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Java > Open Source Codes > org > jboss > logging > layout > ThreadMDCConverter


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */

22 package org.jboss.logging.layout;
23
24 import org.apache.log4j.MDC;
25 import org.apache.log4j.helpers.FormattingInfo;
26 import org.apache.log4j.helpers.PatternConverter;
27 import org.apache.log4j.spi.LoggingEvent;
28
29 /** A PatternConverter that uses the current thread MDC rather than the
30  * LoggingEvent MDC value.
31  *
32  * @author Scott.Stark@jboss.org
33  * @version $Revision: 1958 $
34  */

35 public class ThreadMDCConverter extends PatternConverter
36 {
37    private String JavaDoc key;
38    /** Creates a new instance of ThreadMDCPatternConverter */
39    public ThreadMDCConverter(FormattingInfo formattingInfo, String JavaDoc key)
40    {
41       super(formattingInfo);
42       this.key = key;
43    }
44
45    protected String JavaDoc convert(LoggingEvent loggingEvent)
46    {
47       Object JavaDoc val = MDC.get(key);
48       String JavaDoc strVal = null;
49       if( val != null )
50          strVal = val.toString();
51       return strVal;
52    }
53
54 }
55
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