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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 * Copyright (C) The Apache Software Foundation. All rights reserved.
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */

package org.apache.log4j.varia;

import org.apache.log4j.Level;
import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.helpers.OptionConverter;

   This is a very simple filter based on level matching, which can be
   used to reject messages with priorities outside a certain range.

The filter admits three options LevelMin, LevelMax and AcceptOnMatch.

If the level of the {@link LoggingEvent} is not between Min and Max (inclusive), then {@link Filter#DENY} is returned.

If the Logging event level is within the specified range, then if AcceptOnMatch is true, {@link Filter#ACCEPT} is returned, and if AcceptOnMatch is false, {@link Filter#NEUTRAL} is returned.

If LevelMinw is not defined, then there is no minimum acceptable level (ie a level is never rejected for being too "low"/unimportant). If LevelMax is not defined, then there is no maximum acceptable level (ie a level is never rejected for beeing too "high"/important).

Refer to the {@link org.apache.log4j.AppenderSkeleton#setThreshold setThreshold} method available to all appenders extending {@link org.apache.log4j.AppenderSkeleton} for a more convenient way to filter out events by level. @author Simon Kitching @author based on code by Ceki Gülcü */ public class LevelRangeFilter extends Filter { /** Do we return ACCEPT when a match occurs. Default is false, so that later filters get run by default */ boolean acceptOnMatch = false; Level levelMin; Level levelMax; /** Return the decision of this filter. */ public int decide(LoggingEvent event) { if(this.levelMin != null) { if (event.getLevel().isGreaterOrEqual(levelMin) == false) { // level of event is less than minimum return Filter.DENY; } } if(this.levelMax != null) { if (event.getLevel().toInt() > levelMax.toInt()) { // level of event is greater than maximum // Alas, there is no Level.isGreater method. and using // a combo of isGreaterOrEqual && !Equal seems worse than // checking the int values of the level objects.. return Filter.DENY; } } if (acceptOnMatch) { // this filter set up to bypass later filters and always return // accept if level in range return Filter.ACCEPT; } else { // event is ok for this filter; allow later filters to have a look.. return Filter.NEUTRAL; } } /** Get the value of the LevelMax option. */ public Level getLevelMax() { return levelMax; } /** Get the value of the LevelMin option. */ public Level getLevelMin() { return levelMin; } /** Get the value of the AcceptOnMatch option. */ public boolean getAcceptOnMatch() { return acceptOnMatch; } /** Set the LevelMax option. */ public void setLevelMax(Level levelMax) { this.levelMax = levelMax; } /** Set the LevelMin option. */ public void setLevelMin(Level levelMin) { this.levelMin = levelMin; } /** Set the AcceptOnMatch option. */ public void setAcceptOnMatch(boolean acceptOnMatch) { this.acceptOnMatch = acceptOnMatch; } }

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