WillGetIfMatch.h

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#ifndef FWCore_Framework_WillGetIfMatch_h
#define FWCore_Framework_WillGetIfMatch_h
 
#include <functional>
#include "DataFormats/Provenance/interface/BranchDescription.h"
#include "FWCore/Framework/interface/EDConsumerBase.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Utilities/interface/EDGetToken.h"
 
namespace edm {
 
  template <typename T>
  class WillGetIfMatch {
  public:
    template <typename U>
    WillGetIfMatch(U const& match, EDConsumerBase* module) : match_(match), module_(module) {}
 
    EDGetTokenT<T> operator()(BranchDescription const& branchDescription) {
      if (match_(branchDescription)) {
        auto transition = branchDescription.branchType();
        edm::InputTag tag{
            branchDescription.moduleLabel(), branchDescription.productInstanceName(), branchDescription.processName()};
        if (transition == edm::InEvent) {
          return module_->template consumes<T>(tag);
        } else if (transition == edm::InLumi) {
          return module_->template consumes<T, edm::InLumi>(tag);
        } else if (transition == edm::InRun) {
          return module_->template consumes<T, edm::InRun>(tag);
        } else if (transition == edm::InProcess) {
          return module_->template consumes<T, edm::InProcess>(tag);
        }
      }
      return EDGetTokenT<T>{};
    }
 
  private:
    std::function<bool(BranchDescription const&)> match_;
    EDConsumerBase* module_;
  };
}  // namespace edm
#endif