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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.
 */

// Contributors:  Kitching Simon 
//                Nicholas Wolff

package org.apache.log4j;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;

/**
   Defines the minimum set of levels recognized by the system, that is
   OFF, FATAL, ERROR,
   WARN, INFODEBUG and
   ALL.

   

The Level class may be subclassed to define a larger level set. @author Ceki Gülcü */ 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. */ final static public Level OFF = new Level(OFF_INT, "OFF", 0); /** The FATAL level designates very severe error events that will presumably lead the application to abort. */ final static public Level FATAL = new Level(FATAL_INT, "FATAL", 0); /** The ERROR level designates error events that might still allow the application to continue running. */ final static public Level ERROR = new Level(ERROR_INT, "ERROR", 3); /** The WARN level designates potentially harmful situations. */ final static public 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. */ final static public Level INFO = new Level(INFO_INT, "INFO", 6); /** The DEBUG Level designates fine-grained informational events that are most useful to debug an application. */ final static public Level DEBUG = new Level(DEBUG_INT, "DEBUG", 7); /** * The TRACE Level designates finer-grained * informational events than the DEBUGALL has the lowest possible rank and is intended to turn on all logging. */ final static public Level ALL = new Level(ALL_INT, "ALL", 7); /** * Serialization version id. */ static final long serialVersionUID = 3491141966387921974L; /** Instantiate a Level object. */ protected Level(int level, String levelStr, 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}. */ public static Level toLevel(String sArg) { return (Level) toLevel(sArg, Level.DEBUG); } /** Convert an integer passed as argument to a level. If the conversion fails, then this method returns {@link #DEBUG}. */ public static Level toLevel(int val) { return (Level) toLevel(val, Level.DEBUG); } /** Convert an integer passed as argument to a level. If the conversion fails, then this method returns the specified default. */ public static Level toLevel(int val, 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. */ public static Level toLevel(String sArg, Level defaultLevel) { if(sArg == null) return defaultLevel; String s = sArg.toUpperCase(); if(s.equals("ALL")) return Level.ALL; if(s.equals("DEBUG")) return Level.DEBUG; if(s.equals("INFO")) return Level.INFO; if(s.equals("WARN")) return Level.WARN; if(s.equals("ERROR")) return Level.ERROR; if(s.equals("FATAL")) return Level.FATAL; if(s.equals("OFF")) return Level.OFF; if(s.equals("TRACE")) return Level.TRACE; // // For Turkish i problem, see bug 40937 // if(s.equals("\u0130NFO")) return Level.INFO; 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 = ""; } } /** * 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 overriden in classes derived from Level. * @return resolved object. * @throws ObjectStreamException if exception during resolution. */ private Object readResolve() throws ObjectStreamException { // // if the deserizalized object is exactly an instance of Level // if (getClass() == Level.class) { return toLevel(level); } // // extension of Level can't substitute stock item // return this; } }





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