ComponentMaker.h

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#ifndef Framework_ComponentMaker_h
#define Framework_ComponentMaker_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     ComponentMaker
// 
//
// Author:      Chris Jones
// Created:     Wed May 25 16:56:05 EDT 2005
//

// system include files
#include <string>
#include "boost/shared_ptr.hpp"

// user include files
#include "FWCore/Framework/interface/ComponentDescription.h"
#include "FWCore/Framework/interface/DataProxyProvider.h"
#include "FWCore/Framework/interface/EventSetupRecordIntervalFinder.h"

// forward declarations

namespace edm {
   namespace eventsetup {
      class EventSetupProvider;
      class EventSetupsController;
      class DataProxyProvider;
    
      class ComponentMakerBaseHelper
      {
      public:
        virtual ~ComponentMakerBaseHelper() {}
      protected:
        void logInfoWhenSharing(ParameterSet const& iConfiguration) const;
        ComponentDescription createComponentDescription(ParameterSet const& iConfiguration) const;
      };
 
      template <class T>
      class ComponentMakerBase : public ComponentMakerBaseHelper {
      public:
         typedef typename T::base_type base_type;
         virtual boost::shared_ptr<base_type> addTo(EventSetupsController& esController,
                                                    EventSetupProvider& iProvider,
                                                    ParameterSet const& iConfiguration) const = 0;
      };
      
   template <class T, class TComponent>
   class ComponentMaker : public ComponentMakerBase<T>
   {

   public:
   ComponentMaker() {}
      //virtual ~ComponentMaker();
   typedef typename T::base_type base_type;

      // ---------- const member functions ---------------------
   virtual boost::shared_ptr<base_type> addTo(EventSetupsController& esController,
                                              EventSetupProvider& iProvider,
                                              ParameterSet const& iConfiguration) const;
   
      // ---------- static member functions --------------------

      // ---------- member functions ---------------------------
   private:
      ComponentMaker(const ComponentMaker&); // stop default

      const ComponentMaker& operator=(const ComponentMaker&); // stop default

      void setDescription(DataProxyProvider* iProv, const ComponentDescription& iDesc) const {
        iProv->setDescription(iDesc);
      }
      void setDescriptionForFinder(EventSetupRecordIntervalFinder* iFinder, const ComponentDescription& iDesc) const {
        iFinder->setDescriptionForFinder(iDesc);
      }
      void setPostConstruction(DataProxyProvider* iProv, const edm::ParameterSet& iPSet) const {
        //The 'appendToDataLabel' parameter was added very late in the development cycle and since
        // the ParameterSet is not sent to the base class we must set the value after construction
        iProv->setAppendToDataLabel(iPSet);
      }
      void setDescription(void*, const ComponentDescription&) const {
      }
      void setDescriptionForFinder(void*, const ComponentDescription&) const {
      }
      void setPostConstruction(void*, const edm::ParameterSet&) const {
      }
      // ---------- member data --------------------------------

};

template< class T, class TComponent>
boost::shared_ptr<typename ComponentMaker<T,TComponent>::base_type>
ComponentMaker<T,TComponent>::addTo(EventSetupsController& esController,
                                    EventSetupProvider& iProvider,
                                    ParameterSet const& iConfiguration) const
{
   boost::shared_ptr<typename T::base_type> const* alreadyMadeComponent = T::getAlreadyMadeComponent(esController, iConfiguration);

   if (alreadyMadeComponent) {
      this->logInfoWhenSharing(iConfiguration);
      boost::shared_ptr<TComponent> component(boost::static_pointer_cast<TComponent, typename T::base_type>(*alreadyMadeComponent));
      T::addTo(iProvider, component);
      return component;
   }

   boost::shared_ptr<TComponent> component(new TComponent(iConfiguration));
   ComponentDescription description =
       this->createComponentDescription(iConfiguration);

   this->setDescription(component.get(),description);
   this->setDescriptionForFinder(component.get(),description);
   this->setPostConstruction(component.get(),iConfiguration);
   T::addTo(iProvider, component);
   T::putComponent(esController, iConfiguration, component);

   return component;
}
   }
}
#endif