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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.util;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.net.SyslogConstants;

public class LevelToSyslogSeverity {

    /*
     * Convert a level to equivalent syslog severity. Only levels for printing methods i.e TRACE, DEBUG, WARN, INFO and
     * ERROR are converted.
     */
    static public int convert(ILoggingEvent event) {

        Level level = event.getLevel();

        switch (level.levelInt) {
        case Level.ERROR_INT:
            return SyslogConstants.ERROR_SEVERITY;
        case Level.WARN_INT:
            return SyslogConstants.WARNING_SEVERITY;
        case Level.INFO_INT:
            return SyslogConstants.INFO_SEVERITY;
        case Level.DEBUG_INT:
        case Level.TRACE_INT:
            return SyslogConstants.DEBUG_SEVERITY;
        default:
            throw new IllegalArgumentException("Level " + level + " is not a valid level for a printing method");
        }
    }
}