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#ifndef DataFormats_Common_EDProductGetter_h
#define DataFormats_Common_EDProductGetter_h
// -*- C++ -*-
//
// Package:     EDProduct
// Class  :     EDProductGetter
// 
//
// Original Author:  Chris Jones
//         Created:  Tue Nov  1 15:06:31 EST 2005
// $Id: EDProductGetter.h,v 1.10 2011/02/24 23:37:53 chrjones Exp $
//

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

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

// forward declarations

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

   public:
   
      EDProductGetter();
      virtual ~EDProductGetter();

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

      ProductID oldToNewProductID(ProductID const& oldProductID) const {
        if (oldProductID.oldID() == 0) return oldProductID;
        return oldToNewProductID_(oldProductID);
      }
     
     static EDProductGetter const* switchProductGetter(EDProductGetter const*);
     static void assignEDProductGetter(EDProductGetter const* &);

private:
      virtual ProductID oldToNewProductID_(ProductID const& oldProductID) const;
      // ---------- member data --------------------------------
      
   };

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

#endif