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Common Lisp implementation running on the JVM
There is a newer version: 1.0.1
/*
 * SocketStream.java
 *
 * Copyright (C) 2004 Peter Graves
 * $Id: SocketStream.java 13442 2011-08-05 21:51:28Z ehuelsmann $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

import java.net.Socket;

public final class SocketStream extends TwoWayStream
{
    private final Socket socket;

    public SocketStream(Socket socket, Stream in, Stream out)
    {
	super(in, out);
        this.socket = socket;
    }

    @Override
    public LispObject typeOf()
    {
        return Symbol.SOCKET_STREAM;
    }

    @Override
    public LispObject classOf()
    {
        return BuiltInClass.SOCKET_STREAM;
    }

    @Override
    public LispObject typep(LispObject type)
    {
        if (type == Symbol.SOCKET_STREAM)
            return T;
        if (type == BuiltInClass.SOCKET_STREAM)
            return T;
        return super.typep(type);
    }

    @Override
    public LispObject close(LispObject abort)
    {
	try {
	    socket.close();
	    setOpen(false);
	    return T;
	} catch (Exception e) {
	    return error(new LispError(e.getMessage()));
	}
    }
}