106 lines
2.9 KiB
Java
106 lines
2.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.io.output;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* Data written to this stream is forwarded to a stream that has been associated
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* with this thread.
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*
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* @author <a href="mailto:peter@apache.org">Peter Donald</a>
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* @version $Revision: 437567 $ $Date: 2006-08-28 07:39:07 +0100 (Mon, 28 Aug 2006) $
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*/
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public class DemuxOutputStream
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extends OutputStream
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{
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private InheritableThreadLocal<OutputStream> m_streams = new InheritableThreadLocal<OutputStream>();
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/**
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* Bind the specified stream to the current thread.
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*
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* @param output the stream to bind
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* @return the OutputStream that was previously active
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*/
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public OutputStream bindStream( OutputStream output )
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{
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OutputStream stream = getStream();
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m_streams.set( output );
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return stream;
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}
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/**
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* Closes stream associated with current thread.
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*
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* @throws IOException if an error occurs
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*/
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@Override
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public void close()
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throws IOException
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{
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OutputStream output = getStream();
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if( null != output )
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{
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output.close();
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}
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}
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/**
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* Flushes stream associated with current thread.
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*
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* @throws IOException if an error occurs
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*/
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@Override
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public void flush()
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throws IOException
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{
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OutputStream output = getStream();
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if( null != output )
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{
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output.flush();
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}
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}
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/**
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* Writes byte to stream associated with current thread.
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*
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* @param ch the byte to write to stream
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* @throws IOException if an error occurs
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*/
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@Override
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public void write( int ch )
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throws IOException
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{
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OutputStream output = getStream();
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if( null != output )
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{
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output.write( ch );
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}
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}
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/**
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* Utility method to retrieve stream bound to current thread (if any).
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*
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* @return the output stream
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*/
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private OutputStream getStream()
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{
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return m_streams.get();
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}
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}
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