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Java > Open Source Codes > org > riotfamily > common > log4j > ServletContextAppender


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1
3  * The contents of this file are subject to the Mozilla Public License Version
4  * 1.1 (the "License"); you may not use this file except in compliance with
5  * the License. You may obtain a copy of the License at
6  * http://www.mozilla.org/MPL/
7  *
8  * Software distributed under the License is distributed on an "AS IS" basis,
9  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10  * for the specific language governing rights and limitations under the
11  * License.
12  *
13  * The Original Code is Riot.
14  *
15  * The Initial Developer of the Original Code is
16  * Neteye GmbH.
17  * Portions created by the Initial Developer are Copyright (C) 2006
18  * the Initial Developer. All Rights Reserved.
19  *
20  * Contributor(s):
21  * Felix Gnass [fgnass at neteye dot de]
22  *
23  * ***** END LICENSE BLOCK ***** */
24 package org.riotfamily.common.log4j;
25
26 import javax.servlet.ServletContext JavaDoc;
27
28 import org.apache.log4j.AppenderSkeleton;
29 import org.apache.log4j.spi.LoggingEvent;
30
31 /**
32  * Log4J Appender implementation that logs messages by calling
33  * {@link javax.servlet.ServletContext#log(java.lang.String)
34  * ServletContext.log()}.
35  *
36  * NOTE: Since the appender needs a reference to the ServletContext you must
37  * either add the {@link ServletContextAppenderListener} to your web.xml or
38  * put a {@link ServletContextAppenderConfigurer} into your ApplicationContext.
39  *
40  * @author Felix Gnass [fgnass at neteye dot de]
41  */
42 public class ServletContextAppender extends AppenderSkeleton {
43
44     protected static ServletContext JavaDoc servletContext;
45
46     public static void setContext(ServletContext JavaDoc context) {
47         servletContext = context;
48     }
49
50     protected void append(final LoggingEvent event) {
51         String JavaDoc msg = layout.format(event);
52         if (servletContext == null) {
53             System.out.println(msg);
54         }
55         else {
56             servletContext.log(msg);
57         }
58     }
59
60     public boolean requiresLayout() {
61         return true;
62     }
63
64     public void close() {
65     }
66 }
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