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

/*

 * Copyright (c) 2007 INRIA

 * All rights reserved.

 *

 * 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 TRACE_RESOLVER_H

#define TRACE_RESOLVER_H

#include <string>

#include <list>

#include "trace-context.h"

namespace ns3 {

class CallbackBase;

/**

 * \brief the base class which is used to recursively perform trace

 *        namespace resolution.

 * \ingroup tracing

 *

 * Subclasses must implement the two pure virtal methods defined in 

 * this base class:

 *  - ns3::TraceResolver::Connect

 *  - ns3::TraceResolver::Disconnect.

 */

class TraceResolver

{

public:

  TraceResolver ();

  virtual ~TraceResolver ();

  void Ref (void);

  void Unref (void);

  /**

   * \param path the namespace path to resolver

   * \param cb the callback to connect to the matching namespace

   * \param context the context in which to store the trace context

   *

   * First, extract the leading path element from the input path, and 

   * match this leading patch element against any terminal trace source

   * contained in this trace resolver.

   * Second, recursively resolve the rest of the path using other 

   * objects if there are any.

   * If there is any TraceContextElement associated to one of the matching

   * elements, it should be added to the input TraceContext.

   */

  virtual void Connect (std::string path, CallbackBase const &cb, const TraceContext &context) = 0;

  /**

   * \param path the namespace path to resolver

   * \param cb the callback to disconnect in the matching namespace

   *

   * This method should behave as Connect.

   */

  virtual void Disconnect (std::string path, CallbackBase const &cb) = 0;

  class SourceCollection

  {

  public:

    void Print (std::ostream &os) const;

    void AddUnique (std::string path, const TraceContext &context,

                    std::string help);

  private:

    struct Source

    {

      std::string path;

      TraceContext context;

      std::string help;

    };

    typedef std::vector<struct Source> SourceVector;

    SourceVector m_sources;

  };

  virtual void CollectSources (std::string path, const TraceContext &context, 

                               SourceCollection *collection) = 0;

protected:

  /**

   * \param path a namespace path

   * \returns the initial element of the path.

   *

   * If the input path is "/foo/...", the return

   * value is "foo".

   */

  std::string GetElement (std::string path);

  /**

   * \param path a namespace path

   * \returns the subpath.

   *

   * If the input path is "/foo/bar/...", the return

   * value is "/bar/...".

   */

  std::string GetSubpath (std::string path);

private:

  uint32_t m_count;

};

}//namespace ns3

#endif /* TRACE_RESOLVER_H */