WebmanPatternParser


1   package de.webman.util.log4j;
2   
3   import org.apache.log4j.*;
4   import org.apache.log4j.helpers.FormattingInfo;
5   import org.apache.log4j.helpers.PatternConverter;
6   import org.apache.log4j.helpers.PatternParser;
7   import org.apache.log4j.spi.LoggingEvent;
8   
9   /**
10    Example showing how to extend PatternParser to recognize additional
11    conversion characters.  The examples shows that minimum and maximum
12    width and alignment settings apply for "extension" conversion
13    characters just as they do for PatternLayout recognized characters.
14    
15    <p>In this case MyPatternParser recognizes %# and outputs the value
16    of an internal counter which is also incremented at each call.
17  
18    See <a HREF=doc-files/MyPatternParser.java><b>source</b></a> code
19     for more details.
20    
21    @see org.apache.log4j.examples.MyPatternLayout
22    @see org.apache.log4j.helpers.PatternParser
23    @see org.apache.log4j.PatternLayout
24  
25    * @author Anders Kristensen 
26    * @version $Revision: 1.1 $
27    */
28  public class WebmanPatternParser extends PatternParser
29  {
30  
31    public WebmanPatternParser(String   pattern) {
32      super(pattern);
33    }
34      
35    public void finalizeConverter(char c) {
36      if (c == '#') {
37        addConverter(new UserDirPatternConverter(formattingInfo));
38        currentLiteral.setLength(0);
39      } else {
40        super.finalizeConverter(c);
41      }
42    }
43    
44      private class UserDirPatternConverter extends PatternConverter
45      {
46          UserDirPatternConverter(FormattingInfo formattingInfo) {
47              super(formattingInfo);
48      }
49  
50      public String   convert(LoggingEvent event)
51      {
52          String  [] data = event.getThrowableInformation().getThrowableStrRep() ;
53          StringBuffer   back = new StringBuffer  ();
54          for (int i = 0; i < data.length; i++)
55              back.append(data[i]);
56          return back.toString();
57      }
58    }  
59  }
60
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