    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    }