NoDataException.h

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#ifndef FWCore_Framework_NoDataException_h
#define FWCore_Framework_NoDataException_h
// -*- C++ -*-
//
// Package:     Framework
// Module:      NoDataException
//
//
// Author:      Chris D Jones
// Created:     Tue Dec  7 09:10:34 EST 1999
//

// system include files
#include <string>

// user include files
#include "FWCore/Framework/interface/DataKey.h"
#include "FWCore/Framework/interface/EventSetupRecordKey.h"
#include "FWCore/Framework/interface/HCTypeTag.h"
#include "FWCore/Utilities/interface/Exception.h"

// forward declarations
namespace edm {
  namespace eventsetup {

    class NoDataExceptionBase : public cms::Exception {
    public:
      NoDataExceptionBase(const EventSetupRecordKey& iRecordKey,
                          const DataKey& iDataKey,
                          const char* category_name = "NoDataException");
      ~NoDataExceptionBase() noexcept override;
      const DataKey& dataKey() const;

    protected:
      static std::string providerButNoDataMessage(const EventSetupRecordKey& iKey);
      static std::string noProviderMessage();
      void constructMessage(const char* iClassName, const std::string& iExtraInfo);

    private:
      void beginDataTypeMessage(std::string&) const;
      void endDataTypeMessage(std::string&) const;

      // ---------- Constructors and destructor ----------------
      //NoDataExceptionBase(const NoDataExceptionBase&) ; //allow default
      //const NoDataExceptionBase& operator=(const NoDataExceptionBase&); // allow default

      // ---------- data members -------------------------------
      EventSetupRecordKey record_;
      DataKey dataKey_;
    };

    template <class T>
    class NoDataException : public NoDataExceptionBase {
    public:
      NoDataException(const EventSetupRecordKey& iRecordKey,
                      const DataKey& iDataKey,
                      const char* category_name = "NoDataException")
          : NoDataExceptionBase(iRecordKey, iDataKey, category_name) {
        constructMessage(heterocontainer::className<T>(), providerButNoDataMessage(iRecordKey));
      }

      NoDataException(const EventSetupRecordKey& iRecordKey,
                      const DataKey& iDataKey,
                      const char* category_name,
                      const std::string& iExtraInfo)
          : NoDataExceptionBase(iRecordKey, iDataKey, category_name) {
        constructMessage(heterocontainer::className<T>(), iExtraInfo);
      }
    };

  }  // namespace eventsetup
}  // namespace edm
#endif