| /* |
| * Copyright 1999,2004 The Apache Software Foundation. |
| * |
| * Licensed 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 |
| * limitations under the License. |
| */ |
| |
| package org.apache.log4j.spi; |
| |
| import org.apache.log4j.*; |
| 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. |
| |
| <p>First, it cannot be assigned a <code>null</code> |
| 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; |
| } |
| } |
| |
| } |