#ifndef RCPGEOMETERREGISTRY_HPP
#define RCPGEOMETERREGISTRY_HPP
//
// $Id: RcpGeometerRegistry.hpp,v 1.3 2001/06/14 21:04:16 hobbs Exp $
//
// File: RcpGeometerRegistry.hpp
// Purpose: Each instance of an absRcpGeometer will automatically call the
//   register method of this singleton.  The class(es) responsible for updating
//   constants can get a list of a Geometer's from the registry when an update
//   is possible
// Created: 29-NOV-2000   John Hobbs
//
// $Revision: 1.3 $
//
//

// Include files
#include <set>
#include <map>
#include "identifiers/RCPID.hpp"

namespace dgs {
class absRcpGeometer;

// Global definitions
class RcpGeometerRegistry {
public:

  /// Get the (sole) copy of the registry
  static RcpGeometerRegistry* get_instance();

  /// Add a Geometer to the list of known geometers
  bool add(absRcpGeometer *aGeometer);

  /// Remove a Geometer from the list of know geometers
  bool remove(absRcpGeometer *aGeometer);

  /// Get the list of known geometers
  std::set<absRcpGeometer*> known_geometers() const;

  /// Get the RCPID's of the currently loaded parameter sets for all geometers
  const std::map<absRcpGeometer*,edm::RCPID>* environment() const;

  /// When an RCP geometer is refreshed, it calls this method to update the list
  bool update_environment(absRcpGeometer* aGeometer, edm::RCPID& itsID);

private:

  RcpGeometerRegistry() {};
  ~RcpGeometerRegistry() { _theInstance=0; }

  /// The pointer to the sole instance of this class
  static RcpGeometerRegistry* _theInstance;

  /// The known geometers
  std::map<absRcpGeometer*,edm::RCPID> d_geometers;

  /// satisfy the old interface.  Only use this is it's explicitly needed
  mutable std::set<absRcpGeometer*> d_tmp;
};
}

// Constructors/Destructors

// Accessors

#endif //RCPGEOMETERREGISTRY_HPP