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<?php |
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namespace Wikibase\EntityStore; |
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use BatchingIterator\BatchingFetcher; |
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use Wikibase\DataModel\Entity\Entity; |
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use Wikibase\DataModel\Entity\EntityId; |
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use Wikibase\Lib\Store\EntityLookup; |
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use Wikibase\Lib\Store\StorageException; |
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/** |
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* @since 0.1 |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class BatchingEntityFetcher implements BatchingFetcher { |
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private $entityIdFetcher; |
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private $entityLookup; |
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private $onEntitySkipped; |
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/** |
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* @param BatchingFetcher $entityIdFetcher |
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* @param EntityLookup $entityLookup |
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* @param callable|null $onEntitySkipped with two parameters, EntityId $entityId and string $reasonMessage |
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*/ |
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public function __construct( BatchingFetcher $entityIdFetcher, EntityLookup $entityLookup, $onEntitySkipped = null ) { |
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$this->entityIdFetcher = $entityIdFetcher; |
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$this->entityLookup = $entityLookup; |
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$this->onEntitySkipped = $onEntitySkipped; |
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} |
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/** |
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* @see BatchingFetcher::fetchNext |
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* |
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* @param int $maxFetchCount |
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* |
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* @return Entity[] |
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*/ |
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public function fetchNext( $maxFetchCount ) { |
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do { |
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$entitiesToFetch = $this->entityIdFetcher->fetchNext( $maxFetchCount ); |
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$entities = $this->retrieveEntities( $entitiesToFetch ); |
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} |
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while ( !empty( $entitiesToFetch ) && empty( $entities ) ); |
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return $entities; |
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} |
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private function retrieveEntities( array $entityIds ) { |
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$entities = array(); |
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foreach ( $entityIds as $entityId ) { |
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$entity = $this->retrieveEntity( $entityId ); |
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if ( $entity !== null ) { |
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$entities[] = $entity; |
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} |
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} |
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return $entities; |
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} |
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private function retrieveEntity( EntityId $entityId ) { |
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try { |
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$entity = $this->entityLookup->getEntity( $entityId ); |
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} |
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catch ( StorageException $ex ) { |
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$this->reportSkippedEntity( $entityId, $ex->getMessage() ); |
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return null; |
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} |
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if ( $entity === null ) { |
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$this->reportSkippedEntity( $entityId, 'No such entity in the store' ); |
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} |
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return $entity; |
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} |
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private function reportSkippedEntity( EntityId $entityId, $reasonMessage ) { |
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if ( $this->onEntitySkipped !== null ) { |
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call_user_func( $this->onEntitySkipped, $entityId, $reasonMessage ); |
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} |
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} |
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/** |
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* @see BatchingFetcher::rewind |
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*/ |
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public function rewind() { |
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$this->entityIdFetcher->rewind(); |
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} |
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} |
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wmde /
WikibaseEntityStore
