/**
* Converts a JSON-LD element to a RDF Quad object
*
* @param Object $element The element to be converted.
*
* @return IRI|TypedValue|LanguageTagged|null The converted element to be used as Quad object.
*/
private function elementToRdf(Object $element)
{
if (property_exists($element, '@value')) {
return Value::fromJsonLd($element);
}
$iri = new IRI($element->{'@id'});
return $iri->isAbsolute() ? $iri : null;
}
/**
* Normalizes a property value by converting scalars to Value objects.
*
* @param mixed $value The value to normalize.
*
* @return NodeInterface|Value The normalized value.
*/
protected function normalizePropertyValue($value)
{
if (false === is_scalar($value)) {
return $value;
}
return Value::fromJsonLd((object) array('@value' => $value));
}
