* @return string The URI string
* @access public
*/
public function __toString()
{
return librdf_uri_to_string($this->uri);
}
