#ifndef ABSRCPGEOMETER_HPP
#define ABSRCPGEOMETER_HPP
//
// $Id: absRcpGeometer.hpp,v 1.7 2001/06/14 19:10:00 hobbs Exp $
//
// File: absRcpGeometer.hpp
// Purpose: An abstract base class for geometers which receive version 
//   information via RCP (for now, the ChannelGeometer and MaterialGeometer
//   for each subdector.   This base class provides support for:
//     
//      (1) RCP parameter version tracking by dependent code via the RCPID
//          portion of the interface, and
//      (2) Notification that new RCP parameters might be needed.  Whenever
//          the overall geometry manager detects a possible version change 
//          in the input event data (history chunk for MC or run number for
//          other data), the method absRefresh is called.   This first calls
//          the subdetector specific checkVersion, passing it version
//          information.   If a new RCP is needed, the subdetector code should
//          return a pointer to the RCP object.   absRefresh then updates the
//          RCPID and calls the subdetector specific refresh method if a new
//          RCP is required.
//
//    Subdetectors should override the refresh and checkVersion code.  Dummy
//    checkVersion code is supplied which simply return "no change needed"
//    for every call.
//
//   Although it's probably unnecessary, this inherits from 
//   absObservedGeometer to allow direct notification of RCP changes to 
//   dependent classes
//
// Created:  9-NOV-2000   John Hobbs
//
// $Revision: 1.7 $
//
//

// Include files and forward references
#include "rcp/RCPID.hpp"
#include "rcp/RCP.hpp"
#include "geometry_system/management/absObservedGeometer.hpp"
namespace edm {
 class Event;
}

// Global definitions
namespace dgs {

class absRcpGeometer: public absObservedGeometer {
public:

  /// Constructor.  Registers the Geometer
  absRcpGeometer();

  /// Destructor. Unregisters the Geometer
  ~absRcpGeometer();

  /// Retrieve the RCPID of the current RCP
  edm::RCPID id() const;

  /**
      Called by the overall geometry synchronization code (GeometerManager)
      if new RCP information could possibly be needed.

      Currently the information includes the history chunks version string 
      for  pmc, psim, t (test release), p (unified production release) and 
      preco.  In addition, the run number is provided.   The flag isMC is 
      TRUE for MC data.  Currently Monte Carlo data is anything with a MCKINE,
      PMC or PSIM history chunk.  If none are present, the event is assumed 
      to be COLLIDER DATA.
  **/
  bool absRefresh(const bool isMC, const int runNumber,
		  const std::vector<std::string>& versions,
		  const edm::Event *anEvt=0);

  /// Force a change of constants without subdetector input.  Use at initialize
  bool absRefresh(const edm::RCP* newRCP);

  /** 
      Check the event version information passed as an arguement to see if a 
      new RCP is needed.  If it is, return a pointer to the new RCP.  If not,
      return an emptry RCPID.  The default implementation never triggers a 
      change in parameters.

      See absRefresh (above) for a description of the parameters.
  **/
  virtual edm::RCP* check_version(const bool isMC, const int runNumber,
				  const std::vector<std::string>& versions,
				  const edm::Event *anEvt=0);


  /// Do I want to be call every event?
  bool check_every_event() const { return _check_every_event; }

protected:

  virtual bool refresh(const edm::RCP* newRCP)=0;
  bool _check_every_event;

private:

  edm::RCPID d_currentRCP;

};

}
#endif //ABSRCPGEOMETER_HPP