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

/*

 * Copyright (c) 2007 INRIA

 *

 * 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

 *

 * Authors: 

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

 */

#include "ns3/simulator.h"

#include "ns3/object-vector.h"

#include "ns3/config.h"

#include "ns3/log.h"

#include "node-list.h"

#include "node.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("NodeList");

/**

 * \brief private implementation detail of the NodeList API.

 */

class NodeListPriv : public Object

{

public:

  static TypeId GetTypeId (void);

  NodeListPriv ();

  ~NodeListPriv ();

  uint32_t Add (Ptr<Node> node);

  NodeList::Iterator Begin (void) const;

  NodeList::Iterator End (void) const;

  Ptr<Node> GetNode (uint32_t n);

  uint32_t GetNNodes (void);

  static Ptr<NodeListPriv> Get (void);

private:

  static Ptr<NodeListPriv> *DoGet (void);

  static void Delete (void);

  std::vector<Ptr<Node> > m_nodes;

};

NS_OBJECT_ENSURE_REGISTERED (NodeListPriv);

TypeId 

NodeListPriv::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::NodeListPriv")

    .SetParent<Object> ()

    .AddAttribute ("NodeList", "The list of all nodes created during the simulation.",

                   MakeObjectVectorAccessor (&NodeListPriv::m_nodes),

                   MakeObjectVectorChecker<Node> ())

    ;

  return tid;

}

Ptr<NodeListPriv> 

NodeListPriv::Get (void)

{

  return *DoGet ();

}  

Ptr<NodeListPriv> *

NodeListPriv::DoGet (void)

{

  static Ptr<NodeListPriv> ptr = 0;

  if (ptr == 0)

    {

      ptr = CreateObject<NodeListPriv> ();

      Config::RegisterRootNamespaceObject (ptr);

      Simulator::ScheduleDestroy (&NodeListPriv::Delete);

    }

  return &ptr;

}

void 

NodeListPriv::Delete (void)

{

  NS_LOG_FUNCTION;

  Config::UnregisterRootNamespaceObject (Get ());

  (*DoGet ()) = 0;

}

NodeListPriv::NodeListPriv ()

{

  NS_LOG_FUNCTION;

}

NodeListPriv::~NodeListPriv ()

{

  NS_LOG_FUNCTION;

  for (std::vector<Ptr<Node> >::iterator i = m_nodes.begin ();

       i != m_nodes.end (); i++)

    {

      Ptr<Node> node = *i;

      node->Dispose ();

      *i = 0;

    }

  m_nodes.erase (m_nodes.begin (), m_nodes.end ());

}

uint32_t

NodeListPriv::Add (Ptr<Node> node)

{

  uint32_t index = m_nodes.size ();

  m_nodes.push_back (node);

  return index;

}

NodeList::Iterator 

NodeListPriv::Begin (void) const

{

  return m_nodes.begin ();

}

NodeList::Iterator 

NodeListPriv::End (void) const

{

  return m_nodes.end ();

}

uint32_t 

NodeListPriv::GetNNodes (void)

{

  return m_nodes.size ();

}

Ptr<Node>

NodeListPriv::GetNode (uint32_t n)

{

  return m_nodes[n];

}

}

/**

 * The implementation of the public static-based API

 * which calls into the private implementation through

 * the simulation singleton.

 */

namespace ns3 {

uint32_t

NodeList::Add (Ptr<Node> node)

{

  return NodeListPriv::Get ()->Add (node);

}

NodeList::Iterator 

NodeList::Begin (void)

{

  return NodeListPriv::Get ()->Begin ();

}

NodeList::Iterator 

NodeList::End (void)

{

  return NodeListPriv::Get ()->End ();

}

Ptr<Node>

NodeList::GetNode (uint32_t n)

{

  return NodeListPriv::Get ()->GetNode (n);

}

}//namespace ns3