/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoLocalTracker/SiPixelClusterizer/plugins/SiPixelClusterProducer.cc

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// Our own stuff
#include "RecoLocalTracker/SiPixelClusterizer/interface/SiPixelClusterProducer.h"
#include "RecoLocalTracker/SiPixelClusterizer/interface/PixelThresholdClusterizer.h"

// Geometry
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/TrackerGeometryBuilder/interface/PixelGeomDetUnit.h"

// Data Formats
#include "DataFormats/Common/interface/DetSetVector.h"
#include "DataFormats/SiPixelDigi/interface/PixelDigi.h"
#include "DataFormats/DetId/interface/DetId.h"

// Database payloads
#include "CalibTracker/SiPixelESProducers/interface/SiPixelGainCalibrationService.h"
#include "CalibTracker/SiPixelESProducers/interface/SiPixelGainCalibrationOfflineService.h"
#include "CalibTracker/SiPixelESProducers/interface/SiPixelGainCalibrationForHLTService.h"

// Framework
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/ESHandle.h"

// STL
#include <vector>
#include <memory>
#include <string>
#include <iostream>

// MessageLogger
#include "FWCore/MessageLogger/interface/MessageLogger.h"

namespace cms
{

  //---------------------------------------------------------------------------
  //---------------------------------------------------------------------------
  SiPixelClusterProducer::SiPixelClusterProducer(edm::ParameterSet const& conf) 
    : 
    conf_(conf),
    theSiPixelGainCalibration_(0), 
    clusterMode_("None"),     // bogus
    clusterizer_(0),          // the default, in case we fail to make one
    readyToCluster_(false),   // since we obviously aren't
    src_( conf.getParameter<edm::InputTag>( "src" ) ),
    maxTotalClusters_( conf.getParameter<int32_t>( "maxNumberOfClusters" ) )
  {
    //--- Declare to the EDM what kind of collections we will be making.
    produces<SiPixelClusterCollectionNew>(); 

    std::string payloadType = conf.getParameter<std::string>( "payloadType" );

    if (strcmp(payloadType.c_str(), "HLT") == 0)
       theSiPixelGainCalibration_ = new SiPixelGainCalibrationForHLTService(conf);
    else if (strcmp(payloadType.c_str(), "Offline") == 0)
       theSiPixelGainCalibration_ = new SiPixelGainCalibrationOfflineService(conf);
    else if (strcmp(payloadType.c_str(), "Full") == 0)
       theSiPixelGainCalibration_ = new SiPixelGainCalibrationService(conf);

    //--- Make the algorithm(s) according to what the user specified
    //--- in the ParameterSet.
    setupClusterizer();

  }

  // Destructor
  SiPixelClusterProducer::~SiPixelClusterProducer() { 
    delete clusterizer_;
    delete theSiPixelGainCalibration_;
  }  

  //void SiPixelClusterProducer::beginJob( const edm::EventSetup& es ) 
  void SiPixelClusterProducer::beginJob( ) 
  {
    edm::LogInfo("SiPixelClusterizer") << "[SiPixelClusterizer::beginJob]";
    clusterizer_->setSiPixelGainCalibrationService(theSiPixelGainCalibration_);
  }
  
  //---------------------------------------------------------------------------
  //---------------------------------------------------------------------------
  void SiPixelClusterProducer::produce(edm::Event& e, const edm::EventSetup& es)
  {

    //Setup gain calibration service
    theSiPixelGainCalibration_->setESObjects( es );

   // Step A.1: get input data
    //edm::Handle<PixelDigiCollection> pixDigis;
    edm::Handle< edm::DetSetVector<PixelDigi> >  input;
    e.getByLabel( src_, input);

    // Step A.2: get event setup
    edm::ESHandle<TrackerGeometry> geom;
    es.get<TrackerDigiGeometryRecord>().get( geom );

    // Step B: create the final output collection
    std::auto_ptr<SiPixelClusterCollectionNew> output( new SiPixelClusterCollectionNew() );
    //FIXME: put a reserve() here

    // Step C: Iterate over DetIds and invoke the pixel clusterizer algorithm
    // on each DetUnit
    run(*input, geom, *output );

    // Step D: write output to file
    e.put( output );

  }

  //---------------------------------------------------------------------------
  //---------------------------------------------------------------------------
  void SiPixelClusterProducer::setupClusterizer()  {
    clusterMode_ = 
      conf_.getUntrackedParameter<std::string>("ClusterMode","PixelThresholdClusterizer");

    if ( clusterMode_ == "PixelThresholdClusterizer" ) {
      clusterizer_ = new PixelThresholdClusterizer(conf_);
      readyToCluster_ = true;
    } 
    else {
      edm::LogError("SiPixelClusterProducer") << "[SiPixelClusterProducer]:"
                <<" choice " << clusterMode_ << " is invalid.\n"
                << "Possible choices:\n" 
                << "    PixelThresholdClusterizer";
      readyToCluster_ = false;
    }
  }

  //---------------------------------------------------------------------------
  //---------------------------------------------------------------------------
  void SiPixelClusterProducer::run(const edm::DetSetVector<PixelDigi>   & input, 
                                   edm::ESHandle<TrackerGeometry>       & geom,
                                   edmNew::DetSetVector<SiPixelCluster> & output) {
    if ( ! readyToCluster_ ) {
      edm::LogError("SiPixelClusterProducer")
                <<" at least one clusterizer is not ready -- can't run!" ;
      // TO DO: throw an exception here?  The user may want to know...
      return;   // clusterizer is invalid, bail out
    }

    int numberOfDetUnits = 0;
    int numberOfClusters = 0;
 
    // Iterate on detector units
    edm::DetSetVector<PixelDigi>::const_iterator DSViter = input.begin();
    for( ; DSViter != input.end(); DSViter++) {
      ++numberOfDetUnits;

      //  LogDebug takes very long time, get rid off.
      //LogDebug("SiStripClusterizer") << "[SiPixelClusterProducer::run] DetID" << DSViter->id;

      std::vector<short> badChannels; 
      DetId detIdObject(DSViter->detId());
      
      // Comment: At the moment the clusterizer depends on geometry
      // to access information as the pixel topology (number of columns
      // and rows in a detector module). 
      // In the future the geometry service will be replaced with
      // a ES service.
      const GeomDetUnit      * geoUnit = geom->idToDetUnit( detIdObject );
      const PixelGeomDetUnit * pixDet  = dynamic_cast<const PixelGeomDetUnit*>(geoUnit);
      if (! pixDet) {
        // Fatal error!  TO DO: throw an exception!
        assert(0);
      }
      // Produce clusters for this DetUnit and store them in 
      // a DetSet
      edmNew::DetSetVector<SiPixelCluster>::FastFiller spc(output, DSViter->detId());
      clusterizer_->clusterizeDetUnit(*DSViter, pixDet, badChannels, spc);
      if ( spc.empty() ) {
        spc.abort();
      } else {
        numberOfClusters += spc.size();
      }

      if ((maxTotalClusters_ >= 0) && (numberOfClusters > maxTotalClusters_)) {
        edm::LogError("TooManyClusters") <<  "Limit on the number of clusters exceeded. An empty cluster collection will be produced instead.\n";
        edmNew::DetSetVector<SiPixelCluster> empty;
        empty.swap(output);
        break;
      }
    } // end of DetUnit loop
    
    //LogDebug ("SiPixelClusterProducer") << " Executing " 
    //      << clusterMode_ << " resulted in " << numberOfClusters
    //                              << " SiPixelClusters in " << numberOfDetUnits << " DetUnits."; 
  }

}  // end of namespace cms