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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.spi;

import  org.apache.log4j.*;
import  org.apache.log4j.helpers.LogLog;

// Contibutors: Mathias Bogaert

   RootCategory sits at the top of the category hierachy. It is a
   regular category except that it provides several guarantees.


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

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