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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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package org.apache.log4j.spi;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.LogLog;


// Contibutors: Mathias Bogaert

/**
   RootLogger sits at the top of the logger hierachy. It is a
   regular logger except that it provides several guarantees.

   

First, it cannot be assigned a null level. Second, since root logger cannot have a parent, the {@link #getChainedLevel} method always returns the value of the level field without walking the hierarchy. @author Ceki Gülcü */ public final class RootLogger extends Logger { /** The root logger names itself as "root". However, the root logger cannot be retrieved by name. */ public RootLogger(Level level) { super("root"); setLevel(level); } /** Return the assigned level value without walking the logger hierarchy. */ public final Level getChainedLevel() { return level; } /** Setting a null value to the level of the root logger may have catastrophic results. We prevent this here. @since 0.8.3 */ public final void setLevel(Level level) { if (level == null) { LogLog.error( "You have tried to set a null level to root.", new Throwable()); } else { this.level = level; } } }





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