/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2005 INRIA

 * All rights reserved.

 *

 * 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

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "scheduler-list.h"

#include "scheduler-factory.h"

#include "event-impl.h"

#include <utility>

#include <string>

#include "ns3/assert.h"

namespace ns3 {

static class SchedulerListFactory : public SchedulerFactory 

{

public:

  SchedulerListFactory ()

  {

    SchedulerFactory::AddDefault (this, "List");

  }

private:

  virtual Scheduler *DoCreate (void) const

  {

    return new SchedulerList ();

  }

} g_schedulerListFactory;

SchedulerList::SchedulerList ()

{}

SchedulerList::~SchedulerList ()

{}

bool 

SchedulerList::IsLower (Scheduler::EventKey const*a, Scheduler::EventKey const*b) const

{

  if (a->m_ts < b->m_ts)

    {

      return true;

    }

  else if (a->m_ts == b->m_ts &&

           a->m_uid < b->m_uid)

    {

      return true;

    }

  else

    {

      return false;

    }

}

void

SchedulerList::RealInsert (EventId id)

{

  Scheduler::EventKey key;

  key.m_ts = id.GetTs ();

  key.m_uid = id.GetUid ();

  for (EventsI i = m_events.begin (); i != m_events.end (); i++) 

    {

      if (IsLower (&key, &i->second))

        {

          m_events.insert (i, std::make_pair (event, key));

          return;

        }

    }

  m_events.push_back (std::make_pair (event, key));

}

bool 

SchedulerList::RealIsEmpty (void) const

{

  return m_events.empty ();

}

EventId

SchedulerList::RealPeekNext (void) const

{

  std::pair<EventImpl *, EventKey> next = m_events.front ();

  return EventId (next.first, next.second.m_ts, next.second.m_uid);

}

void

SchedulerList::RealRemoveNext (void)

{

  m_events.pop_front ();

}

bool

SchedulerList::RealRemove (EventId id)

{

  for (EventsI i = m_events.begin (); i != m_events.end (); i++) 

    {

      if (i->second.m_uid == id.GetUid ())

        {

          m_events.erase (i);

          return true;

        }

    }

  NS_ASSERT (false);

  return false;

}

}; // namespace ns3