GeoSwimmer.h

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// GeoSwimmer
//
// January 20, 2006  M.Ishitsuka First version for GeoSwimmer
//                   ref. SwimSwimmer.h
//
// $Id: GeoSwimmer.h,v 1.5 2008/03/17 17:51:30 ishi Exp $
//
// Swimming through a particle, forward or backward
//
// seun@huhepl.harvard.edu
#ifndef GEOSWIMMER_H
#define GEOSWIMMER_H

#include <cassert>
#include <TMath.h>
#include "Validity/VldContext.h"
#include "UgliGeometry/UgliGeomHandle.h"

class GeoSwimZCondition;
class GeoSwimParticle;
class GeoSwimApplication;

class SwimParticle;

//......................................................................

class GeoSwimmer
{
public:
  static GeoSwimmer* Instance(); 

  void SetUseGeoSwimmer(bool b) {fUseGeoSwimmer = b;}  
  bool GetUseGeoSwimmer() {if(fUseGeoSwimmer) return true; return false;}  

  void Initialize(const VldContext& vldc);  
  
  bool SwimForward(GeoSwimParticle& particle, double z);
  bool SwimBackward(GeoSwimParticle& particle, double z);

  bool Swim(GeoSwimParticle& particle, GeoSwimZCondition& zc, int dir);

  // To be compatible with Swimmer
  bool SwimForward(SwimParticle& particle, double z);
  bool SwimBackward(SwimParticle& particle, double z);

  virtual ~GeoSwimmer();

protected:
  GeoSwimmer();  

private:
  static GeoSwimmer *fgInstance;

  struct Cleaner {
    void ClassIsUsed() { }; // dummy method
    ~Cleaner() {
      if (GeoSwimmer::fgInstance!=0) {
        delete GeoSwimmer::fgInstance;
        GeoSwimmer::fgInstance = 0;
      }
    }
  };
  friend struct Cleaner;

  bool                  fUseGeoSwimmer;
  GeoSwimApplication*   fMCAppUser;
  std::string           fMCConfig;

  bool     fHallSizeSet;
  TVector3 fHallMin;
  TVector3 fHallMax;
};

inline GeoSwimmer* GeoSwimmer::Instance()
{
  static Cleaner cleaner;
  
  if (fgInstance == 0) {
    cleaner.ClassIsUsed();           // dummy call
    fgInstance = new GeoSwimmer();
  }
  return fgInstance;
}

#endif //GEOSWIMMER_H

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