wikimedia/mediawiki-extensions-Wikibase

<?php declare( strict_types = 1 );

namespace Wikibase\Repo\RestApi\Application\UseCases\GetItemDescriptionWithFallback;

use Wikibase\Repo\RestApi\Application\UseCases\GetLatestItemRevisionMetadata;
use Wikibase\Repo\RestApi\Application\UseCases\ItemRedirect;
use Wikibase\Repo\RestApi\Application\UseCases\UseCaseError;
use Wikibase\Repo\RestApi\Domain\Services\ItemDescriptionWithFallbackRetriever;

/**
 * @license GPL-2.0-or-later
 */
class GetItemDescriptionWithFallback {

    private GetItemDescriptionWithFallbackValidator $validator;
    private GetLatestItemRevisionMetadata $getRevisionMetadata;
    private ItemDescriptionWithFallbackRetriever $itemDescriptionRetriever;

    public function __construct(
        GetItemDescriptionWithFallbackValidator $validator,
        GetLatestItemRevisionMetadata $getRevisionMetadata,
        ItemDescriptionWithFallbackRetriever $itemDescriptionRetriever
    ) {
        $this->validator = $validator;
        $this->getRevisionMetadata = $getRevisionMetadata;
        $this->itemDescriptionRetriever = $itemDescriptionRetriever;
    }

    /**
     * @throws UseCaseError
     * @throws ItemRedirect
     */
    public function execute( GetItemDescriptionWithFallbackRequest $request ): GetItemDescriptionWithFallbackResponse {
        $deserializedRequest = $this->validator->validateAndDeserialize( $request );
        $itemId = $deserializedRequest->getItemId();
        $languageCode = $deserializedRequest->getLanguageCode();

        [ $revisionId, $lastModified ] = $this->getRevisionMetadata->execute( $itemId );

        $description = $this->itemDescriptionRetriever->getDescription( $itemId, $languageCode );
        if ( $description === null ) {
            throw UseCaseError::newResourceNotFound( 'description' );
        }

        return new GetItemDescriptionWithFallbackResponse( $description, $lastModified, $revisionId, );
    }
}