PluginFactory.h

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#ifndef FWCore_PluginManager_PluginFactory_h
#define FWCore_PluginManager_PluginFactory_h
// -*- C++ -*-
//
// Package:     PluginManager
// Class  :     PluginFactory
// 
//
// Original Author:  Chris Jones
//         Created:  Thu Apr  5 12:10:23 EDT 2007
//

// system include files
#include <map>
#include <vector>

// user include files
#include "FWCore/PluginManager/interface/PluginFactoryBase.h"
#include "FWCore/PluginManager/interface/PluginManager.h"
// forward declarations

namespace edmplugin {
  template< class T> class PluginFactory;
  class DummyFriend;
  
template<class R>
class PluginFactory<R * (void)> : public PluginFactoryBase
{
      friend class DummyFriend;
   public:
      struct PMakerBase {
        virtual R* create(void) const = 0;
        virtual ~PMakerBase() {}
      };
      template<class TPlug>
      struct PMaker : public PMakerBase {
        PMaker(const std::string& iName) {
          PluginFactory<R*(void)>::get()->registerPMaker(this,iName);
        }
        virtual R* create() const {
          return new TPlug();
        }
      };

      // ---------- const member functions ---------------------
      virtual const std::string& category() const ;
      
      R* create(const std::string& iName) const {
        return reinterpret_cast<PMakerBase*>(PluginFactoryBase::findPMaker(iName)->second.front().first)->create();
      }

      R* tryToCreate(const std::string& iName) const {
        typename Plugins::const_iterator itFound = PluginFactoryBase::tryToFindPMaker(iName);
        if(itFound ==m_plugins.end() ) {
          return 0;
        }
        return reinterpret_cast<PMakerBase*>(itFound->second.front().first)->create();
      }
      // ---------- static member functions --------------------

      static PluginFactory<R*(void)>* get();
      // ---------- member functions ---------------------------
      void registerPMaker(PMakerBase* iPMaker, const std::string& iName) {
        PluginFactoryBase::registerPMaker(iPMaker, iName);
      }

   private:
      PluginFactory() {
        finishedConstruction();
      }
      PluginFactory(const PluginFactory&); // stop default

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

};

template<class R, class Arg>
class PluginFactory<R * (Arg)> : public PluginFactoryBase
{
  friend class DummyFriend;
public:
  struct PMakerBase {
    virtual R* create(Arg) const = 0;
    virtual ~PMakerBase() {}
  };
  template<class TPlug>
    struct PMaker : public PMakerBase {
      PMaker(const std::string& iName) {
        PluginFactory<R*(Arg)>::get()->registerPMaker(this,iName);
      }
      virtual R* create(Arg iArg) const {
        return new TPlug(iArg);
      }
    };
  
  // ---------- const member functions ---------------------
  virtual const std::string& category() const ;
  
  R* create(const std::string& iName, Arg iArg) const {
    return reinterpret_cast<PMakerBase *>(PluginFactoryBase::findPMaker(iName)->second.front().first)->create(iArg);
  }
  R* tryToCreate(const std::string& iName, Arg iArg) const {
    typename Plugins::const_iterator itFound = PluginFactoryBase::tryToFindPMaker(iName);
    if(itFound ==m_plugins.end() ) {
      return 0;
    }
    return reinterpret_cast<PMakerBase *>(itFound->second.front().first)->create(iArg);
  }
  // ---------- static member functions --------------------
  
  static PluginFactory<R*(Arg)>* get();
  // ---------- member functions ---------------------------
  void registerPMaker(PMakerBase* iPMaker, const std::string& iName) {
    PluginFactoryBase::registerPMaker(iPMaker, iName);
  }
  
private:
    PluginFactory() {
      finishedConstruction();
    }
  PluginFactory(const PluginFactory&); // stop default
  
  const PluginFactory& operator=(const PluginFactory&); // stop default
  
};

template<class R, class Arg1, class Arg2>
class PluginFactory<R * (Arg1, Arg2)> : public PluginFactoryBase
{
  friend class DummyFriend;
public:
  struct PMakerBase {
    virtual R* create(Arg1, Arg2) const = 0;
    virtual ~PMakerBase() {}
  };
  template<class TPlug>
    struct PMaker : public PMakerBase {
      PMaker(const std::string& iName) {
        PluginFactory<R*(Arg1,Arg2)>::get()->registerPMaker(this,iName);
      }
      virtual R* create(Arg1 iArg1, Arg2 iArg2) const {
        return new TPlug(iArg1, iArg2);
      }
    };
  
  // ---------- const member functions ---------------------
  virtual const std::string& category() const ;
  
  R* create(const std::string& iName, Arg1 iArg1, Arg2 iArg2) const {
    return reinterpret_cast<PMakerBase *>(PluginFactoryBase::findPMaker(iName)->second.front().first)->create(iArg1, iArg2);
  }
  R* tryToCreate(const std::string& iName, Arg1 iArg1, Arg2 iArg2) const {
    typename Plugins::const_iterator itFound = PluginFactoryBase::tryToFindPMaker(iName);
    if(itFound ==m_plugins.end() ) {
      return 0;
    }
    return reinterpret_cast<PMakerBase *>(itFound->second.front().first)->create(iArg1,iArg2);
  }

  // ---------- static member functions --------------------
  
  static PluginFactory<R*(Arg1,Arg2)>* get();
  // ---------- member functions ---------------------------
  void registerPMaker(PMakerBase* iPMaker, const std::string& iName) {
    PluginFactoryBase::registerPMaker(iPMaker, iName);
  }
  
private:
    PluginFactory() {
      finishedConstruction();
    }
  PluginFactory(const PluginFactory&); // stop default
  
  const PluginFactory& operator=(const PluginFactory&); // stop default
  
};

}
#define CONCATENATE_HIDDEN(a,b) a ## b 
#define CONCATENATE(a,b) CONCATENATE_HIDDEN(a,b)
#define EDM_REGISTER_PLUGINFACTORY(_factory_,_category_) \
namespace edmplugin {\
  template<> _factory_* _factory_::get() { static _factory_ s_instance; return &s_instance;}\
  template<> const std::string& _factory_::category() const { static std::string s_cat(_category_);  return s_cat;}\
} enum {CONCATENATE(dummy_edm_register_pluginfactory_, __LINE__)}

#endif

#define EDM_PLUGIN_SYM(x,y) EDM_PLUGIN_SYM2(x,y)
#define EDM_PLUGIN_SYM2(x,y) x ## y

#define DEFINE_EDM_PLUGIN(factory,type,name) \
static factory::PMaker<type> EDM_PLUGIN_SYM(s_maker , __LINE__ ) (name)