2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 package org.apache.log4j.varia;
20 import org.apache.log4j.AppenderSkeleton;
21 import org.apache.log4j.spi.LoggingEvent;
24 * A NullAppender merely exists, it never outputs a message to any
26 * @author Ceki Gülc¨
28 public class NullAppender extends AppenderSkeleton {
30 private static NullAppender instance = new NullAppender();
32 public NullAppender() {
36 * There are no options to acticate.
38 public void activateOptions() {
42 * Whenever you can, use this method to retreive an instance instead
43 * of instantiating a new one with <code>new</code>.
44 * @deprecated Use getNullAppender instead. getInstance should have been static.
46 public NullAppender getInstance() {
51 * Whenever you can, use this method to retreive an instance instead
52 * of instantiating a new one with <code>new</code>.
54 public static NullAppender getNullAppender() {
62 * Does not do anything.
64 public void doAppend(LoggingEvent event) {
68 * Does not do anything.
70 protected void append(LoggingEvent event) {
74 * NullAppenders do not need a layout.
76 public boolean requiresLayout() {