/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/DPGAnalysis/Skims/src/PickEvents.cc

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// -*- C++ -*-
//
// Package:    PickEvents
// Class:      PickEvents
// 
//
// Original Author:  Michael Henry Schmitt
//         Created:  Mon Sep 15 19:36:37 CEST 2008
// $Id: PickEvents.cc,v 1.4 2010/08/07 14:55:55 wmtan Exp $
//         Modified: 27/03/2009 Luca Malgeri
//                   reading external file, defining selection syntax
//
//


// system include files
#include <memory>
#include <iostream>
#include <fstream>
#include <vector>
#include <sstream>
#include <limits>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDFilter.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/FileInPath.h"


//
// class declaration
//

class PickEvents : public edm::EDFilter {
   public:
      explicit PickEvents(const edm::ParameterSet&);
      ~PickEvents();

   private:
      virtual void beginJob() ;
      virtual bool filter(edm::Event&, const edm::EventSetup&);
      virtual void endJob() ;

  std::string listrunevents_; 
  std::string listruneventsinpath_; 
  
  std::vector<bool> whattodo;
  std::vector<edm::RunNumber_t> startrun;
  std::vector<edm::RunNumber_t> endrun;
  std::vector<edm::EventNumber_t> startevent;
  std::vector<edm::EventNumber_t> endevent;
  
  int nEventsAnalyzed;
  int nEventsSelected;
      
};



PickEvents::PickEvents(const edm::ParameterSet& iConfig)
{

  listruneventsinpath_=iConfig.getUntrackedParameter<std::string> ("RunEventList","");
  edm::FileInPath listruneventstmp("DPGAnalysis/Skims/data/"+listruneventsinpath_);

  listrunevents_=listruneventstmp.fullPath();

  std::cout <<"File with run/event list:"<< listrunevents_<<std::endl;

}


PickEvents::~PickEvents()
{
}

bool
PickEvents::filter(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace edm;

   RunNumber_t kRun   = iEvent.id().run();
   EventNumber_t kEvent = iEvent.id().event();

   bool selectThisEvent = false;

   for (unsigned int cond=0; cond<whattodo.size();cond++)
     {
       //       std::string what;
       if ( kRun>=startrun[cond] && 
            kRun<=endrun[cond]   &&
            kEvent>=startevent[cond] && 
            kEvent<=endevent[cond] ) 
         { // it's in the range, use
           selectThisEvent=whattodo[cond];
         }
     }
               
   nEventsAnalyzed++;
   if (selectThisEvent) nEventsSelected++;
   //   if (selectThisEvent) std::cout << "Event selected: " << kRun << " " << kEvent << std::endl;

   return selectThisEvent;
}

void 
PickEvents::beginJob()
{
  using namespace std;

  std::string line;
  std::string buf;

  std::stringstream ss;
  std::vector<std::string> tokens;

  nEventsAnalyzed = 0;
  nEventsSelected = 0;

  // open file listevent file
  ifstream listfile;
  listfile.open(listrunevents_.c_str());
  if (listfile.is_open())
    {
      while (! listfile.eof() )
        {
          getline (listfile,line);
          ss.clear();
          ss.str(line);
          tokens.clear();
          while (ss>>buf)
            {
              tokens.push_back(buf);
              //              std::cout << buf << std::endl;
            }         
          // std::cout << tokens.size() << std::endl;
          if (tokens.size()<3)
            {
              //              std::cout << "strange selection line:" << line << std::endl;
              //              std::cout << "skipping it" << std::endl;
              continue;
            }
          if(tokens[0]=="-" || tokens[0]=="+")
            {
              // it's a selection line, use it
              if(tokens[0]=="-") whattodo.push_back(false);
              else whattodo.push_back(true);

              // start with run selecion
              int loc=tokens[1].find(":",0);

              std::string first=tokens[1].substr(0,loc);
              startrun.push_back((edm::RunNumber_t)atoi(first.c_str()));

              std::string last=tokens[1].substr(loc+1,tokens[1].size());
              if (last=="infty")
                endrun.push_back(std::numeric_limits<unsigned int>::max());
              else
                endrun.push_back((edm::RunNumber_t) atoi(last.c_str()));

              // then event number selecion
              loc=tokens[2].find(":",0);

              first=tokens[2].substr(0,loc);
              startevent.push_back((edm::EventNumber_t)atoi(first.c_str()));

              last=tokens[2].substr(loc+1,tokens[2].size());
              if (last=="infty")
                endevent.push_back(edm::EventID::maxEventNumber());
              //                endevent.push_back(std::numeric_limits<long long int>::max());
              else
                endevent.push_back((edm::EventNumber_t)atoi(last.c_str()));

            }
        }
      listfile.close();
      // printout summary
      std::cout << "Summary from list of run/event number selection" << std::endl;
      for (unsigned int cond=0; cond<whattodo.size();cond++)
        {
          std::string what;
          if(whattodo[cond]) what="select";
          else what="reject";
          std::cout << what << " "; 
          std::cout << "from run " << startrun[cond] << " to run " << endrun[cond] << " ";
          std::cout << "from eve " << startevent[cond] << " to eve " << endevent[cond] << std::endl; 
        }
    }

  else std::cout << "Unable to open file"; 

}
void 
PickEvents::endJob() {
  using namespace std;
  std::cout << "================================================\n"
       << "  n Events Analyzed ............... " << nEventsAnalyzed << std::endl
       << "  n Events Selected ............... " << nEventsSelected<< std::endl
       << "================================================\n\n" ;
}


DEFINE_FWK_MODULE(PickEvents);