// -*- mode: c++ -*- 
//
// $Id: BrParameterDbManager.h,v 1.1.1.1 2001/06/21 14:55:17 hagel Exp $
//
#ifndef BRAT_BrParameterDbManager
#define BRAT_BrParameterDbManager
#ifndef ROOT_TObject
#include "TObject.h"
#endif
#ifndef ROOT_TObjArray
#include "TObjArray.h"
#endif

// BRAHMS Classes
class BrDbObject;

class BrParameterDbManager : public TObject 
{
private:
  enum DbStatus_t {
    INIT, 
    OPEN, 
    DEFAULT_PARAMETER_SET
  };
public:
  static BrParameterDbManager* 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:
  BrParameterDbManager();
public:
  ~BrParameterDbManager();
public:
  void        SetDbParameterFileName(Char_t* filename);
  void        SetDebugLevel(Int_t level){fDebugLevel=level;} 
  Bool_t      Open(Char_t *filename);
  void        SetOptionDefaultParameters() {
    fState = DEFAULT_PARAMETER_SET;} 
  TObject*    GetDetectorParameters(const Char_t* classname,
				    const Char_t* detector); 
  void        List();
  
private:
  BrDbObject* GetDbObject(const Char_t* classname,
			  const Char_t* detector); 

  TObjArray* fObjectlist;       // List 
  DbStatus_t fState;            // State of file
  Char_t fFileName[132];        // Filename for parameters (fileopen)
  Int_t    fDebugLevel;         // Debug Level 
  static BrParameterDbManager* fInstance;

  ClassDef(BrParameterDbManager,0) // BRAHMS Parameter Database Manager object
};

#endif
//
// $Log: BrParameterDbManager.h,v $
// Revision 1.1.1.1  2001/06/21 14:55:17  hagel
// Initial revision of brat2
//
// Revision 1.6  2001/06/05 18:39:29  cholm
// Removed BrDbInc.h an all references to it
//
// Revision 1.5  2000/05/10 15:56:04  nbi
// Added the classes BrRunsDb, BrGeometriesDb, changed some code, bug
// corrections , and so on. It's almost there ;-)
//
// Revision 1.4  1999/03/07 00:00:43  hagel
// 1. Implemented  BrFSTrackingModule.  Started with BrMRSTrackingModule and made
//    appropriate changes to handle the forward spectrometer.  It uses the new
//    track classes as well as extensively using geometry classes.  It also uses
//    new methods and functionality as described below.
// 2. Changed BrMagnetVolume
//    a.  Added method SwimBack(BrLine3D &,Double_t momentum): takes a
//        track at the exit of  magnet and given the momentum, calculates
//        where the track would come into the front of the magnet.
//    b.  Added method GlobalToLocal(BrLine3D &): does a combination of
//        GlobalToLocal(BrVector3D &,BrVector3D&,0) and
//        GlobalToLocal(BrVector3D &,BrVector3D&,1)
//    c.  Added method LocalToGlobal(BrLine3D &): does a combination of
//        LocalToGlobal(BrVector3D &,BrVector3D&,0) and
//        LocalToGlobal(BrVector3D &,BrVector3D&,1)
//    d.  Changed BrDetectorVolume: same additions of methods GlobalToLocal
//        and LocalToGlobal as in BrMagnetVolume
// 2.  Added a parameter base class BrDetectorParamsBase: helps when reading
//     in database files.  Declared ASCII reading routines to be virtual.
//     Has main ReadASCIIFile which decodes the ASCII parameter files, then
//     calls the detector specific methods SetASCIIParameter
// 3.  Implemented SetASCIIParameter in BrDetectorParamsDC, BrDetectorParamsTPC,
//     BrDetectorParamsTof, BrDetectorParamsBB
// 4.  Implemented BrParameterDbManager.  It currently works similarly to
//     BrGeometryDbManager and creates the BrDetectorParamsXXX objects when
//     called.  These objects then read in ASCII parameter files with a currently
//     "well defined" format using the above implemented routines using a constructor:
//     BrDetectorParamsXXX(Char_t *name, Char_t *title,Char_t *ASCIIFileName);
// 5.  If no parameter file is specified, it executes the constructor we
//     have been using so far, namely BrDetectorParamsXXX(Char_t *name,Char_t *title).
//     These constructors generate default parameters and are semi-intelligent
//     which means they generate approximately appropriate parameters depending
//     upon which detector they are.  I should say that the parameters were
//     deemed appropriate at the time of writing the SetDefaultParams routine.
//     a. It is used in the same way as BrGeometryDbManager, that is:
//        BrParameterDbManager *gParamDb = BrParameterDbManager::Instance();
//        gParamDb->SetDbParameterFileName("DetectorParameters.txt");
// 6.  Added a new directory, params, in BRAT.  This directory has the file
//     DetectorParameters.txt in it.  If the BrParameterDbManager is started
//     and the DetectorParameter.txt file is specified, it will look in the
//     $BRATSYS/params directory if it cannot find the file in the directory
//     that the user has set default to.
// 7.  Implemented BrParameterDbManager in DC digitize and tracking code.  The
//     SetDetectorParams methods have been moved to private and can no longer be
//     used from the macro or program.
// 8.  Implemented BrParameterDbManager in TPC digitize and tracking code.
// 9.  Implemented BrParameterDbManager in Tof Calibrate and GeneratePid code.
// 10  Changed the GetEntries() in BrDataTable to use the GetLast()+1 method in
//     TObjArray.  This should be much faster, but has the caveat that it assumes
//     that all slots in TObjArray are full.  That seems to me to be the case
//     in how we use TObjArray at least in BrDataTable, but if problems arise due
//     to this change, it can always be easily changed back.  It has been used a
//     fair amount before checking in and no problems were found.
//
//  Modified Files:
//  	base/inc/BrBase_LinkDef.h base/inc/BrDataTable.h
//  	base/inc/BrDetectorVolume.h base/inc/BrMagnetVolume.h
//  	base/inc/LinkDefBratBaseINC.h base/src/BrDataTable.cxx
//  	base/src/BrDetectorVolume.cxx base/src/BrEventNode.cxx
//  	base/src/BrMagnetVolume.cxx base/src/BrTableManager.cxx
//  	base/src/Makefile bb/inc/BrDetectorParamsBB.h
//  	bb/src/BrDetectorParamsBB.cxx db/inc/BrParameterDbManager.h
//  	db/src/BrParameterDbManager.cxx dc/inc/BrDetectorParamsDC.h
//  	dc/src/BrDetectorDC.cxx dc/src/BrDetectorParamsDC.cxx
//  	dc/src/BrDigitizeDC.cxx dc/src/BrLocalTrackDC.cxx
//  	geometry/inc/BrPlane3D.h geometry/src/BrPlane3D.cxx
//  	params/DetectorParameters.txt tof/inc/BrDetectorParamsTof.h
//  	tof/src/BrDetectorParamsTof.cxx tof/src/BrGeneratePid.cxx
//  	tpc/inc/BrDetectorParamsTPC.h tpc/src/BrDetectorParamsTPC.cxx
//  	tpc/src/BrDetectorTPC.cxx tpc/src/BrDigitizeTPC.cxx
//  	tpc/src/BrLocalTrackTPC.cxx track/inc/BrDetectorTrack.h
//  	track/inc/BrFSTrackingModule.h
//  	track/inc/BrSpectrometerTracks.h track/src/BrDetectorTrack.cxx
//  	track/src/BrFSTrackingModule.cxx
//  	track/src/BrSpectrometerTracks.cxx
//
// Revision 1.3  1999/02/24 15:21:22  hagel
// Enforce const in arguments
//
// Revision 1.2  1999/02/17 21:26:01  hagel
// Removed cyclic dependencies from BrParameterDbManager.  Now all references are
// indirect using ROOT infrastructure to get at the classes.  If this works, it is
// general and should be considered for the other DbManager classes.  Or perhaps
// in a base DbManager class.
//
// Revision 1.1  1999/02/04 20:43:31  hagel
// Initial revision
// See cvs log notes in BrParameterDbManager.cxx for more information
//
//
//