class RfcLogLevel

class RfcLogLevel {
    
    /**
     * Log message severity -- Emergency: system is unusable.
     */
    const EMERGENCY = 0;
    
    /**
     * Log message severity -- Alert: action must be taken immediately.
     */
    const ALERT = 1;
    
    /**
     * Log message severity -- Critical conditions.
     */
    const CRITICAL = 2;
    
    /**
     * Log message severity -- Error conditions.
     */
    const ERROR = 3;
    
    /**
     * Log message severity -- Warning conditions.
     */
    const WARNING = 4;
    
    /**
     * Log message severity -- Normal but significant conditions.
     */
    const NOTICE = 5;
    
    /**
     * Log message severity -- Informational messages.
     */
    const INFO = 6;
    
    /**
     * Log message severity -- Debug-level messages.
     */
    const DEBUG = 7;
    
    /**
     * An array with the severity levels as keys and labels as values.
     *
     * @var array
     */
    protected static $levels;
    
    /**
     * Returns a list of severity levels, as defined in RFC 5424.
     *
     * @return array
     *   Array of the possible severity levels for log messages.
     *
     * @see http://tools.ietf.org/html/rfc5424
     * @ingroup logging_severity_levels
     */
    public static function getLevels() {
        if (!static::$levels) {
            static::$levels = [
                static::EMERGENCY => new TranslatableMarkup('Emergency'),
                static::ALERT => new TranslatableMarkup('Alert'),
                static::CRITICAL => new TranslatableMarkup('Critical'),
                static::ERROR => new TranslatableMarkup('Error'),
                static::WARNING => new TranslatableMarkup('Warning'),
                static::NOTICE => new TranslatableMarkup('Notice'),
                static::INFO => new TranslatableMarkup('Info'),
                static::DEBUG => new TranslatableMarkup('Debug'),
            ];
        }
        return static::$levels;
    }

}