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<?php |
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namespace Wikibase\Lib\Store; |
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use Wikibase\DataModel\Entity\EntityId; |
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use Wikibase\DataModel\Services\Lookup\LabelDescriptionLookupException; |
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use Wikibase\DataModel\Term\TermFallback; |
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use Wikibase\Lib\FormatterCache\TermFallbackCacheFacade; |
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use Wikibase\Lib\TermLanguageFallbackChain; |
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/** |
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* @license GPL-2.0-or-later |
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* |
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* @note The class uses immutable cache approach: cached data never changes once persisted. |
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* For this purpose we not only include Item ID in cache key construction, but also |
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* Item's current revision ID. Revisions never change, the cached data does not need |
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* to change either, which means that we don't need to purge caches. As soon as new revision |
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* is created, cache key will change and old cache data will eventually be purged by |
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* the caching system (eg. APC, Memcached, ...) based on a Least Recently Used strategy |
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* as soon as no code will request it anymore. |
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*/ |
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class CachingFallbackLabelDescriptionLookup implements FallbackLabelDescriptionLookup { |
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use TermCacheKeyBuilder; |
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private const LABEL = 'label'; |
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private const DESCRIPTION = 'description'; |
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/** |
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* @var TermFallbackCacheFacade |
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*/ |
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private $cache; |
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/** |
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* @var RedirectResolvingLatestRevisionLookup |
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*/ |
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private $redirectResolvingRevisionLookup; |
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/** |
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* @var FallbackLabelDescriptionLookup |
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*/ |
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private $labelDescriptionLookup; |
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/** |
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* @var TermLanguageFallbackChain |
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*/ |
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private $termLanguageFallbackChain; |
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/** |
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* @param TermFallbackCacheFacade $fallbackCache |
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* @param RedirectResolvingLatestRevisionLookup $redirectResolvingRevisionLookup |
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* @param FallbackLabelDescriptionLookup $labelDescriptionLookup |
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* @param TermLanguageFallbackChain $termLanguageFallbackChain |
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*/ |
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public function __construct( |
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TermFallbackCacheFacade $fallbackCache, |
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RedirectResolvingLatestRevisionLookup $redirectResolvingRevisionLookup, |
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FallbackLabelDescriptionLookup $labelDescriptionLookup, |
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TermLanguageFallbackChain $termLanguageFallbackChain |
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) { |
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$this->cache = $fallbackCache; |
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$this->redirectResolvingRevisionLookup = $redirectResolvingRevisionLookup; |
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$this->labelDescriptionLookup = $labelDescriptionLookup; |
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$this->termLanguageFallbackChain = $termLanguageFallbackChain; |
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} |
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/** |
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* @param EntityId $entityId |
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* |
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* @throws LabelDescriptionLookupException |
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* @return TermFallback|null |
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*/ |
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public function getDescription( EntityId $entityId ) { |
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$languageCodes = $this->termLanguageFallbackChain->getFetchLanguageCodes(); |
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if ( !$languageCodes ) { |
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// Can happen when the current interface language is not a valid term language, e.g. "de-formal" |
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return null; |
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} |
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$languageCode = $languageCodes[0]; |
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$description = $this->getTerm( $entityId, $languageCode, self::DESCRIPTION ); |
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return $description; |
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} |
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/** |
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* @param EntityId $entityId |
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* |
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* @throws LabelDescriptionLookupException |
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* @return TermFallback|null |
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*/ |
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public function getLabel( EntityId $entityId ) { |
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$languageCodes = $this->termLanguageFallbackChain->getFetchLanguageCodes(); |
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if ( !$languageCodes ) { |
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// Can happen when the current interface language is not a valid term language, e.g. "de-formal" |
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return null; |
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} |
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$languageCode = $languageCodes[0]; |
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$label = $this->getTerm( $entityId, $languageCode, self::LABEL ); |
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return $label; |
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} |
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private function getTerm( EntityId $entityId, $languageCode, $termName = self::LABEL ) { |
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$resolutionResult = $this->redirectResolvingRevisionLookup->lookupLatestRevisionResolvingRedirect( $entityId ); |
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if ( $resolutionResult === null ) { |
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return null; |
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} |
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list( $revisionId, $targetEntityId ) = $resolutionResult; |
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$termFallback = $this->cache->get( $targetEntityId, $revisionId, $languageCode, $termName ); |
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if ( $termFallback === TermFallbackCacheFacade::NO_VALUE ) { |
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$termFallback = $termName === self::LABEL |
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? $this->labelDescriptionLookup->getLabel( $targetEntityId ) |
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: $this->labelDescriptionLookup->getDescription( $targetEntityId ); |
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$this->cache->set( $termFallback, $targetEntityId, $revisionId, $languageCode, $termName ); |
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return $termFallback; |
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} |
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return $termFallback; |
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} |
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} |
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wikimedia /
mediawiki-extensions-Wikibase
Loading history...
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.