| /* |
| * 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.spi.LoggingEvent; |
| import org.apache.log4j.AppenderSkeleton; |
| |
| /** |
| * A NullAppender merely exists, it never outputs a message to any |
| * device. |
| * @author Ceki Gülc¨ |
| */ |
| public class NullAppender extends AppenderSkeleton { |
| |
| private static NullAppender instance = new NullAppender(); |
| |
| public NullAppender() { |
| } |
| |
| /** |
| * There are no options to acticate. |
| * */ |
| public void activateOptions() { |
| } |
| |
| /** |
| * Whenever you can, use this method to retreive an instance instead |
| * of instantiating a new one with <code>new</code>. |
| * */ |
| static public NullAppender getInstance() { |
| return instance; |
| } |
| |
| public void close() { |
| } |
| |
| /** |
| * Does not do anything. |
| * */ |
| public void doAppend(LoggingEvent event) { |
| } |
| |
| /** |
| * Does not do anything. |
| * */ |
| protected void append(LoggingEvent event) { |
| } |
| |
| /** |
| * NullAppenders do not need a layout. |
| * */ |
| public boolean requiresLayout() { |
| return false; |
| } |
| } |