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// $Id$
//
// 080718 Add ClearHistories() method by T. Koi
//
#ifndef G4VNeutronHPEnergyAngular_h
#define G4VNeutronHPEnergyAngular_h 1

#include <fstream>

#include "globals.hh"
#include "G4ios.hh"
#include "G4ReactionProduct.hh"

class G4VNeutronHPEnergyAngular
{
  public:
  
  G4VNeutronHPEnergyAngular()
  {
    theTarget = 0;
    theNeutron = 0;
    theQValue=0;
  }
  virtual ~G4VNeutronHPEnergyAngular(){}
  
  public:
  
  virtual void Init(std::ifstream & aDataFile) = 0;
  virtual G4ReactionProduct * Sample(G4double anEnergy, 
                                     G4double massCode, 
                                     G4double mass) = 0;
  virtual G4double MeanEnergyOfThisInteraction() = 0; // returns value cashed in sample
  
  void SetNeutron(G4ReactionProduct * aNeutron) 
  { 
    theNeutron = aNeutron; 
    if(theTarget!=0) theCMS = *theNeutron+*theTarget;
  }
  
  void SetTarget(G4ReactionProduct * aTarget)
  { 
    theTarget = aTarget; 
  }
  
  G4ReactionProduct * GetTarget() { return theTarget; }
  
  G4ReactionProduct * GetNeutron() { return theNeutron; }
  
  G4ReactionProduct * GetCMS() { return &theCMS; }

  inline void SetQValue(G4double aValue) { theQValue = aValue; }
  
  protected:
  
  inline G4double GetQValue() { return theQValue; }
  
  private:
  
  G4double theQValue;
    
  G4ReactionProduct * theTarget;
  G4ReactionProduct * theNeutron;
  G4ReactionProduct theCMS;
    
   public:
      virtual void ClearHistories(){;};
};
#endif