Examples of org.apache.log4j.varia.LevelMatchFilter

org.apache.log4j.varia.LevelMatchFilter
This is a very simple filter based on level matching.
The filter admits two options LevelToMatch and AcceptOnMatch. If there is an exact match between the value of the LevelToMatch option and the level of the {@link LoggingEvent}, then the {@link #decide} method returns {@link Filter#ACCEPT} in case the AcceptOnMatch option value is setto true, if it is false then {@link Filter#DENY} is returned. If there is no match, {@link Filter#NEUTRAL} is returned. @author Ceki Gülcü @since 1.2

    // set up appender
    Layout layout = new SimpleLayout();
    Appender appender = new FileAppender(layout, ACCEPT_FILE, false);
    
    // create LevelMatchFilter
    LevelMatchFilter matchFilter = new LevelMatchFilter();
 
     // attach match filter to appender
    appender.addFilter(matchFilter);
   
    // attach DenyAllFilter to end of filter chain to deny neutral
    // (non matching) messages
    appender.addFilter(new DenyAllFilter());
        
    // set appender on root and set level to debug
    root.addAppender(appender);
    root.setLevel(Level.TRACE);
    
    Level[] levelArray = new Level[] {Level.TRACE, Level.DEBUG, Level.INFO, Level.WARN, 
              Level.ERROR, Level.FATAL};
    for (int x = 0; x < levelArray.length; x++) {
      // set the level to match
      matchFilter.setLevelToMatch(levelArray[x].toString());
      common("pass " + x + "; filter set to accept only " 
       + levelArray[x].toString() + " msgs");
    }
    
    Transformer.transform(ACCEPT_FILE, ACCEPT_FILTERED, new LineNumberFilter());

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    // set up appender
    Layout layout = new SimpleLayout();
    Appender appender = new FileAppender(layout, DENY_FILE, false);
    
    // create LevelMatchFilter, set to deny matches
    LevelMatchFilter matchFilter = new LevelMatchFilter();
    matchFilter.setAcceptOnMatch(false);
 
     // attach match filter to appender
    appender.addFilter(matchFilter);
           
    // set appender on root and set level to debug
    root.addAppender(appender);
    root.setLevel(Level.TRACE);
    
    Level[] levelArray = new Level[] {Level.TRACE, Level.DEBUG, Level.INFO, Level.WARN,
              Level.ERROR, Level.FATAL};
    for (int x = 0; x < levelArray.length; x++) {
      // set the level to match
      matchFilter.setLevelToMatch(levelArray[x].toString());
      common("pass " + x + "; filter set to deny only " + levelArray[x].toString()
              + " msgs");
    }
    
    Transformer.transform(DENY_FILE, DENY_FILTERED, new LineNumberFilter());

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//            ConsoleAppender consoleAppender = new ConsoleAppender(
//                    new SimpleLayout());


            // print all but debug messages:
            LevelMatchFilter debugLevelMatchFilter = new LevelMatchFilter();
            debugLevelMatchFilter.setLevelToMatch("debug");
            debugLevelMatchFilter.setAcceptOnMatch(false);
            infoFileAppender.addFilter(debugLevelMatchFilter);


//            consoleAppender.addFilter(debugLevelMatchFilter);


//            logger.addAppender(consoleAppender);

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