wikimedia/mediawiki-extensions-Wikibase

<?php declare( strict_types = 1 );

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

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\ItemLabelRetriever;

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

    private GetLatestItemRevisionMetadata $getLatestRevisionMetadata;
    private ItemLabelRetriever $itemLabelRetriever;
    private GetItemLabelValidator $validator;

    public function __construct(
        GetLatestItemRevisionMetadata $getLatestRevisionMetadata,
        ItemLabelRetriever $itemLabelRetriever,
        GetItemLabelValidator $validator
    ) {
        $this->getLatestRevisionMetadata = $getLatestRevisionMetadata;
        $this->itemLabelRetriever = $itemLabelRetriever;
        $this->validator = $validator;
    }

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

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

        $label = $this->itemLabelRetriever->getLabel( $itemId, $languageCode );
        if ( !$label ) {
            throw UseCaseError::newResourceNotFound( 'label' );
        }

        return new GetItemLabelResponse(
            $label,
            $lastModified,
            $revisionId,
        );
    }
}