StreamTee.java

/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  This program 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.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.LinkedList;
import java.util.List;

public class StreamTee extends InputStream {
    private InputStream in;
    private List<OutputStream> forked = new LinkedList<OutputStream>();
    private boolean readeof = false;
    private boolean ncwe = false; /* NCWE = No Close Without EOF */
    
    public StreamTee(InputStream in) {
	this.in = in;
    }
    
    public int available() throws IOException {
	return(in.available());
    }
    
    public void close() throws IOException {
	in.close();
	if(!ncwe || readeof) {
	    synchronized(forked) {
		for(OutputStream s : forked)
		    s.close();
	    }
	}
    }
    
    public void setncwe() {
	ncwe = true;
    }
    
    public void flush() throws IOException {
	synchronized(forked) {
	    for(OutputStream s : forked)
		s.flush();
	}
    }
    
    public void mark(int limit) {}
    
    public boolean markSupported() {
	return(false);
    }
    
    public int read() throws IOException {
	int rv = in.read();
	if(rv >= 0) {
	    synchronized(forked) {
		for(OutputStream s : forked)
		    s.write(rv);
	    }
	} else {
	    readeof = true;
	}
	return(rv);
    }
    
    public int read(byte[] buf, int off, int len) throws IOException {
	int rv = in.read(buf, off, len);
	if(rv > 0) {
	    synchronized(forked) {
		for(OutputStream s : forked)
		    s.write(buf, off, rv);
	    }
	} else {
	    readeof = true;
	}
	return(rv);
    }
    
    public void reset() throws IOException {
	throw(new IOException("Mark not supported on StreamTee"));
    }
    
    public void attach(OutputStream s) {
	synchronized(forked) {
	    forked.add(s);
	}
    }
}