/*
 * Copyright 2007-2010 Sun Microsystems, Inc.
 *
 * This file is part of Project Darkstar Server.
 *
 * Project Darkstar Server is free software: you can redistribute it
 * and/or modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation and
 * distributed hereunder to you.
 *
 * Project Darkstar Server is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * --
 */

package com.sun.sgs.system;

import java.io.OutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.logging.Logger;
import java.util.logging.Level;

/**
 * Reads input from a given {@code InputStream} and pipes it directly to a
 * given {@code OutputStream}.
 */
public class StreamPipe implements Runnable {
    
    private static final Logger logger = 
            Logger.getLogger(StreamPipe.class.getName());
    
    private final InputStream input;
    private final OutputStream output;
    
    /**
     * Constructs a new {@code StreamPipe}.
     * 
     * @param input the input stream to read from
     * @param output the output stream to write to
     */
    public StreamPipe(InputStream input, OutputStream output) {
        this.input = input;
        this.output = output;
    }
    
    /**
     * Reads the output from the {@code InputStream} associated with this object
     * and outputs the results to the {@code OutputStream} associated with
     * this object.
     */
    public void run() {
        byte[] buf = new byte[1024];
        int count;
        try {
            while ((count = input.read(buf)) != -1) {
                output.write(buf, 0, count);
                output.flush();
            }
        } catch (IOException e) {
            logger.log(Level.FINEST, "Input closed", e);
        } 
    }

}