/**
* @param ReferenceValue $reference
* @param string|null $context
* @param Exception|null $previous
*/
public function __construct(ReferenceValue $reference, $context = null, Exception $previous = null)
{
$this->reference = $reference;
$this->context = $context;
if (null === $context) {
$message = sprintf("Unable to resolve reference %s.", var_export($reference->uri()->toString(), true));
} else {
$message = sprintf("Unable to resolve reference %s from within context %s.", var_export($reference->uri()->toString(), true), var_export($context, true));
}
parent::__construct($message, 0, $previous);
}
/**
* @param Value\ReferenceValue $reference
*
* @return Value\PlaceholderValue
* @throws Exception\UndefinedReferenceException
*/
public function visitReferenceValue(Value\ReferenceValue $reference)
{
$referenceUri = $this->uriResolver()->resolve($reference->uri(), $this->currentBaseUri());
$resolution = $this->resolution($referenceUri);
if (null !== $resolution) {
return $resolution;
}
$resolution = $this->startResolution($referenceUri);
if (!($value = $this->resolveInline($referenceUri, $reference))) {
$value = $this->resolveExternal($referenceUri, $reference);
}
$this->completeResolution($referenceUri, $value);
return $resolution;
}