private Level toLog4jLevel(int slf4jLevelInt) {
        Level log4jLevel;
        switch (slf4jLevelInt) {
        case LocationAwareLogger.TRACE_INT:
            log4jLevel = Level.TRACE;
            break;
        case LocationAwareLogger.DEBUG_INT:
            log4jLevel = Level.DEBUG;
            break;
        case LocationAwareLogger.INFO_INT:
            log4jLevel = Level.INFO;
            break;
        case LocationAwareLogger.WARN_INT:
            log4jLevel = Level.WARN;
            break;
        case LocationAwareLogger.ERROR_INT:
            log4jLevel = Level.ERROR;
            break;
        default:
            throw new IllegalStateException("Level number " + slf4jLevelInt + " is not recognized.");
        }
        return log4jLevel;
    }
Called by {@link SubstituteLogger} or by {@link LoggingEventBuilder} instances
@param event
slf4j-reload4j/src/main/java/org/slf4j/reload4j/Reload4jLoggerAdapter.java