/* * 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.spi;import org.apache.log4j.Appender;import java.util.Enumeration;/**   Interface for attaching appenders to objects.   @author Ceki G&uuml;lc&uuml;   @since 0.9.1 */public interface AppenderAttachable {    /**     Add an appender.   */  public  void addAppender(Appender newAppender);  /**     Get all previously added appenders as an Enumeration.  */  public  Enumeration getAllAppenders();  /**     Get an appender by name.   */  public  Appender getAppender(String name);    /**     Returns <code>true</code> if the specified appender is in list of     attached attached, <code>false</code> otherwise.     @since 1.2 */  public   boolean isAttached(Appender appender);  /**     Remove all previously added appenders.  */  void removeAllAppenders();  /**     Remove the appender passed as parameter from the list of appenders.  */   void removeAppender(Appender appender); /**    Remove the appender with the name passed as parameter from the    list of appenders.    */ void removeAppender(String name);   }