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diff --git a/srcjar_unused/org/apache/log4j/spi/TriggeringEventEvaluator.java b/srcjar_unused/org/apache/log4j/spi/TriggeringEventEvaluator.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.spi;
+
+/**
+   
+   Implementions of this interface allow certain appenders to decide
+   when to perform an appender specific action.
+
+  <p>For example the {@link org.apache.log4j.net.SMTPAppender} sends
+  an email when the {@link #isTriggeringEvent} method returns
+  <code>true</code> and adds the event to an internal buffer when the
+  returned result is <code>false</code>.
+
+  @author Ceki G&uuml;lc&uuml;
+  @since version 1.0
+   
+ */
+public interface TriggeringEventEvaluator {
+  
+  /**
+     Is this the triggering event?
+   */
+  public boolean isTriggeringEvent(LoggingEvent event);
+}