/*
 * upstreamnotifier.{cc,hh} -- a nonfull_notifier
 * John Bicket
 *
 * Copyright (c) 2004 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include <click/confparse.hh>
#include <click/error.hh>
#include <click/error.hh>
#include <click/glue.hh>
#include "upstreamnotifier.hh"
CLICK_DECLS

UpstreamNotifier::UpstreamNotifier()
{
}

UpstreamNotifier::~UpstreamNotifier()
{
}

void *
UpstreamNotifier::cast(const char *n)
{
    if (strcmp(n, "UpstreamNotifier") == 0)
	return (Element *) this;
    else if (strcmp(n, Notifier::FULL_NOTIFIER) == 0)
	return static_cast<Notifier *>(&_notifier);
    else
	return 0;
}

int
UpstreamNotifier::configure(Vector<String> &conf, ErrorHandler *errh)
{
    bool signal;
    _notifier.initialize(Notifier::FULL_NOTIFIER, router());

    if (cp_va_kparse(conf, this, errh,
		     "SIGNAL", cpkP+cpkM, cpBool, &signal,
		     cpEnd) < 0)
	return -1;

    _notifier.set_active(signal, false);
    return 0;
}

void
UpstreamNotifier::push(int p, Packet *p_in)
{
    output(p).push(p_in);
}

enum { H_SIGNAL };

static String
read_param(Element *e, void *thunk)
{
    UpstreamNotifier *f = (UpstreamNotifier *)e;
    switch ((uintptr_t) thunk) {
      case H_SIGNAL: return String(f->_notifier.active());
    }
    return String();
}

static int
write_param(const String &s, Element *e, void *vparam,
	    ErrorHandler *errh)
{
    UpstreamNotifier *f = (UpstreamNotifier *)e;
    switch ((intptr_t) vparam) {
      case H_SIGNAL: {
	  bool signal;
	  if (!cp_bool(s, &signal))
	      return errh->error("signal parameter must be boolean");
	  f->_notifier.set_active(signal, true);
	  break;
      }
    }
    return 0;
}

void
UpstreamNotifier::add_handlers()
{
    add_write_handler("signal", write_param, H_SIGNAL, Handler::CHECKBOX);
    add_read_handler("signal", read_param, H_SIGNAL);
}

CLICK_ENDDECLS
EXPORT_ELEMENT(UpstreamNotifier)
