//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
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// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// G4VStateDependent
//
// Class description:
//
// Abstract base class of all classes which need to be notified when
// the state of Geant4 changes. The concrete class object derived from
// this base class will be automatically registered to G4StateManager
// and the virtual method Notify() will be invoked when the state changes.

// Authors: G.Cosmo, M.Asai - November 1996
// --------------------------------------------------------------------
#ifndef G4VStateDependent_hh
#define G4VStateDependent_hh 1

#include "G4ApplicationState.hh"
#include "G4Types.hh"

class G4Event;
class G4Run;

class G4VStateDependent
{
 public:
  explicit G4VStateDependent(G4bool bottom = false);
  virtual ~G4VStateDependent();
  G4bool operator==(const G4VStateDependent& right) const;
  G4bool operator!=(const G4VStateDependent& right) const;

  virtual G4bool Notify(G4ApplicationState requestedState) = 0;
  // Pure virtual method which will be invoked by G4StateManager.
  // In case a state change must not be allowed by some reason of the
  // concrete class, false should be returned. But this scheme use is
  // NOT recommended. All commands which are state sensitive MUST assign
  // available state(s).

  virtual void NotifyDeletion(const G4Event*) {}
  virtual void NotifyDeletion(const G4Run*) {}

 private:
  G4VStateDependent(const G4VStateDependent& right);
  G4VStateDependent& operator=(const G4VStateDependent& right);
};

#endif