Reconstruction/MdcPatRec/TrkBase/include/TrkBase/TrkContext.h

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//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: TrkContext.h,v 1.1.1.1 2005/04/21 06:01:42 zhangy Exp $
//
// Description:
//     Holds information about the "environment" in which a track is created --
// BField, track id manager.  One of these objects must be passed
// to the track when it is created.  The idea is to decouple the tracks
// from the sources of this information.  (See TrkFitter/TrkContextEv for
// semi-automatic creation of an object of this class.)
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author(s): Steve Schaffner
//
//------------------------------------------------------------------------
 
#ifndef TRKCONTEXT_HH
#define TRKCONTEXT_HH
 
namespace MdcPatRec {
  class BField;
}
class TrkIdManager;
class TrkId;
 
// Class interface //
class TrkContext {
 
public:
  TrkContext( const MdcPatRec::BField* );
  TrkContext( const TrkContext& );
  virtual ~TrkContext();
  TrkContext& operator=( const TrkContext& );
 
  const MdcPatRec::BField* bField() const { return _bf; }
  virtual TrkId            getId() const = 0;
 
  void setBField( const MdcPatRec::BField* bf );
  bool operator==( const TrkContext& ) const;
 
protected:
private:
  const MdcPatRec::BField* _bf;
};
 
#endif