Fireworks/Core/src/FWGenericHandle.cc - master - githubmirror/cmssw

Fireworks/Core/src/FWGenericHandle.cc
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20 май 2019, 13:07
20 май 2019, 13:076684288
// -*- C++ -*-
//
// Package:     Framework
// Class  :     FWGenericHandle
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:  Chris Jones
//         Created:  Thu Mar 30 15:48:37 EST 2006
//

// system include files
#include <iostream>

// user include files
#include "Fireworks/Core/src/FWGenericHandle.h"

namespace edm {
  void convert_handle(BasicHandle const& orig, Handle<FWGenericObject>& result) {
    if (orig.failedToGet()) {
      result.setWhyFailed(orig.whyFailed());
      return;
    }

    WrapperBase const* originalWrap = orig.wrapper();
    if (originalWrap == nullptr) {
      throw edm::Exception(edm::errors::InvalidReference, "NullPointer")
          << "edm::BasicHandle has null pointer to Wrapper";
    }

    edm::ObjectWithDict wrap(edm::TypeWithDict(originalWrap->wrappedTypeInfo()),
                             const_cast<void*>(static_cast<void const*>(originalWrap)));
    assert(bool(wrap));

    edm::ObjectWithDict product(wrap.get("obj"));

    if (!product) {
      throw edm::Exception(edm::errors::LogicError) << "FWGenericObject could not find 'obj' member";
    }
    if (product.typeOf() != result.type()) {
      std::cerr << "FWGenericObject asked for " << result.type().name() << " but was given a "
                << product.typeOf().name();
      throw edm::Exception(edm::errors::LogicError)
          << "FWGenericObject asked for " << result.type().name() << " but was given a " << product.typeOf().name();
    }

    Handle<FWGenericObject> h(product, orig.provenance(), orig.id());
    h.swap(result);
  }

  ///Specialize the getByLabel method to work with a Handle<FWGenericObject>
  template <>
  bool edm::EventBase::getByLabel<FWGenericObject>(edm::InputTag const& tag, Handle<FWGenericObject>& result) const {
    std::string dataTypeName = result.type().name();
    if (dataTypeName[dataTypeName.size() - 1] == '>')
      dataTypeName += " ";
    std::string wrapperName = "edm::Wrapper<" + dataTypeName + ">";

    edm::TypeWithDict wrapperType(edm::TypeWithDict::byName(wrapperName));

    BasicHandle bh = this->getByLabelImpl(wrapperType.typeInfo(), result.type().typeInfo(), tag);
    convert_handle(bh, result);  // throws on conversion error
    if (bh.failedToGet())
      return false;
    return true;
  }

}  // namespace edm