ProcessingController.h

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#ifndef FWCore_Framework_ProcessingController_h
#define FWCore_Framework_ProcessingController_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     ProcessingController
//
//
// Original Author:  Chris Jones
//         Created:  Fri Aug  6 16:06:01 CDT 2010
//

// system include files

// user include files
#include "DataFormats/Provenance/interface/EventID.h"

// forward declarations
namespace edm {

  class ProcessingController {
  public:
    enum ForwardState {
      kEventsAheadInFile,
      kNextFileExists,  // but no events ahead in this file
      kAtLastEvent,
      kUnknownForward  // returned by a source which is not random accessible
    };

    enum ReverseState {
      kEventsBackwardsInFile,
      kPreviousFileExists,  // but no events backwards in this file
      kAtFirstEvent,
      kUnknownReverse  // returned by a source which is not random accessible
    };

    ProcessingController(ForwardState forwardState, ReverseState reverseState, bool iCanRandomAccess);
    ProcessingController(const ProcessingController&) = delete;                   // stop default
    const ProcessingController& operator=(const ProcessingController&) = delete;  // stop default

    // ---------- const member functions ---------------------

    ForwardState forwardState() const;
    ReverseState reverseState() const;

    bool canRandomAccess() const;

    enum Transition { kToNextEvent, kToPreviousEvent, kToSpecifiedEvent };

    Transition requestedTransition() const;

    edm::EventID specifiedEventTransition() const;

    bool lastOperationSucceeded() const;

    // ---------- static member functions --------------------

    // ---------- member functions ---------------------------

    void setTransitionToNextEvent();

    void setTransitionToPreviousEvent();

    void setTransitionToEvent(edm::EventID const& iID);

    void setLastOperationSucceeded(bool value);

  private:
    // ---------- member data --------------------------------
    ForwardState forwardState_;
    ReverseState reverseState_;
    Transition transition_;
    EventID specifiedEvent_;
    bool canRandomAccess_;
    bool lastOperationSucceeded_;
  };
}  // namespace edm
#endif