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

#ifndef NS3_CHANNEL_H
#define NS3_CHANNEL_H

#include <string>
#include <stdint.h>
#include "ns3/object.h"
#include "ns3/ptr.h"

namespace ns3 {

class NetDevice;

/**
 * \ingroup network
 * \defgroup channel Channel
 */
/**
 * \ingroup channel
 * \brief Abstract Channel Base Class.
 *
 * A channel is a logical path over which information flows.  The path can
 * be as simple as a short piece of wire, or as complicated as space-time.
 *
 * Subclasses must use Simulator::ScheduleWithContext to correctly update
 * event contexts when scheduling an event from one node to another one.
 */
class Channel : public Object
{
public:
  /**
   * \brief Get the type ID.
   * \return the object TypeId
   */
  static TypeId GetTypeId (void);

  Channel ();
  virtual ~Channel ();

  /**
   * \returns the unique id of this channel
   * 
   * This unique id happens to be also the index of the Channel into
   * the ChannelList. 
   */
  uint32_t GetId (void) const;

  /**
   * \returns the number of NetDevices connected to this Channel.
   *
   * This method must be implemented by subclasses.
   */
  virtual uint32_t GetNDevices (void) const = 0;
  /**
   * \param i index of NetDevice to retrieve
   * \returns one of the NetDevices connected to this channel.
   *
   * This method must be implemented by subclasses.
   */
  virtual Ptr<NetDevice> GetDevice (uint32_t i) const = 0;

private:
  uint32_t m_id; //!< Channel id for this channel
};

} // namespace ns3

#endif /* NS3_CHANNEL_H */