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 noProxyMessage();
  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);
  }

};

   }
}
#endif