// -*- mode: c++ -*- 
//
// $Id: BrCalibrationManager.h,v 1.1 2001/10/08 10:40:32 cholm Exp $
//
#ifndef BRAT_BrCalibrationManager
#define BRAT_BrCalibrationManager
#ifndef ROOT_TObject
#include "TObject.h"
#endif
#ifndef ROOT_TObjArray
#include "TObjArray.h"
#endif
class BrCalibration;
#ifndef BRAT_BrCalibration
#include "BrCalibration.h"
#endif

//_______________________________________________________________________
//
// This class is used only by the manager class.
// The objects are used to maintain what databases objects has been
// loaded via this mechanism.
//
class BrDbElement : public TObject 
{
public:
  BrDbElement(){};
  BrDbElement(const Char_t* classname, 
	      const Char_t* detectorname, 
	      TObject* obj);
  ~BrDbElement();
private:
  Char_t   fClassName[80];        // ClassName for database object
  Char_t   fDetectorName[80];      // Identifier of detector/magnet name
  TObject* fParameterElement;     // Pointer to database object.
public:
  friend class BrCalibrationManager;
  friend ostream& operator << (ostream& os, BrDbElement* dbobj);

  void   Print(Option_t* option="") const; 
  ClassDef(BrDbElement,0) // BRAHMS Database  object
}
;


//_______________________________________________________________________
class BrCalibrationManager : public TObject 
{
private:
  enum DbStatus_t {
    INIT, 
    OPEN, 
    DEFAULT_PARAMETER_SET
  };
public:
  static BrCalibrationManager* Instance();
  
  // Root is not happy with the protected for the constructor. 
  // i.e. one cannot invoke the TBrowser. The destructor also
  // has be public otherwise CINT complains.
protected:
  BrCalibrationManager();
public:
  ~BrCalibrationManager();
  BrCalibration* BrCalibrationManager::Register(const
							  Char_t*
							  classname,  
							  const
							  Char_t* 
							  detector); 

  void Print(Option_t* option="L") const;
  void Init();
  void Update(){};
  void Update(Int_t , Int_t);
  void Commit(Int_t , Int_t);

  Int_t DebugLevel() const {return fDebugLevel;}
  void SetDebugLevel(Int_t level) {fDebugLevel=level;}

private:
  BrDbElement* GetDbElement(const Char_t* classname, const Char_t* detector);
  TObjArray*   fObjectlist;       // List 
  DbStatus_t   fState;            // State of file
  Int_t        fDebugLevel;       //

  static BrCalibrationManager* fInstance;

  ClassDef(BrCalibrationManager, 0) // Parameter Database Manager
}
;

#endif
// $Log: BrCalibrationManager.h,v $
// Revision 1.1  2001/10/08 10:40:32  cholm
// * Renamed BrParameterElement[Manager] to BrCalibration[Manager]
// * Impacts some modules, and maybe user code too.
// * Made the access class BrCalibrationsDb 'polymorphic'
// * All database table representations have class version > 0 (persistent)
//
// Revision 1.2  2001/09/12 15:12:08  cholm
// Removed List in favour of Print.  Some clean-up.
//
// Revision 1.1.1.1  2001/06/21 14:55:17  hagel
// Initial revision of brat2
//
// Revision 1.4  2001/06/05 18:39:36  cholm
// Removed BrDbInc.h an all references to it
//
// Revision 1.3  2000/06/03 18:12:49  videbaek
// Many update to the ParamemertElement and related classes for the calibration access.
//
// Revision 1.2  2000/05/17 10:43:13  cholm
// Test for reading Calibrations DB added
//
// Revision 1.1  2000/05/16 16:16:24  videbaek
// Added the database utility classes for dealing with calibrations.
// These are ParameterElement and ParamterElementManager. Each of these two
// classes has intrinsic utility classes.
//
//