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    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 20:35:17 -0800 (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   }

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