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<?php |
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namespace Wikibase\Api\Service; |
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use Deserializers\Deserializer; |
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use Mediawiki\Api\MediawikiApi; |
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use Mediawiki\Api\SimpleRequest; |
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use Mediawiki\DataModel\PageIdentifier; |
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use Mediawiki\DataModel\Revision; |
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use RuntimeException; |
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use Wikibase\DataModel\Entity\EntityId; |
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use Wikibase\DataModel\Entity\Item; |
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use Wikibase\DataModel\Entity\Property; |
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use Wikibase\DataModel\ItemContent; |
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use Wikibase\DataModel\PropertyContent; |
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use Wikibase\DataModel\SiteLink; |
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/** |
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* @access private |
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* |
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* @author Addshore |
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*/ |
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class RevisionGetter { |
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/** |
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* @var MediawikiApi |
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*/ |
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protected $api; |
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/** |
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* @var Deserializer |
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*/ |
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protected $entityDeserializer; |
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/** |
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* @param MediawikiApi $api |
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* @param Deserializer $entityDeserializer |
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*/ |
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public function __construct( MediawikiApi $api, Deserializer $entityDeserializer ) { |
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$this->api = $api; |
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$this->entityDeserializer = $entityDeserializer; |
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} |
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/** |
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* @since 0.1 |
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* @param string|EntityId $id |
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* @return Revision |
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*/ |
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public function getFromId( $id ) { |
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if ( $id instanceof EntityId ) { |
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$id = $id->getSerialization(); |
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} |
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$result = $this->api->getRequest( new SimpleRequest( 'wbgetentities', [ 'ids' => $id ] ) ); |
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return $this->newRevisionFromResult( array_shift( $result['entities'] ) ); |
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} |
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/** |
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* @since 0.1 |
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* @param SiteLink $siteLink |
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* @return Revision |
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*/ |
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public function getFromSiteLink( SiteLink $siteLink ) { |
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$result = $this->api->getRequest( new SimpleRequest( |
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'wbgetentities', |
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[ 'sites' => $siteLink->getSiteId(), 'titles' => $siteLink->getPageName() ] |
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) ); |
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return $this->newRevisionFromResult( array_shift( $result['entities'] ) ); |
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} |
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/** |
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* @since 0.1 |
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* @param string $siteId |
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* @param string $title |
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* @return Revision |
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*/ |
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public function getFromSiteAndTitle( $siteId, $title ) { |
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$result = $this->api->getRequest( new SimpleRequest( |
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'wbgetentities', |
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[ 'sites' => $siteId, 'titles' => $title ] |
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) ); |
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return $this->newRevisionFromResult( array_shift( $result['entities'] ) ); |
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} |
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/** |
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* @param array $entityResult |
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* @return Revision |
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* @todo this could be factored into a different class? |
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*/ |
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private function newRevisionFromResult( array $entityResult ) { |
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if ( array_key_exists( 'missing', $entityResult ) ) { |
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return false; // Throw an exception? |
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} |
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return new Revision( |
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$this->getContentFromEntity( $this->entityDeserializer->deserialize( $entityResult ) ), |
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new PageIdentifier( null, intval( $entityResult['pageid'] ) ), |
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$entityResult['lastrevid'], |
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null, |
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null, |
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$entityResult['modified'] |
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); |
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} |
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/** |
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* @param Item|Property $entity |
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* |
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* @throws RuntimeException |
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* @return ItemContent|PropertyContent |
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* @todo this could be factored into a different class? |
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*/ |
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View Code Duplication |
private function getContentFromEntity( $entity ) { |
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switch ( $entity->getType() ) { |
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case Item::ENTITY_TYPE: |
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return new ItemContent( $entity ); |
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case Property::ENTITY_TYPE: |
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return new PropertyContent( $entity ); |
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default: |
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throw new RuntimeException( 'I cant get a content for this type of entity' ); |
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} |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.