/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Validation/RecoTau/plugins/DQMHistNormalizer.cc

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// framework & common header files
#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"


//DQM services
#include "DQMServices/Core/interface/DQMStore.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "DQMServices/Core/interface/MonitorElement.h"
#include "DQMServices/Core/src/DQMError.h"


//Regexp handling
#include "classlib/utils/RegexpMatch.h"
#include "classlib/utils/Regexp.h"


#include <string>
#include <vector>
#include <map>

using namespace std;


class DQMHistNormalizer : public edm::EDAnalyzer
{

 public:
  explicit DQMHistNormalizer(const edm::ParameterSet&);
  virtual ~DQMHistNormalizer();
  virtual void analyze(const edm::Event&, const edm::EventSetup&);
  virtual void endJob(){}
  virtual void endRun(const edm::Run& r, const edm::EventSetup& c);

private:
  lat::Regexp* buildRegex(const string & expr);
  vector<string> plotNamesToNormalize_; //root name used by all the plots that must be normalized
  string reference_;
};

DQMHistNormalizer::DQMHistNormalizer(const edm::ParameterSet& cfg):
  plotNamesToNormalize_(cfg.getParameter< std::vector<string> >("plotNamesToNormalize")),
  reference_(cfg.getParameter< string >("reference"))
{
  //std::cout << "<DQMHistNormalizer::DQMHistNormalizer>:" << std::endl;
}

DQMHistNormalizer::~DQMHistNormalizer() 
{
//--- nothing to be done yet
}

void DQMHistNormalizer::analyze(const edm::Event&, const edm::EventSetup&)
{
//--- nothing to be done yet
}

lat::Regexp* DQMHistNormalizer::buildRegex(const string & expr)
{
  lat::Regexp* rx = 0;
  try
  {
    rx = new lat::Regexp(expr, 0, lat::Regexp::Wildcard);
    rx->study();
  }
  catch (lat::Error &e)
  {
    raiseDQMError("DQMStore", "Invalid regular expression '%s': %s",
                  expr.c_str(), e.explain().c_str());
  }
  return rx;
}

void DQMHistNormalizer::endRun(const edm::Run& r, const edm::EventSetup& c)
{
  //std::cout << "<DQMHistNormalizer::endJob>:" << std::endl;

//--- check that DQMStore service is available
  if ( !edm::Service<DQMStore>().isAvailable() ) {
    edm::LogError ("endJob") << " Failed to access dqmStore --> histograms will NOT be plotted !!";
    return;
  }

  DQMStore& dqmStore = (*edm::Service<DQMStore>());

  vector<MonitorElement *> allOurMEs = dqmStore.getAllContents("RecoTauV/");
  lat::Regexp* refregex = buildRegex("*RecoTauV/*/" + reference_);
  vector<lat::Regexp*> toNormRegex;
  for ( std::vector<string>::const_iterator toNorm = plotNamesToNormalize_.begin(); toNorm != plotNamesToNormalize_.end(); ++toNorm )
    toNormRegex.push_back( buildRegex("*RecoTauV/*/" + *toNorm) );

  map<string, MonitorElement *> refsMap;
  vector<MonitorElement *> toNormElements;

  for(vector<MonitorElement *>::const_iterator element = allOurMEs.begin(); element != allOurMEs.end(); ++element){
    string pathname = (*element)->getFullname();
    //cout << pathname << endl;
    //Matches reference
    if(refregex->match(pathname)){
      //cout << "Matched to ref" << endl;
      string dir = pathname.substr(0, pathname.rfind("/"));
      if(refsMap.find(dir) != refsMap.end()){
        edm::LogInfo("DQMHistNormalizer")<<"DQMHistNormalizer::endRun: Warning! found multiple normalizing references for dir: "<<dir<<"!";
        edm::LogInfo("DQMHistNormalizer")<<"     " << (refsMap[dir])->getFullname();
        edm::LogInfo("DQMHistNormalizer")<<"     " << pathname;
      }
      else{
        refsMap[dir] = *element;
      }
    }

    //Matches targets
    for(vector<lat::Regexp*>::const_iterator reg = toNormRegex.begin(); reg != toNormRegex.end(); ++reg){
      if((*reg)->match(pathname)){
        //cout << "Matched to target" << endl;
        toNormElements.push_back(*element);
        //cout << "Filled the collection" << endl;
      }
    }
  }

  delete refregex;
  for(vector<lat::Regexp*>::const_iterator reg = toNormRegex.begin(); reg != toNormRegex.end(); ++reg)
    delete *reg;

  for(vector<MonitorElement *>::const_iterator matchingElement = toNormElements.begin(); matchingElement != toNormElements.end(); ++matchingElement){
    string meName = (*matchingElement)->getFullname();
    string dir = meName.substr(0, meName.rfind("/"));
    
    if(refsMap.find(dir) == refsMap.end()){
      edm::LogInfo("DQMHistNormalizer")<<"DQMHistNormalizer::endRun: Error! normalizing references for "<<meName<<" not found! Skipping...";
      continue;
    }
      
    float norm = refsMap[dir]->getTH1()->GetEntries();
    TH1* hist = (*matchingElement)->getTH1();
    if ( norm != 0. ) {
      if( !hist->GetSumw2N() ) hist->Sumw2();
      hist->Scale(1/norm);//use option "width" to divide the bin contents and errors by the bin width?
    }else{
      edm::LogInfo("DQMHistNormalizer")<<"DQMHistNormalizer::endRun: Error! Normalization failed in "<<hist->GetTitle()<<"!";
    }
      
  }//    for(vector<MonitorElement *>::const_iterator matchingElement = matchingElemts.begin(); matchingElement = matchingElemts.end(); ++matchingElement)
}

DEFINE_FWK_MODULE(DQMHistNormalizer);