FWGenericHandle.h

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#ifndef Fireworks_FWGenericHandle_h
#define Fireworks_FWGenericHandle_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     FWGenericHandle
//
//
// Original Author:  Chris Jones
//         Created:  Sat Jan  7 15:40:43 EST 2006
//
 
// system include files
#include <string>
 
// user include files
#include "FWCore/Reflection/interface/ObjectWithDict.h"
#include "FWCore/Common/interface/EventBase.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/ConvertHandle.h"
 
// forward declarations
namespace edm {
  struct FWGenericObject {};
 
  template <>
  class Handle<FWGenericObject> {
  public:
    Handle(std::string const& iName) : type_(edm::TypeWithDict::byName(iName)), prod_(), prov_(nullptr) {
      if (type_ == edm::TypeWithDict()) {
        Exception::throwThis(errors::NotFound,
                             "Handle<FWGenericObject> told to use uknown type '",
                             iName.c_str(),
                             "'.\n Please check spelling or that a module uses this type in the job.");
      }
    }
 
    Handle(edm::TypeWithDict const& iType) : type_(iType), prod_(), prov_(nullptr) {
      if (iType == edm::TypeWithDict()) {
        Exception::throwThis(errors::NotFound, "Handle<FWGenericObject> given an invalid edm::TypeWithDict");
      }
    }
 
    Handle(Handle<FWGenericObject> const& h)
        : type_(h.type_), prod_(h.prod_), prov_(h.prov_), whyFailed_(h.whyFailed_) {}
 
    Handle(edm::ObjectWithDict const& prod, Provenance const* prov, ProductID const& pid)
        : type_(prod.typeOf()), prod_(prod), prov_(prov) {
      assert(prod_);
      assert(prov_);
      // assert(prov_->productID() != ProductID());
    }
 
    //~Handle();
 
    void swap(Handle<FWGenericObject>& other) {
      // use unqualified swap for user defined classes
      using std::swap;
      swap(type_, other.type_);
      std::swap(prod_, other.prod_);
      swap(prov_, other.prov_);
      swap(whyFailed_, other.whyFailed_);
    }
 
    Handle<FWGenericObject>& operator=(Handle<FWGenericObject> const& rhs) {
      Handle<FWGenericObject> temp(rhs);
      this->swap(temp);
      return *this;
    }
 
    bool isValid() const { return prod_ && nullptr != prov_; }
 
    bool failedToGet() const { return nullptr != whyFailed_.get(); }
    edm::ObjectWithDict const* product() const {
      if (this->failedToGet()) {
        whyFailed_->raise();
      }
      return &prod_;
    }
    edm::ObjectWithDict const* operator->() const { return this->product(); }
    edm::ObjectWithDict const& operator*() const { return *(this->product()); }
 
    edm::TypeWithDict const& type() const { return type_; }
    Provenance const* provenance() const { return prov_; }
 
    ProductID id() const { return prov_->productID(); }
 
    void clear() {
      prov_ = nullptr;
      whyFailed_.reset();
    }
 
    void setWhyFailed(std::shared_ptr<cms::Exception> const& iWhyFailed) { whyFailed_ = iWhyFailed; }
 
  private:
    edm::TypeWithDict type_;
    edm::ObjectWithDict prod_;
    Provenance const* prov_;
    std::shared_ptr<cms::Exception> whyFailed_;
  };
 
  typedef Handle<FWGenericObject> FWGenericHandle;
 
  void convert_handle(BasicHandle const& orig, Handle<FWGenericObject>& result);
 
  template <>
  bool edm::EventBase::getByLabel(edm::InputTag const& tag, Handle<FWGenericObject>& result) const;
 
}  // namespace edm
#endif