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<?php
namespace SMW\SQLStore\Lookup;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\Store;
use SMW\Utils\CircularReferenceGuard;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class RedirectTargetLookup {
/**
* @var Store
*/
private $store;
/**
* @var CircularReferenceGuard
*/
private $circularReferenceGuard;
/**
* @since 2.5
*
* @param Store $store
* @param CircularReferenceGuard $circularReferenceGuard
*/
public function __construct( Store $store, CircularReferenceGuard $circularReferenceGuard ) {
$this->store = $store;
$this->circularReferenceGuard = $circularReferenceGuard;
}
/**
* @since 2.5
*
* @param $dataItem
*
* @return DataItem
*/
public function findRedirectTarget( $dataItem ) {
if ( !$dataItem instanceof DIWikiPage && !$dataItem instanceof DIProperty ) {
return $dataItem;
}
$hash = $dataItem->getSerialization();
// Guard against a dataItem that points to itself
$this->circularReferenceGuard->mark( $hash );
if ( !$this->circularReferenceGuard->isCircular( $hash ) ) {
$dataItem = $this->store->getRedirectTarget( $dataItem );
}
$this->circularReferenceGuard->unmark( $hash );
return $dataItem;
}
}
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