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Java > Open Source Codes > org > apache > geronimo > system > logging > log4j > NamedNDCConverter


1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */

17
18 package org.apache.geronimo.system.logging.log4j;
19
20 import java.io.PrintWriter JavaDoc;
21 import java.io.StringWriter JavaDoc;
22
23 import org.apache.log4j.helpers.FormattingInfo;
24 import org.apache.log4j.helpers.PatternConverter;
25 import org.apache.log4j.spi.LoggingEvent;
26
27 /**
28  *
29  *
30  * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
31  */

32 public final class NamedNDCConverter
33         extends PatternConverter {
34     private final NamedNDC namedNDC;
35
36     public NamedNDCConverter(FormattingInfo formattingInfo, String JavaDoc key) {
37         super(formattingInfo);
38         namedNDC = NamedNDC.getNamedNDC(key);
39         assert namedNDC != null;
40     }
41
42     protected String JavaDoc convert(LoggingEvent loggingEvent) {
43         try {
44             Object JavaDoc value = namedNDC.get();
45             if (value == null) {
46                 return null;
47             }
48             return value.toString();
49         } catch (Exception JavaDoc e) {
50             StringWriter JavaDoc sw = new StringWriter JavaDoc();
51             PrintWriter JavaDoc pw = new PrintWriter JavaDoc(sw);
52             e.printStackTrace(pw);
53             return sw.toString();
54         }
55     }
56 }
57
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