com.groupbyinc.common.util.io.output.DemuxOutputStream Maven / Gradle / Ivy
/*
* 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.commons.io.output;
import java.io.IOException;
import java.io.OutputStream;
/**
* Data written to this stream is forwarded to a stream that has been associated
* with this thread.
*
* @version $Id: DemuxOutputStream.java 1302056 2012-03-18 03:03:38Z ggregory $
*/
public class DemuxOutputStream
extends OutputStream
{
private final InheritableThreadLocal m_streams = new InheritableThreadLocal();
/**
* Bind the specified stream to the current thread.
*
* @param output the stream to bind
* @return the OutputStream that was previously active
*/
public OutputStream bindStream( OutputStream output )
{
OutputStream stream = m_streams.get();
m_streams.set( output );
return stream;
}
/**
* Closes stream associated with current thread.
*
* @throws IOException if an error occurs
*/
@Override
public void close()
throws IOException
{
OutputStream output = m_streams.get();
if( null != output )
{
output.close();
}
}
/**
* Flushes stream associated with current thread.
*
* @throws IOException if an error occurs
*/
@Override
public void flush()
throws IOException
{
OutputStream output = m_streams.get();
if( null != output )
{
output.flush();
}
}
/**
* Writes byte to stream associated with current thread.
*
* @param ch the byte to write to stream
* @throws IOException if an error occurs
*/
@Override
public void write( int ch )
throws IOException
{
OutputStream output = m_streams.get();
if( null != output )
{
output.write( ch );
}
}
}