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  ;
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: 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   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  }
57
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