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EDProductGetter.h

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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 1.6 2008/05/29 21:13:15 wmtan Exp $
//

// system include files

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

// forward declarations

namespace edm {
   class EDProduct;
   class EDProductGetter {

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

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

      class Operate {
       public:
         Operate(EDProductGetter const* iGet) : previous_(EDProductGetter::set(iGet)) {
         }
         ~Operate() {
            EDProductGetter::set(previous_);
         }
       private:
         EDProductGetter const* previous_;
      };
      
      friend class Operate;
private:
      EDProductGetter(EDProductGetter const&); // stop default

      const EDProductGetter& operator=(EDProductGetter const&); // stop default

      static EDProductGetter const* set(EDProductGetter const*);
      // ---------- member data --------------------------------
      
   };

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

#endif

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