Commons IO example source code file (DemuxOutputStream.java)

This example Commons IO source code file (DemuxOutputStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons IO tags/keywords

demuxoutputstream, inheritablethreadlocal, inheritablethreadlocal, io, ioexception, ioexception, outputstream, outputstream, override, override

The Commons IO DemuxOutputStream.java source code

/*
 * 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.
 *
 * @author <a href="mailto:peter@apache.org">Peter Donald
 * @version $Revision: 736890 $ $Date: 2009-01-23 02:02:22 +0000 (Fri, 23 Jan 2009) $
 */
public class DemuxOutputStream
    extends OutputStream
{
    private final InheritableThreadLocal<OutputStream> 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 );
        }
    }
}