// -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- 

/*
 * Copyright (C) 1997 by the University of Southern California
 * $Id: dynalink.cc,v 1.10 2005/08/25 18:58:06 johnh Exp $
 *
 * This program 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.
 *
 * 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.
 *
 *
 * The copyright of this module includes the following
 * linking-with-specific-other-licenses addition:
 *
 * In addition, as a special exception, the copyright holders of
 * this module give you permission to combine (via static or
 * dynamic linking) this module with free software programs or
 * libraries that are released under the GNU LGPL and with code
 * included in the standard release of ns-2 under the Apache 2.0
 * license or under otherwise-compatible licenses with advertising
 * requirements (or modified versions of such code, with unchanged
 * license).  You may copy and distribute such a system following the
 * terms of the GNU GPL for this module and the licenses of the
 * other code concerned, provided that you include the source code of
 * that other code when and as the GNU GPL requires distribution of
 * source code.
 *
 * Note that people who make modified versions of this module
 * are not obligated to grant this special exception for their
 * modified versions; it is their choice whether to do so.  The GNU
 * General Public License gives permission to release a modified
 * version without this exception; this exception also makes it
 * possible to release a modified version which carries forward this
 * exception.
 *
 */

//
//      Author:         Kannan Varadhan <kannan@isi.edu>
//      Version Date:   Mon Jun 30 15:51:33 PDT 1997

#ifndef lint
static const char rcsid[] =
	"@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/link/dynalink.cc,v 1.10 2005/08/25 18:58:06 johnh Exp $ (USC/ISI)";
#endif

#include "connector.h"

// #include "packet.h"
// #include "queue.h"

class DynamicLink : public Connector {
public:
	DynamicLink() : down_(0), status_(1) { bind("status_", &status_); }
protected:
	int command(int argc, const char*const* argv);
	void recv(Packet* p, Handler* h);
	NsObject* down_;
	int status_;
};

static class DynamicLinkClass : public TclClass {
public:
	DynamicLinkClass() : TclClass("DynamicLink") {}
	TclObject* create(int, const char*const*) {
		return (new DynamicLink);
	}
} class_dynamic_link;


int DynamicLink::command(int argc, const char*const* argv)
{
	if (argc == 2) {
		if (strcmp(argv[1], "status?") == 0) {
			Tcl::instance().result(status_ ? "up" : "down");
			return TCL_OK;
		}
	}
	return Connector::command(argc, argv);
}

void DynamicLink::recv(Packet* p, Handler* h)
{
	if (status_)
		target_->recv(p, h);
	else
		drop(p);
}