/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008 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
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#ifndef CCNX_FORWARDING_HELPER_H
#define CCNX_FORWARDING_HELPER_H

#include "ns3/ptr.h"
#include "ns3/nstime.h"
#include "ns3/output-stream-wrapper.h"

namespace ns3 {

class CcnxForwardingProtocol;
class Node;

/**
 * \brief a factory to create ns3::CcnxForwardingProtocol objects
 *
 * For each new forwarding protocol created as a subclass of 
 * ns3::CcnxForwardingProtocol, you need to create a subclass of 
 * ns3::CcnxForwardingHelper which can be used by 
 * ns3::InternetStackHelper::SetForwardingHelper and 
 * ns3::InternetStackHelper::Install.
 */
class CcnxForwardingHelper
{
public:
  /*
   * Destroy an instance of an CcnxForwardingHelper
   */
  virtual ~CcnxForwardingHelper ();

  /**
   * \brief virtual constructor
   * \returns pointer to clone of this CcnxForwardingHelper 
   * 
   * This method is mainly for internal use by the other helpers;
   * clients are expected to free the dynamic memory allocated by this method
   */
  virtual CcnxForwardingHelper* Copy (void) const = 0;

  /**
   * \param node the node within which the new forwarding protocol will run
   * \returns a newly-created forwarding protocol
   */
  virtual Ptr<CcnxForwardingProtocol> Create (Ptr<Node> node) const = 0;

  /**
   * \brief prints the forwarding tables of all nodes at a particular time.
   * \param printTime the time at which the forwarding table is supposed to be printed.
   * \param stream The output stream object to use 
   *
   * This method calls the PrintForwardingTable() method of the 
   * CcnxForwardingProtocol stored in the Ccnx object, for all nodes at the
   * specified time; the output format is forwarding protocol-specific.
   */
  void PrintForwardingTableAllAt (Time printTime, Ptr<OutputStreamWrapper> stream) const;

  /**
   * \brief prints the forwarding tables of all nodes at regular intervals specified by user.
   * \param printInterval the time interval for which the forwarding table is supposed to be printed.
   * \param stream The output stream object to use
   *
   * This method calls the PrintForwardingTable() method of the 
   * CcnxForwardingProtocol stored in the Ccnx object, for all nodes at the
   * specified time interval; the output format is forwarding protocol-specific.
   */
  void PrintForwardingTableAllEvery (Time printInterval, Ptr<OutputStreamWrapper> stream) const;

  /**
   * \brief prints the forwarding tables of a node at a particular time.
   * \param printTime the time at which the forwarding table is supposed to be printed.
   * \param node The node ptr for which we need the forwarding table to be printed
   * \param stream The output stream object to use
   *
   * This method calls the PrintForwardingTable() method of the 
   * CcnxForwardingProtocol stored in the Ccnx object, for the selected node 
   * at the specified time; the output format is forwarding protocol-specific.
   */
  void PrintForwardingTableAt (Time printTime, Ptr<Node> node, Ptr<OutputStreamWrapper> stream) const;

  /**
   * \brief prints the forwarding tables of a node at regular intervals specified by user.
   * \param printInterval the time interval for which the forwarding table is supposed to be printed.
   * \param node The node ptr for which we need the forwarding table to be printed
   * \param stream The output stream object to use
   *
   * This method calls the PrintForwardingTable() method of the 
   * CcnxForwardingProtocol stored in the Ccnx object, for the selected node 
   * at the specified interval; the output format is forwarding protocol-specific.
   */
  void PrintForwardingTableEvery (Time printInterval, Ptr<Node> node, Ptr<OutputStreamWrapper> stream) const;

private:
  void Print (Ptr<Node> node, Ptr<OutputStreamWrapper> stream) const;
  void PrintEvery (Time printInterval, Ptr<Node> node, Ptr<OutputStreamWrapper> stream) const;
};

} // namespace ns3


#endif /* CCNX_FORWARDING_HELPER_H */