/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013 University of California, Los Angeles
 *
 * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 *       : Saran Tarnoi <saran.tarnoi@gmail.com>
 */

#ifndef NDN_LINK_CONTROL_HELPER_H
#define NDN_LINK_CONTROL_HELPER_H

#include "ns3/ptr.h"
#include "ns3/node.h"

namespace ns3 {
namespace ndn {

/**
 * @brief Helper class to control the up or down statuss of an NDN link connecting two specific nodes
 * @ingroup Ndn
 */
class LinkControlHelper
{ 
public:
  /**
   * @brief Fail NDN link between two nodes
   *
   * The helper will attempt to find NDN link between node1 and
   * node2 and set NDN face to DOWN state
   *
   * Note that only PointToPointChannels are supported by this helper method
   *
   * @param node1 one node
   * @param node2 another node
   */
  static void
  FailLink (Ptr<Node> node1, Ptr<Node> node2);

  /**
   * @brief Fail NDN link between two nodes
   *
   * The helper will attempt to find NDN link between node1 and
   * node2 and set NDN face to DOWN state
   *
   * Note that only PointToPointChannels are supported by this helper method
   *
   * This variant uses node names registered by Names class
   *
   * @param node1 one node's name
   * @param node2 another node's name
   */
  static void
  FailLinkByName (const std::string &node1, const std::string &node2);

  /**
   * @brief Re-enable NDN link between two nodes
   *
   * The helper will attempt to find NDN link between node1 and
   * node2 and set NDN face to UP state
   *
   * Note that only PointToPointChannels are supported by this helper method
   *
   * @param node1 one node
   * @param node2 another node
   */
  static void
  UpLink (Ptr<Node> node1, Ptr<Node> node2);
  
  /**
   * @brief Re-enable NDN link between two nodes
   *
   * The helper will attempt to find NDN link between node1 and
   * node2 and set NDN face to UP state
   *
   * Note that only PointToPointChannels are supported by this helper method
   *
   * This variant uses node names registered by Names class
   *
   * @param node1 one node's name
   * @param node2 another node's name
   */
  static void
  UpLinkByName (const std::string &node1, const std::string &node2);
}; // end: LinkControlHelper


} // ndn
} // ns3

#endif // NDN_LINK_CONTROL_HELPER_H