/* -*- 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

 *

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

 */

#ifndef CONFIG_H

#define CONFIG_H

#include "ptr.h"

#include <string>

#include <vector>

namespace ns3 {

class AttributeValue;

class Object;

class CallbackBase;

/**

 * \brief Configuration of simulation parameters and tracing

 * \ingroup core

 */

namespace Config {

/**

 * \param path a path to match attributes.

 * \param value the value to set in all matching attributes.

 *

 * This function will attempt to find attributes which

 * match the input path and will then set their value to the input

 * value.

 */

void Set (std::string path, const AttributeValue &value);

/**

 * \param name the full name of the attribute

 * \param value the value to set.

 *

 * This method overrides the initial value of the 

 * matching attribute. This method cannot fail: it will

 * crash if the input attribute name or value is invalid.

 */

void SetDefault (std::string name, const AttributeValue &value);

/**

 * \param name the full name of the attribute

 * \param value the value to set.

 * \returns true if the value was set successfully, false otherwise.

 *

 * This method overrides the initial value of the 

 * matching attribute. 

 */

bool SetDefaultFailSafe (std::string name, const AttributeValue &value);

/**

 * \param name the name of the requested GlobalValue.

 * \param value the value to set

 *

 * This method is equivalent to GlobalValue::Bind

 */

void SetGlobal (std::string name, const AttributeValue &value);

/**

 * \param name the name of the requested GlobalValue.

 * \param value the value to set

 *

 * This method is equivalent to GlobalValue::BindFailSafe

 */

bool SetGlobalFailSafe (std::string name, const AttributeValue &value);

/**

 * \param path a path to match trace sources.

 * \param cb the callback to connect to the matching trace sources.

 *

 * This function will attempt to find all trace sources which

 * match the input path and will then connect the input callback

 * to them.

 */

void ConnectWithoutContext (std::string path, const CallbackBase &cb);

/**

 * \param path a path to match trace sources.

 * \param cb the callback to disconnect to the matching trace sources.

 *

 * This function undoes the work of Config::Connect.

 */

void DisconnectWithoutContext (std::string path, const CallbackBase &cb);

/**

 * \param path a path to match trace sources.

 * \param cb the callback to connect to the matching trace sources.

 *

 * This function will attempt to find all trace sources which

 * match the input path and will then connect the input callback

 * to them in such a way that the callback will receive an extra

 * context string upon trace event notification.

 */

void Connect (std::string path, const CallbackBase &cb);

/**

 * \param path a path to match trace sources.

 * \param cb the callback to connect to the matching trace sources.

 *

 * This function undoes the work of Config::ConnectWithContext.

 */

void Disconnect (std::string path, const CallbackBase &cb);

/**

 * \brief hold a set of objects which match a specific search string.

 *

 * This class also allows you to perform a set of configuration operations

 * on the set of matching objects stored in the container. Specifically,

 * it is possible to perform bulk Connects and Sets.

 */

class MatchContainer

{

public:

  typedef std::vector<Ptr<Object> >::const_iterator Iterator;

  MatchContainer ();

  // constructor used only by implementation.

  MatchContainer (const std::vector<Ptr<Object> > &objects, 

                  const std::vector<std::string> &contexts, 

                  std::string path);

  /**

   * \returns an iterator which points to the first item in the container

   */

  MatchContainer::Iterator Begin (void) const;

  /**

   * \returns an iterator which points to the last item in the container

   */

  MatchContainer::Iterator End (void) const;

  /**

   * \returns the number of items in the container

   */

  uint32_t GetN (void) const;

  /**

   * \param i index of item to lookup ([0,n[)

   * \returns the item requested.

   */

  Ptr<Object> Get (uint32_t i) const;

  /**

   * \param i index of item to lookup ([0,n[)

   * \returns the fully-qualified matching path associated

   *          to the requested item.

   *

   * The matching patch uniquely identifies the requested object.

   */

  std::string GetMatchedPath (uint32_t i) const;

  /**

   * \returns the path used to perform the object matching.

   */

  std::string GetPath (void) const;

  /**

   * \param name name of attribute to set

   * \param value value to set to the attribute

   *

   * Set the specified attribute value to all the objects stored in this

   * container.

   * \sa ns3::Config::Set

   */

  void Set (std::string name, const AttributeValue &value);

  /**

   * \param name the name of the trace source to connect to

   * \param cb the sink to connect to the trace source

   *

   * Connect the specified sink to all the objects stored in this

   * container.

   * \sa ns3::Config::Connect

   */

  void Connect (std::string name, const CallbackBase &cb);

  /**

   * \param name the name of the trace source to connect to

   * \param cb the sink to connect to the trace source

   *

   * Connect the specified sink to all the objects stored in this

   * container.

   */

  void ConnectWithoutContext (std::string name, const CallbackBase &cb);

  /**

   * \param name the name of the trace source to disconnect from

   * \param cb the sink to disconnect from the trace source

   *

   * Disconnect the specified sink from all the objects stored in this

   * container.

   * \sa ns3::Config::Disconnect

   */

  void Disconnect (std::string name, const CallbackBase &cb);

  /**

   * \param name the name of the trace source to disconnect from

   * \param cb the sink to disconnect from the trace source

   *

   * Disconnect the specified sink from all the objects stored in this

   * container.

   * \sa ns3::Config::DisconnectWithoutContext

   */

  void DisconnectWithoutContext (std::string name, const CallbackBase &cb);

private:

  std::vector<Ptr<Object> > m_objects;

  std::vector<std::string> m_contexts;

  std::string m_path;

};

/**

 * \param path the path to perform a match against

 * \returns a container which contains all the objects which match the input

 *          path.

 */

MatchContainer LookupMatches (std::string path);

/**

 * \param obj a new root object

 *

 * Each root object is used during path matching as

 * the root of the path by Config::Connect, and Config::Set.

 */

void RegisterRootNamespaceObject (Ptr<Object> obj);

/**

 * \param obj a new root object

 *

 * This function undoes the work of Config::RegisterRootNamespaceObject.

 */

void UnregisterRootNamespaceObject (Ptr<Object> obj);

/**

 * \returns the number of registered root namespace objects.

 */

uint32_t GetRootNamespaceObjectN (void);

/**

 * \param i the index of the requested object.

 * \returns the requested root namespace object

 */

Ptr<Object> GetRootNamespaceObject (uint32_t i);

} // namespace Config

} // namespace ns3

#endif /* CONFIG_H */