/*
* Copyright 1999-2005 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.varia;
import org.apache.log4j.Appender;
import org.apache.log4j.Layout;
import org.apache.log4j.spi.OptionHandler;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.Filter;
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>.
* */
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;
}
}