Commons IO example source code file (DemuxInputStream.java)

This example Commons IO source code file (DemuxInputStream.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

demuxinputstream, inheritablethreadlocal, inheritablethreadlocal, inputstream, inputstream, io, ioexception, ioexception, override, override

The Commons IO DemuxInputStream.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.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:peter@apache.org">Peter Donald
 * @version $Revision: 736890 $ $Date: 2009-01-23 02:02:22 +0000 (Fri, 23 Jan 2009) $
 */
public class DemuxInputStream
    extends InputStream
{
    private final InheritableThreadLocal<InputStream> m_streams = new InheritableThreadLocal();

    /**
     * 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;
        }
    }
}