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

/*

 * Copyright (c) 2009, 2010 MIRKO BANCHI

 *

 * 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: Mirko Banchi <mk.banchi@gmail.com>

 * Author: Tommaso Pecorella <tommaso.pecorella@unifi.it>

 */

#include "originator-block-ack-agreement.h"

namespace ns3 {

OriginatorBlockAckAgreement::OriginatorBlockAckAgreement ()

  : BlockAckAgreement (),

    m_state (PENDING),

    m_sentMpdus (0),

    m_needBlockAckReq (false)

{

}

OriginatorBlockAckAgreement::OriginatorBlockAckAgreement (Mac48Address recipient, uint8_t tid)

  : BlockAckAgreement (recipient, tid),

    m_state (PENDING),

    m_sentMpdus (0),

    m_needBlockAckReq (false)

{

}

OriginatorBlockAckAgreement::~OriginatorBlockAckAgreement ()

{

}

void

OriginatorBlockAckAgreement::SetState (enum State state)

{

  m_state = state;

  if (state == INACTIVE)

    {

      m_needBlockAckReq = false;

      m_sentMpdus = 0;

    }

}

bool

OriginatorBlockAckAgreement::IsPending (void) const

{

  return (m_state == PENDING) ? true : false;

}

bool

OriginatorBlockAckAgreement::IsEstablished (void) const

{

  return (m_state == ESTABLISHED) ? true : false;

}

bool

OriginatorBlockAckAgreement::IsInactive (void) const

{

  return (m_state == INACTIVE) ? true : false;

}

bool

OriginatorBlockAckAgreement::IsUnsuccessful (void) const

{

  return (m_state == UNSUCCESSFUL) ? true : false;

}

void

OriginatorBlockAckAgreement::NotifyMpduTransmission (uint16_t nextSeqNumber)

{

  NS_ASSERT (m_sentMpdus < m_bufferSize);

  m_sentMpdus++;

  uint16_t delta = (nextSeqNumber - m_startingSeq + 4096) % 4096;

  uint16_t min = m_bufferSize < 64 ? m_bufferSize : 64;

  if (delta >= min || m_sentMpdus == m_bufferSize)

    {

      m_needBlockAckReq = true;

    }

}

bool

OriginatorBlockAckAgreement::IsBlockAckRequestNeeded (void) const

{

  return m_needBlockAckReq;

}

void

OriginatorBlockAckAgreement::CompleteExchange (void)

{

  m_needBlockAckReq = false;

  m_sentMpdus = 0;

}

} // namespace ns3