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The Apache Log4j Implementation

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */
package org.apache.logging.log4j.core.net;

import org.apache.logging.log4j.Level;

/**
 *  Severity values used by the Syslog system.
 *
 * 
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 * Numerical Code Severity
0 Emergency: system is unusable
1 Alert: action must be taken immediately
2 Critical: critical conditions
3 Error: error conditions
4 Warning: warning conditions
5 Notice: normal but significant condition
6 Informational: informational messages
7 Debug: debug-level messages
 */
public enum Severity {
    /** System is unusable. */
    EMERG(0),
    /** Action must be taken immediately. */
    ALERT(1),
    /** Critical conditions. */
    CRITICAL(2),
    /** Error conditions. */
    ERROR(3),
    /** Warning conditions. */
    WARNING(4),
    /** Normal but significant conditions. */
    NOTICE(5),
    /** Informational messages. */
    INFO(6),
    /** Debug level messages. */
    DEBUG(7);

    private final int code;

    Severity(final int code) {
        this.code = code;
    }

    /**
     * Returns the severity code.
     * @return The numeric value associated with the Severity.
     */
    public int getCode() {
        return this.code;
    }

    /**
     * Determine if the name matches this Severity.
     * @param name the name to match.
     * @return true if the name matches, false otherwise.
     */
    public boolean isEqual(final String name) {
        return this.name().equalsIgnoreCase(name);
    }

    /**
     * Returns the Severity for the specified Level.
     * @param level The Level.
     * @return The matching Severity, or DEBUG if there is no match.
     */
    public static Severity getSeverity(final Level level) {
        switch (level.getStandardLevel()) {
            case ALL:
                return DEBUG;
            case TRACE:
                return DEBUG;
            case DEBUG:
                return DEBUG;
            case INFO:
                return INFO;
            case WARN:
                return WARNING;
            case ERROR:
                return ERROR;
            case FATAL:
                return ALERT;
            case OFF:
                return EMERG;
        }
        return DEBUG;
    }
}

Numerical Code	Severity
0	Emergency: system is unusable
1	Alert: action must be taken immediately
2	Critical: critical conditions
3	Error: error conditions
4	Warning: warning conditions
5	Notice: normal but significant condition
6	Informational: informational messages
7	Debug: debug-level messages