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The Apache Log4j 1.x Compatibility API
/*
* 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.log4j;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.Locale;
import org.apache.logging.log4j.util.Strings;
/**
* Defines the minimum set of levels recognized by the system, that is
* OFF, FATAL, ERROR,
* WARN, INFO, DEBUG
* and ALL.
*
* The Level class may be subclassed to define a larger
* level set.
*
*/
public class Level extends Priority implements Serializable {
/**
* TRACE level integer value.
*
* @since 1.2.12
*/
public static final int TRACE_INT = 5000;
/**
* The OFF has the highest possible rank and is
* intended to turn off logging.
*/
public static final Level OFF = new Level(OFF_INT, "OFF", 0);
/**
* The FATAL level designates very severe error
* events that will presumably lead the application to abort.
*/
public static final Level FATAL = new Level(FATAL_INT, "FATAL", 0);
/**
* The ERROR level designates error events that
* might still allow the application to continue running.
*/
public static final Level ERROR = new Level(ERROR_INT, "ERROR", 3);
/**
* The WARN level designates potentially harmful situations.
*/
public static final Level WARN = new Level(WARN_INT, "WARN", 4);
/**
* The INFO level designates informational messages
* that highlight the progress of the application at coarse-grained
* level.
*/
public static final Level INFO = new Level(INFO_INT, "INFO", 6);
/**
* The DEBUG Level designates fine-grained
* informational events that are most useful to debug an
* application.
*/
public static final Level DEBUG = new Level(DEBUG_INT, "DEBUG", 7);
/**
* The TRACE Level designates finer-grained
* informational events than the DEBUG level.
*/
public static final Level TRACE = new Level(TRACE_INT, "TRACE", 7);
/**
* The ALL has the lowest possible rank and is intended to
* turn on all logging.
*/
public static final Level ALL = new Level(ALL_INT, "ALL", 7);
/**
* Serialization version id.
*/
private static final long serialVersionUID = 3491141966387921974L;
/**
* Instantiate a Level object.
*
* @param level The logging level.
* @param levelStr The level name.
* @param syslogEquivalent The matching syslog level.
*/
protected Level(final int level, final String levelStr, final int syslogEquivalent) {
super(level, levelStr, syslogEquivalent);
}
/**
* Convert the string passed as argument to a level. If the
* conversion fails, then this method returns {@link #DEBUG}.
*
* @param sArg The level name.
* @return The Level.
*/
public static Level toLevel(final String sArg) {
return toLevel(sArg, Level.DEBUG);
}
/**
* Convert an integer passed as argument to a level. If the
* conversion fails, then this method returns {@link #DEBUG}.
*
* @param val The integer value of the Level.
* @return The Level.
*/
public static Level toLevel(final int val) {
return toLevel(val, Level.DEBUG);
}
/**
* Convert an integer passed as argument to a level. If the
* conversion fails, then this method returns the specified default.
*
* @param val The integer value of the Level.
* @param defaultLevel the default level if the integer doesn't match.
* @return The matching Level.
*/
public static Level toLevel(final int val, final Level defaultLevel) {
switch (val) {
case ALL_INT:
return ALL;
case DEBUG_INT:
return Level.DEBUG;
case INFO_INT:
return Level.INFO;
case WARN_INT:
return Level.WARN;
case ERROR_INT:
return Level.ERROR;
case FATAL_INT:
return Level.FATAL;
case OFF_INT:
return OFF;
case TRACE_INT:
return Level.TRACE;
default:
return defaultLevel;
}
}
/**
* Convert the string passed as argument to a level. If the
* conversion fails, then this method returns the value of
* defaultLevel.
* @param sArg The name of the Level.
* @param defaultLevel The default Level to use.
* @return the matching Level.
*/
public static Level toLevel(final String sArg, final Level defaultLevel) {
if (sArg == null) {
return defaultLevel;
}
final String s = sArg.toUpperCase(Locale.ROOT);
switch (s) {
case "ALL":
return Level.ALL;
case "DEBUG":
return Level.DEBUG;
case "INFO":
return Level.INFO;
case "WARN":
return Level.WARN;
case "ERROR":
return Level.ERROR;
case "FATAL":
return Level.FATAL;
case "OFF":
return Level.OFF;
case "TRACE":
return Level.TRACE;
default:
return defaultLevel;
}
}
/**
* Custom deserialization of Level.
*
* @param s serialization stream.
* @throws IOException if IO exception.
* @throws ClassNotFoundException if class not found.
*/
private void readObject(final ObjectInputStream s) throws IOException, ClassNotFoundException {
s.defaultReadObject();
level = s.readInt();
syslogEquivalent = s.readInt();
levelStr = s.readUTF();
if (levelStr == null) {
levelStr = Strings.EMPTY;
}
}
/**
* Serialize level.
*
* @param s serialization stream.
* @throws IOException if exception during serialization.
*/
private void writeObject(final ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
s.writeInt(level);
s.writeInt(syslogEquivalent);
s.writeUTF(levelStr);
}
/**
* Resolved deserialized level to one of the stock instances.
* May be overridden in classes derived from Level.
*
* @return resolved object.
* @throws ObjectStreamException if exception during resolution.
*/
protected Object readResolve() throws ObjectStreamException {
//
// if the deserialized object is exactly an instance of Level
//
if (getClass() == Level.class) {
return toLevel(level);
}
//
// extension of Level can't substitute stock item
//
return this;
}
}