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Java > Open Source Codes > org > jfree > util > LogTarget


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * --------------
28  * LogTarget.java
29  * --------------
30  * (C)opyright 2002-2004, by Object Refinery Limited.
31  *
32  * $Id: LogTarget.java,v 1.3 2005/11/14 10:55:59 mungady Exp $
33  *
34  * Changes
35  * -------
36  * 11-May-2002 : Initial version
37  * 06-Dec-2002 : LogTargets now use Object-Parameters instead of Strings.
38  * 05-Feb-2003 : Removed unnecessary methods.
39  * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
40  *
41  */
42
43 package org.jfree.util;
44
45 /**
46  * An interface that defines a log target (a consumer of log messages). Classes which
47  * implement this interface can be registered with the {@link org.jfree.util.Log} class
48  * and will then receive logging messages generated by the code.
49  *
50  * @author Thomas Morgner
51  */
52 public interface LogTarget {
53
54     /**
55      * Loglevel ERROR.
56      */
57     public static final int ERROR = 0;
58
59     /**
60      * Loglevel WARN.
61      */
62     public static final int WARN = 1;
63
64     /**
65      * Loglevel INFO.
66      */
67     public static final int INFO = 2;
68
69     /**
70      * Loglevel DEBUG.
71      */
72     public static final int DEBUG = 3;
73
74     /** Strings for the log levels. */
75     public static final String JavaDoc[] LEVELS =
76         {
77             "ERROR: ",
78             "WARN: ",
79             "INFO: ",
80             "DEBUG: "
81         };
82
83     /**
84      * Logs a message at a specified log level.
85      *
86      * @param level the log level.
87      * @param message the log message.
88      */
89     public void log(int level, Object JavaDoc message);
90
91     /**
92      * Logs a message at a specified log level.
93      *
94      * @param level the log level.
95      * @param message the log message.
96      * @param e the exception
97      */
98     public void log(int level, Object JavaDoc message, Exception JavaDoc e);
99 }
100
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