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<?php |
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namespace Wikibase\DataModel\Services\Lookup; |
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use InvalidArgumentException; |
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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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* EntityLookup that counts how many entities have been loaded through it and throws |
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* an exception once to many entities have been loaded. |
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* |
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* This is needed to limit the number of entities that can be loaded via some |
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* user controlled features, like entity access in Lua. |
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* |
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* @since 2.0 |
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* |
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* @license GNU GPL v2+ |
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* @author Marius Hoch < [email protected] > |
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*/ |
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class RestrictedEntityLookup implements EntityLookup { |
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/** |
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* @var EntityLookup |
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*/ |
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private $entityLookup; |
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/** |
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* @var int |
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*/ |
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private $entityAccessLimit; |
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/** |
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* @var bool[] Entity id serialization => bool |
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*/ |
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private $entitiesAccessed = array(); |
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/** |
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* @var int |
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*/ |
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private $entityAccessCount = 0; |
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/** |
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* @param EntityLookup $entityLookup |
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* @param int $entityAccessLimit |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function __construct( EntityLookup $entityLookup, $entityAccessLimit ) { |
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if ( !is_int( $entityAccessLimit ) || $entityAccessLimit < 1 ) { |
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throw new InvalidArgumentException( '$entityAccessLimit must be a positive integer' ); |
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} |
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$this->entityLookup = $entityLookup; |
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$this->entityAccessLimit = $entityAccessLimit; |
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} |
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/** |
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* @see EntityLookup::getEntity |
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* |
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* @param EntityId $entityId |
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* |
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* @throws EntityAccessLimitException |
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* @return EntityDocument |
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*/ |
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public function getEntity( EntityId $entityId ) { |
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$entityIdSerialization = $entityId->getSerialization(); |
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if ( !array_key_exists( $entityIdSerialization, $this->entitiesAccessed ) ) { |
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$this->entityAccessCount++; |
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$this->entitiesAccessed[$entityIdSerialization] = true; |
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} |
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if ( $this->entityAccessCount > $this->entityAccessLimit ) { |
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throw new EntityAccessLimitException( |
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$entityId, |
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'To many entities loaded, must not load more than ' . $this->entityAccessLimit . ' entities.' |
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); |
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} |
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return $this->entityLookup->getEntity( $entityId ); |
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} |
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/** |
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* @see EntityLookup::hasEntity |
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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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return $this->entityLookup->hasEntity( $entityId ); |
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} |
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/** |
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* Returns the number of entities already loaded via this object. |
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* |
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* @since 2.0 |
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* |
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* @return int |
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*/ |
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public function getEntityAccessCount() { |
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return $this->entityAccessCount; |
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} |
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/** |
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* Resets the number of entities loaded via this object. |
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* |
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* @since 3.2.1 |
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*/ |
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public function resetEntityAccessCount() { |
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$this->entityAccessCount = 0; |
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} |
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/** |
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* Whether an entity has been accessed before via this RestrictedEntityLookup. |
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* |
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* @since 2.0 |
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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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*/ |
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public function entityHasBeenAccessed( EntityId $entityId ) { |
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$entityIdSerialization = $entityId->getSerialization(); |
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return array_key_exists( $entityIdSerialization, $this->entitiesAccessed ); |
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} |
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} |
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wmde /
WikibaseDataModelServices
