EDProductGetter.h

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#ifndef DataFormats_Common_EDProductGetter_h
#define DataFormats_Common_EDProductGetter_h
// -*- C++ -*-
//
// Class  :     EDProductGetter
//
//
// Original Author:  Chris Jones
//         Created:  Tue Nov  1 15:06:31 EST 2005
//

// user include files
#include "DataFormats/Common/interface/WrapperHolder.h"
#include "DataFormats/Provenance/interface/ProductID.h"

// system include files
#include "boost/utility.hpp"

// forward declarations

namespace edm {
   class EDProductGetter : private boost::noncopyable {

   public:

     EDProductGetter();
     virtual ~EDProductGetter();

     // ---------- const member functions ---------------------
     virtual WrapperHolder getIt(ProductID const&) const = 0;

     unsigned int transitionIndex() const {
       return transitionIndex_();
     }

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

     static EDProductGetter const* switchProductGetter(EDProductGetter const*);
     static void assignEDProductGetter(EDProductGetter const*&);

private:
    virtual unsigned int transitionIndex_() const = 0;

     // ---------- member data --------------------------------

   };

   EDProductGetter const*
   mustBeNonZero(EDProductGetter const* prodGetter, std::string refType, ProductID const& productID);
}
#endif