ESRecordsToProxyIndices.h

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#ifndef FWCore_Framework_ESRecordsToProxyIndices_h
#define FWCore_Framework_ESRecordsToProxyIndices_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     ESRecordsToProxyIndices
//
//
// Author:      Chris Jones
// Created:     Tues Feb 12 14:31:03 EST 2019
//

// system include files
#include <limits>

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

#include <vector>
// forward declarations
namespace edm::eventsetup {
  struct ComponentDescription;

  class ESRecordsToProxyIndices {
  public:
    ESRecordsToProxyIndices(std::vector<EventSetupRecordKey> iRecords);

    // ---------- const member functions ---------------------
    ESProxyIndex indexInRecord(EventSetupRecordKey const& iRK, DataKey const& iDK) const noexcept;

    ComponentDescription const* component(EventSetupRecordKey const& iRK, DataKey const& iDK) const noexcept;

    static constexpr ESProxyIndex missingProxyIndex() noexcept { return ESProxyIndex{std::numeric_limits<int>::max()}; }
    static constexpr ESRecordIndex missingRecordIndex() noexcept {
      return ESRecordIndex{std::numeric_limits<int>::max()};
    }

    ESRecordIndex recordIndexFor(EventSetupRecordKey const& iRK) const noexcept;
    // ---------- member functions ---------------------------
    unsigned int dataKeysInRecord(unsigned int iRecordIndex,
                                  EventSetupRecordKey const& iRecord,
                                  std::vector<DataKey> const& iDataKeys,
                                  std::vector<ComponentDescription const*> const& iComponents);

  private:
    // ---------- member data --------------------------------
    std::vector<EventSetupRecordKey> recordKeys_;
    //for each item in recordKeys_ this holds the index to the first
    // DataKey for that item in dataKeys_
    // recordOffset_ is 1 size larger than recordKeys_ with the
    // last entry being dataKeys_.size()
    std::vector<unsigned int> recordOffsets_;
    std::vector<DataKey> dataKeys_;
    std::vector<ComponentDescription const*> components_;
  };

}  // namespace edm::eventsetup
#endif