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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.OptionConverter;

   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 set to 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 */ public class LevelMatchFilter extends Filter { /** Do we return ACCEPT when a match occurs. Default is true. */ boolean acceptOnMatch = true; /** */ Level levelToMatch; public void setLevelToMatch(String level) { levelToMatch = OptionConverter.toLevel(level, null); } public String getLevelToMatch() { return levelToMatch == null ? null : levelToMatch.toString(); } public void setAcceptOnMatch(boolean acceptOnMatch) { this.acceptOnMatch = acceptOnMatch; } public boolean getAcceptOnMatch() { return acceptOnMatch; } /** Return the decision of this filter. Returns {@link Filter#NEUTRAL} if the LevelToMatch option is not set or if there is not match. Otherwise, if there is a match, then the returned decision is {@link Filter#ACCEPT} if the AcceptOnMatch property is set to true. The returned decision is {@link Filter#DENY} if the AcceptOnMatch property is set to false. */ public int decide(LoggingEvent event) { if(this.levelToMatch == null) { return Filter.NEUTRAL; } boolean matchOccured = false; if(this.levelToMatch.equals(event.getLevel())) { matchOccured = true; } if(matchOccured) { if(this.acceptOnMatch) return Filter.ACCEPT; else return Filter.DENY; } else { return Filter.NEUTRAL; } } }

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