001 /* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jcommon/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * --------------
028 * LogTarget.java
029 * --------------
030 * (C)opyright 2002-2004, by Object Refinery Limited.
031 *
032 * $Id: LogTarget.java,v 1.3 2005/11/14 10:55:59 mungady Exp $
033 *
034 * Changes
035 * -------
036 * 11-May-2002 : Initial version
037 * 06-Dec-2002 : LogTargets now use Object-Parameters instead of Strings.
038 * 05-Feb-2003 : Removed unnecessary methods.
039 * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
040 *
041 */
042
043 package org.jfree.util;
044
045 /**
046 * An interface that defines a log target (a consumer of log messages). Classes which
047 * implement this interface can be registered with the {@link org.jfree.util.Log} class
048 * and will then receive logging messages generated by the code.
049 *
050 * @author Thomas Morgner
051 */
052 public interface LogTarget {
053
054 /**
055 * Loglevel ERROR.
056 */
057 public static final int ERROR = 0;
058
059 /**
060 * Loglevel WARN.
061 */
062 public static final int WARN = 1;
063
064 /**
065 * Loglevel INFO.
066 */
067 public static final int INFO = 2;
068
069 /**
070 * Loglevel DEBUG.
071 */
072 public static final int DEBUG = 3;
073
074 /** Strings for the log levels. */
075 public static final String[] LEVELS =
076 {
077 "ERROR: ",
078 "WARN: ",
079 "INFO: ",
080 "DEBUG: "
081 };
082
083 /**
084 * Logs a message at a specified log level.
085 *
086 * @param level the log level.
087 * @param message the log message.
088 */
089 public void log(int level, Object message);
090
091 /**
092 * Logs a message at a specified log level.
093 *
094 * @param level the log level.
095 * @param message the log message.
096 * @param e the exception
097 */
098 public void log(int level, Object message, Exception e);
099 }