/* * 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.performance;import org.apache.log4j.Layout;import org.apache.log4j.spi.LoggingEvent;import org.apache.log4j.AppenderSkeleton;/** * A bogus appender which calls the format method of its layout object * but does not write the result anywhere. * * <p><b> <font color="#FF2222">The * <code>org.apache.log4j.performance.NullAppender</code> class is * intended for internal use only.</font> Consequently, it is not * included in the <em>log4j.jar</em> file.</b> </p> * */public class NullAppender extends AppenderSkeleton {  public static String s;  public String t;  public  NullAppender() {}  public  NullAppender(Layout layout) {    this.layout = layout;  }  public  void close() {}  public  void doAppend(LoggingEvent event) {    if(layout != null) {      t = layout.format(event);      s = t;    }  }  public  void append(LoggingEvent event) {  }  /**     This is a bogus appender but it still uses a layout.  */  public  boolean requiresLayout() {    return true;  }}