+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.AppenderSkeleton;
+import org.apache.log4j.spi.LoggingEvent;
+
+/**
+ * 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>.
+ * @deprecated Use getNullAppender instead. getInstance should have been static.
+ * */
+ public NullAppender getInstance() {
+ return instance;
+ }
+
+ /**
+ * Whenever you can, use this method to retreive an instance instead
+ * of instantiating a new one with <code>new</code>.
+ * */
+ public static NullAppender getNullAppender() {
+ 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;
+ }
+}