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Artifact for the refcodes forward secrecy framework design.
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/**
 * As of "https://github.com/dfish3r/vt-crypt2 "CRYPT" (vt-crypt2) the source
 * code below the package "edu.vt.middleware.crypt" is dual licensed under both
 * the LGPL and Apache 2 license. As REFCODES.ORG source codes are also licensed
 * under the Apache License, v2.0
 * ("http://www.apache.org/licenses/TEXT-2.0"), the according Apache 2
 * license principles are to be applied: "... The Apache License is permissive;
 * unlike copyleft licenses, it does not require a derivative work of the
 * software, or modifications to the original, to be distributed using the same
 * license. It still requires application of the same license to all unmodified
 * parts. In every licensed file, original copyright, patent, trademark, and
 * attribution notices must be preserved (excluding notices that do not pertain
 * to any part of the derivative works.) In every licensed file changed, a
 * notification must be added stating that changes have been made to that
 * file..." ("https://en.wikipedia.org/wiki/Apache_License")
 * 
 * "Software can be freely used, modified and distributed in any environment
 * under this license."
 * 
"A copy of the license must be included in the package." (→ see
 * refcodes-licensing dependency)
 * 
"Changes to the source code of the software under the Apache license do
 * not have to be sent back to the licensor."
 * 
"Own software that uses software under the Apache license does not have
 * to be under the Apache license."
 * 
"Your own software may only be called Apache if the Apache Foundation has
 * given written permission."
 * 
 * (freely translated from "https://de.wikipedia.org/wiki/Apache_License")
 */

/*
 * $Id: TeePrintStream.java 2745 2013-06-25 21:16:10Z dfisher $
 * 
 * Copyright (C) 2003-2013 Virginia Tech. All rights reserved.
 * 
 * SEE TEXT FOR MORE INFORMATION
 * 
 * Author: Middleware Services Email: [email protected] Version: $Revision: 2745
 * $ Updated: $Date: 2013-06-25 17:16:10 -0400 (Tue, 25 Jun 2013) $
 */
package edu.vt.middleware.crypt.io;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

/**
 * Works like the Unix tee utility by writing to two streams
 * simultaneously, where one is typically STDOUT or STDERR.
 *
 * @author Middleware Services
 * 
 * @version $Revision: 2745 $
 */
public class TeePrintStream extends PrintStream {

	/** Other output stream. */
	private final OutputStream other;

	/**
	 * Creates a tee stream that writes to both of the given streams
	 * simultaneously. To operate like the Unix tee, the second
	 * stream should be STDOUT or STDERR.
	 *
	 * @param out1 Primary output stream.
	 * @param out2 Secondary output stream, usually System.out or
	 *        System.err.
	 */
	public TeePrintStream( final OutputStream out1, final OutputStream out2 ) {
		super( out1 );
		other = out2;
	}

	/** {@inheritDoc} */
	public void write( final int b ) {
		super.write( b );
		try {
			other.write( b );
		}
		catch ( IOException e ) {
			throw new RuntimeException( "Error writing to secondary stream." );
		}
	}

	/** {@inheritDoc} */
	public void write( final byte[] buf, final int off, final int len ) {
		super.write( buf, off, len );
		try {
			other.write( buf, off, len );
		}
		catch ( IOException e ) {
			throw new RuntimeException( "Error writing to secondary stream." );
		}
	}

	/** {@inheritDoc} */
	public void flush() {
		super.flush();
		try {
			other.flush();
		}
		catch ( IOException e ) {
			throw new RuntimeException( "Error flushing secondary stream." );
		}
	}
}