PluginAlias.hpp

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#ifndef USERUTILS_EDMUTILS_PLUGINALIAS_HPP
#define USERUTILS_EDMUTILS_PLUGINALIAS_HPP
 
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/one/EDAnalyzer.h"
#include "FWCore/Framework/interface/one/EDFilter.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
 
#include "TFile.h"
#include "TObject.h"
 
#include <string>
 
namespace usr
{
 
template<typename EDMPLUGIN>
class PluginAlias : public EDMPLUGIN
{
public:
  PluginAlias( const edm::ParameterSet& config ) :
    _config( config ){}
  virtual ~PluginAlias(){}
 
protected:
  template<typename TYPE>
  inline edm::EDGetToken
  GetToken( const std::string& configtag )
  {
    return edm::EDConsumerBase::consumes<TYPE>(
      _config.getParameter<edm::InputTag>( configtag ) );
  }
 
 
  template<typename TYPE>
  inline edm::EDGetToken
  GetRunToken( const std::string& configtag )
  {
    return edm::EDConsumerBase::consumes<TYPE, edm::InRun>(
      _config.getParameter<edm::InputTag>( configtag ) );
  }
 
 
  template<typename TYPE>
  inline edm::Handle<TYPE>
  MakeHandle( const edm::Event& event, const edm::EDGetToken tok )
  {
    edm::Handle<TYPE> handle;
    event.getByToken( tok, handle );
    assert( handle.isValid() );
    return handle;
  }
 
 
  inline TObject*GetFileObj( const std::string& filetag,
                             const std::string  objtag )
  { return GetFileObj( _config, filetag, objtag ); }
 
  inline std::string GetFilePath( const std::string& filetag )
  { return GetFilePath( _config, filetag ); }
 
  static std::string
  GetFilePath( const edm::ParameterSet& config,
               const std::string&       filetag )
  {
    return config.getParameter<edm::FileInPath>( filetag ).fullPath();
  }
 
 
  static TObject*
  GetFileObj( const edm::ParameterSet& config,
              const std::string&       filetag,
              const std::string&       objtag )
  {
    const std::string filename = GetFilePath( config, filetag );
    const std::string objname  = config.getParameter<std::string>( objtag );
    TFile*            file     = TFile::Open( filename.c_str() );
    TObject*          ans      = file->Get( objname.c_str() )->Clone();
 
    // ans->SetDirectory(0); // Detach object from parent directory.
    file->Close();
    return ans;
  }
 
private:
  const edm::ParameterSet& _config;
};
 
typedef PluginAlias<edm::one::EDAnalyzer<edm::one::SharedResources> >
  EDAnalyzer;
typedef PluginAlias<edm::one::EDFilter<edm::one::SharedResources> >
  EDFilter;
 
}/* usr */
 
#endif/* end of include guard: USERUTILS_EDMUTILS_PLUGINALIAS_HPP */