wikimedia/mediawiki-extensions-Wikibase

<?php declare( strict_types=1 );

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

use Wikibase\Repo\RestApi\Application\UseCases\GetLatestStatementSubjectRevisionMetadata;
use Wikibase\Repo\RestApi\Application\UseCases\UseCaseError;
use Wikibase\Repo\RestApi\Domain\Services\StatementRetriever;

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

    private StatementRetriever $statementRetriever;
    private GetStatementValidator $validator;
    private GetLatestStatementSubjectRevisionMetadata $getRevisionMetadata;

    public function __construct(
        GetStatementValidator $validator,
        StatementRetriever $statementRetriever,
        GetLatestStatementSubjectRevisionMetadata $getRevisionMetadata
    ) {
        $this->getRevisionMetadata = $getRevisionMetadata;
        $this->statementRetriever = $statementRetriever;
        $this->validator = $validator;
    }

    /**
     * @throws UseCaseError
     */
    public function execute( GetStatementRequest $request ): GetStatementResponse {
        $statementId = $this->validator->validateAndDeserialize( $request )->getStatementId();

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

        $statement = $this->statementRetriever->getStatement( $statementId );
        if ( !$statement ) {
            throw UseCaseError::newResourceNotFound( 'statement' );
        }

        return new GetStatementResponse( $statement, $lastModified, $revisionId );
    }

}