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<?php |
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namespace Wikibase\DataModel\Services\Lookup; |
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use Wikibase\DataModel\Entity\EntityDocument; |
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use Wikibase\DataModel\Entity\EntityId; |
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/** |
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* Implementation of EntityLookup that opaquely resolves one level |
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* of redirects when looking up entities. |
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* |
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* @since 2.0 |
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* |
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* @license GPL-2.0-or-later |
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* @author Daniel Kinzler |
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*/ |
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class RedirectResolvingEntityLookup implements EntityLookup { |
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/** |
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* An EntityRedirectResolvingDecorator wrapping and emulating a EntityLookup. |
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* |
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* @note This does not formally implement EntityLookup! |
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* |
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* @var EntityLookup |
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*/ |
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private $lookup; |
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/** |
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* @param EntityLookup $lookup The lookup to use |
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*/ |
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public function __construct( EntityLookup $lookup ) { |
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$this->lookup = $lookup; |
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} |
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/** |
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* @see EntityLookup::getEntity |
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* |
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* If the given entity ID points to a redirect, that redirect is resolved and the |
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* target entity returned. |
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* |
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* Callers can detect the presence of a redirect by comparing the ID of the returned |
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* Entity with the request ID. |
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* |
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* @param EntityId $entityId |
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* |
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* @return EntityDocument|null |
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* @throws EntityLookupException |
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*/ |
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public function getEntity( EntityId $entityId ) { |
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try { |
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return $this->lookup->getEntity( $entityId ); |
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} catch ( UnresolvedEntityRedirectException $ex ) { |
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return $this->lookup->getEntity( $ex->getRedirectTargetId() ); |
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} |
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} |
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/** |
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* @see EntityLookup::hasEntity |
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* |
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* If the given entity ID points to a redirect, that redirect is resolved and the |
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* existence of the target entity is checked. |
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* |
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* @param EntityId $entityId |
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* |
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* @return bool |
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* @throws EntityLookupException |
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*/ |
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public function hasEntity( EntityId $entityId ) { |
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try { |
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return $this->lookup->hasEntity( $entityId ); |
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} catch ( UnresolvedEntityRedirectException $ex ) { |
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return $this->lookup->hasEntity( $ex->getRedirectTargetId() ); |
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} |
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} |
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} |
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wmde /
WikibaseDataModelServices
