StepHandler.h

// -*- C++ -*-
//
// StepHandler.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_StepHandler_H
#define ThePEG_StepHandler_H
// This is the declaration of the StepHandler class.

#include "ThePEG/Config/ThePEG.h"
#include "ThePEG/Utilities/Exception.fh"
#include "ThePEG/Handlers/HandlerBase.h"
#include <stdexcept>

namespace ThePEG {

class StepHandler: public HandlerBase {

public:

  virtual ~StepHandler();

public:

  virtual void handle(EventHandler & eh, const tPVector & tagged,
                      const Hint & hint) = 0;

  tEHPtr eventHandler() const { return theEventHandler; }

  void eventHandler(tEHPtr);

  tStepPtr newStep() {
    if ( !theNewStep ) createNewStep();
    return theNewStep;
  }

  tStepPtr currentStep() {
    if ( theNewStep ) return theNewStep;
    return theCurrentStep;
  }

public:

  static void Init();

protected:

  void createNewStep();

private:

  tEHPtr theEventHandler;

  tStepPtr theNewStep;

  tStepPtr theCurrentStep;

private:

  static AbstractNoPIOClassDescription<StepHandler> initStepHandler;

  StepHandler & operator=(const StepHandler &);

};

template <>
struct BaseClassTrait<StepHandler,1>: public ClassTraitsType {
  typedef HandlerBase NthBase;
};

template <>
struct ClassTraits<StepHandler>: public ClassTraitsBase<StepHandler> {
  static string className() { return "ThePEG::StepHandler"; }
};

}

#endif /* ThePEG_StepHandler_H */

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