1 /**
2 *
3 * Copyright 2003-2004 The Apache Software Foundation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * 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;
21 import java.io.StringWriter;
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: 355877 $ $Date: 2005-12-10 18:48:27 -0800 (Sat, 10 Dec 2005) $
31 */
32 public final class NamedNDCConverter
33 extends PatternConverter {
34 private final NamedNDC namedNDC;
35
36 public NamedNDCConverter(FormattingInfo formattingInfo, String key) {
37 super(formattingInfo);
38 namedNDC = NamedNDC.getNamedNDC(key);
39 assert namedNDC != null;
40 }
41
42 protected String convert(LoggingEvent loggingEvent) {
43 try {
44 Object value = namedNDC.get();
45 if (value == null) {
46 return null;
47 }
48 return value.toString();
49 } catch (Exception e) {
50 StringWriter sw = new StringWriter();
51 PrintWriter pw = new PrintWriter(sw);
52 e.printStackTrace(pw);
53 return sw.toString();
54 }
55 }
56 }