EDProductGetterFinder.h

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#ifndef canvas_Persistency_Common_EDProductGetterFinder_h
#define canvas_Persistency_Common_EDProductGetterFinder_h

// The RefCoreStreamer uses the interface defined here to find the
// EDProductGetter corresponding to the current event and the
// ProductID. A pointer to the EDProductGetter is then written into
// the RefCore and will get used the first time the Ptr containing the
// RefCore is dereferenced.  This base class breaks the dependence of
// the RefCoreStreamer on the classes that derive from this class. In
// the full framework this will be a base class for the art::Principal
// and in gallery this will be a base class for the gallery::Event.

#include "canvas/Persistency/Provenance/ProductID.h"

namespace art {

  class EDProductGetter;
  class ProductID;

  class EDProductGetterFinder {
  public:
    virtual ~EDProductGetterFinder() = default;

    EDProductGetter const*
    getEDProductGetter(ProductID const pid) const
    {
      return getEDProductGetterImpl(pid);
    }

  private:
    virtual EDProductGetter const* getEDProductGetterImpl(ProductID) const = 0;
  };
}

#endif /* canvas_Persistency_Common_EDProductGetterFinder_h */

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