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diff --git a/unused/srcjar_unused/org/apache/log4j/Appender.java b/unused/srcjar_unused/org/apache/log4j/Appender.java
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+/*
+ * 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;
+
+import org.apache.log4j.spi.Filter;
+import org.apache.log4j.spi.ErrorHandler;
+import org.apache.log4j.spi.LoggingEvent;
+
+/**
+   Implement this interface for your own strategies for outputting log
+   statements.
+
+   @author Ceki Gülcü 
+*/
+public interface Appender {
+
+  /**
+     Add a filter to the end of the filter list.
+
+     @since 0.9.0
+   */
+  void addFilter(Filter newFilter);
+
+  /**
+     Returns the head Filter. The Filters are organized in a linked list
+     and so all Filters on this Appender are available through the result.
+     
+     @return the head Filter or null, if no Filters are present
+     @since 1.1
+  */
+  public
+  Filter getFilter();
+
+  /**
+     Clear the list of filters by removing all the filters in it.
+     
+     @since 0.9.0
+   */
+  public
+  void clearFilters();
+
+  /**
+     Release any resources allocated within the appender such as file
+     handles, network connections, etc.
+
+     <p>It is a programming error to append to a closed appender.
+
+     @since 0.8.4
+  */
+  public
+  void close();
+  
+  /**
+     Log in <code>Appender</code> specific way. When appropriate,
+     Loggers will call the <code>doAppend</code> method of appender
+     implementations in order to log. */
+  public
+  void doAppend(LoggingEvent event);
+
+
+  /**
+     Get the name of this appender.
+     @return name, may be null.*/
+  public
+  String getName();
+
+
+  /**
+     Set the {@link ErrorHandler} for this appender.
+
+     @since 0.9.0
+   */
+  public
+  void setErrorHandler(ErrorHandler errorHandler);
+
+  /**
+     Returns the {@link ErrorHandler} for this appender.
+
+     @since 1.1
+   */
+  public
+  ErrorHandler getErrorHandler();
+
+  /**
+     Set the {@link Layout} for this appender.
+
+     @since 0.8.1
+  */
+  public
+  void setLayout(Layout layout);
+
+  /**
+     Returns this appenders layout.
+     
+     @since 1.1
+  */
+  public
+  Layout getLayout();
+  
+
+  /**
+     Set the name of this appender. The name is used by other
+     components to identify this appender.
+
+     @since 0.8.1
+  */
+  public
+  void setName(String name);
+
+  /**
+     Configurators call this method to determine if the appender
+    requires a layout. If this method returns <code>true</code>,
+    meaning that layout is required, then the configurator will
+    configure an layout using the configuration information at its
+    disposal.  If this method returns <code>false</code>, meaning that
+    a layout is not required, then layout configuration will be
+    skipped even if there is available layout configuration
+    information at the disposal of the configurator..
+
+     <p>In the rather exceptional case, where the appender
+     implementation admits a layout but can also work without it, then
+     the appender should return <code>true</code>.
+     
+     @since 0.8.4 */
+  public
+  boolean requiresLayout();
+}