SearchEngineFactory.php

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<?php

use Wikimedia\Rdbms\IDatabase;

class SearchEngineFactory {
    private $config;

    public function __construct( SearchEngineConfig $config ) {
        $this->config = $config;
    }

    public function create( $type = null ) {
        $dbr = null;

        $configType = $this->config->getSearchType();
        $alternatives = $this->config->getSearchTypes();

        if ( $type && in_array( $type, $alternatives ) ) {
            $class = $type;
        } elseif ( $configType !== null ) {
            $class = $configType;
        } else {
            $dbr = wfGetDB( DB_REPLICA );
            $class = self::getSearchEngineClass( $dbr );
        }

        $search = new $class( $dbr );
        return $search;
    }

    public static function getSearchEngineClass( IDatabase $db ) {
        switch ( $db->getType() ) {
            case 'sqlite':
                return SearchSqlite::class;
            case 'mysql':
                return SearchMySQL::class;
            case 'postgres':
                return SearchPostgres::class;
            case 'mssql':
                return SearchMssql::class;
            case 'oracle':
                return SearchOracle::class;
            default:
                return SearchEngineDummy::class;
        }
    }
}