/*
* 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.input;
import java.io.IOException;
import java.io.InputStream;
/**
* Data written to this stream is forwarded to a stream that has been associated
* with this thread.
*
* @author <a href="mailto:[email protected]">Peter Donald</a>
* @version $Revision: 736890 $ $Date: 2009-01-22 21:02:22 -0500 (Thu, 22 Jan 2009) $
*/
public class DemuxInputStream
extends InputStream
{
private final InheritableThreadLocal<InputStream> m_streams = new InheritableThreadLocal<InputStream>();
/**
* Bind the specified stream to the current thread.
*
* @param input the stream to bind
* @return the InputStream that was previously active
*/
public InputStream bindStream( InputStream input )
{
InputStream oldValue = m_streams.get();
m_streams.set( input );
return oldValue;
}
/**
* Closes stream associated with current thread.
*
* @throws IOException if an error occurs
*/
@Override
public void close()
throws IOException
{
InputStream input = m_streams.get();
if( null != input )
{
input.close();
}
}
/**
* Read byte from stream associated with current thread.
*
* @return the byte read from stream
* @throws IOException if an error occurs
*/
@Override
public int read()
throws IOException
{
InputStream input = m_streams.get();
if( null != input )
{
return input.read();
}
else
{
return -1;
}
}
}
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