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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/EofSensorWatcher.java $
+ * $Revision: 552264 $
+ * $Date: 2007-07-01 02:37:47 -0700 (Sun, 01 Jul 2007) $
+ *
+ * ====================================================================
+ *
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.conn;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+
+/**
+ * A watcher for {@link EofSensorInputStream EofSensorInputStream}.
+ * Each stream will notify it's watcher at most once.
+ *
+ * @author <a href="mailto:rolandw at apache.org">Roland Weber</a>
+ *
+ *
+ * <!-- empty lines to avoid svn diff problems -->
+ * @version $Revision: 552264 $
+ *
+ * @since 4.0
+ */
+public interface EofSensorWatcher {
+
+ /**
+ * Indicates that EOF is detected.
+ *
+ * @param wrapped the underlying stream which has reached EOF
+ *
+ * @return <code>true</code> if <code>wrapped</code> should be closed,
+ * <code>false</code> if it should be left alone
+ *
+ * @throws IOException
+ * in case of an IO problem, for example if the watcher itself
+ * closes the underlying stream. The caller will leave the
+ * wrapped stream alone, as if <code>false</code> was returned.
+ */
+ boolean eofDetected(InputStream wrapped)
+ throws IOException
+ ;
+
+
+ /**
+ * Indicates that the {@link EofSensorInputStream stream} is closed.
+ * This method will be called only if EOF was <i>not</i> detected
+ * before closing. Otherwise, {@link #eofDetected eofDetected} is called.
+ *
+ * @param wrapped the underlying stream which has not reached EOF
+ *
+ * @return <code>true</code> if <code>wrapped</code> should be closed,
+ * <code>false</code> if it should be left alone
+ *
+ * @throws IOException
+ * in case of an IO problem, for example if the watcher itself
+ * closes the underlying stream. The caller will leave the
+ * wrapped stream alone, as if <code>false</code> was returned.
+ */
+ boolean streamClosed(InputStream wrapped)
+ throws IOException
+ ;
+
+
+ /**
+ * Indicates that the {@link EofSensorInputStream stream} is aborted.
+ * This method will be called only if EOF was <i>not</i> detected
+ * before aborting. Otherwise, {@link #eofDetected eofDetected} is called.
+ * <p/>
+ * This method will also be invoked when an input operation causes an
+ * IOException to be thrown to make sure the input stream gets shut down.
+ *
+ * @param wrapped the underlying stream which has not reached EOF
+ *
+ * @return <code>true</code> if <code>wrapped</code> should be closed,
+ * <code>false</code> if it should be left alone
+ *
+ * @throws IOException
+ * in case of an IO problem, for example if the watcher itself
+ * closes the underlying stream. The caller will leave the
+ * wrapped stream alone, as if <code>false</code> was returned.
+ */
+ boolean streamAbort(InputStream wrapped)
+ throws IOException
+ ;
+
+
+} // interface EofSensorWatcher