#ifndef ABSGEOMETER_HPP
#define ABSGEOMETER_HPP
//
// $Id: absGeometer.hpp,v 1.4 2002/08/25 20:24:28 melanson Exp $
//
// File: absGeometer.hpp
// Purpose: 
// Created:  4-APR-2000   John Hobbs
//
// There are two classes defined here:
//      absObservedGeometer
//      absGeometer
// Both are needed to implement the full observed, refreshable geometer.
// absObservedGeometer provides a non-templated interface for the observer 
// portion of the job.  absGeometer provides the templated sub-detector-specific
// refresh function, absRefresh.  This simply: (1) calls a virtual refresh for
// the sub-class geometer and (2) notifies all observers.
//
// $Revision: 1.4 $
//
//

// Include files
#include <vector>
#include "d0om/d0_Ref.hpp"
#include "identifiers/EnvID.hpp"
#include "geometry_system/management/absObservedGeometer.hpp"

// Global definitions
namespace dgs {

template<class T>  class absGeometer: public absObservedGeometer {
public:
  absGeometer() {}
  virtual ~absGeometer () {}

  /// Notify the geometer and observers that a new geometry should be used.
  void absRefresh(d0_Ref<const T> newdet, const edm::EnvID newid=edm::EnvID()){
    refresh(newdet);    // The order is crucial.  The geometers must be updated
    _curID = newid;     // before observers are notified of the update.
    notify_observers();
  }

  /// The concrete geometers implement this.  It is called when geometry changes
  virtual void refresh(d0_Ref<const T> newdet) = 0;

  /// Get back the current EnvID for this geoemetry
  edm::EnvID get_envid() const { return _curID; }

private:
  
  edm::EnvID _curID;

};

}
#endif //ABSGEOMETER_HPP