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File indexing completed on 2021-08-28 03:59:13

0001 #include "PhysicsTools/PatAlgos/interface/VertexingHelper.h"
0002 #include <algorithm>
0003 
0004 #include <iostream>
0005 
0006 #include "TrackingTools/Records/interface/TransientTrackRecord.h"
0007 #include "TrackingTools/TransientTrack/interface/TransientTrack.h"
0008 #include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
0009 #include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
0010 
0011 pat::helper::VertexingHelper::VertexingHelper(const edm::ParameterSet &iConfig, edm::ConsumesCollector &&iC) {
0012   if (!iConfig.empty()) {
0013     enabled_ = true;
0014     if (iConfig.existsAs<edm::InputTag>("vertexAssociations") == iConfig.existsAs<edm::InputTag>("vertices")) {
0015       throw cms::Exception("Configuration") << "VertexingHelper: you must configure either 'vertices' (to produce "
0016                                                "associations) or 'vertexAssociations' (to read them from disk), "
0017                                             << "you can't specify both, nor you can specify none!\n";
0018     }
0019 
0020     if (iConfig.existsAs<edm::InputTag>("vertexAssociations")) {
0021       playback_ = true;
0022       vertexAssociationsToken_ = iC.consumes<edm::ValueMap<pat::VertexAssociation> >(
0023           iConfig.getParameter<edm::InputTag>("vertexAssociations"));
0024     }
0025     if (iConfig.existsAs<edm::InputTag>("vertices")) {  // vertex have been specified, so run on the fly
0026       playback_ = false;
0027       verticesToken_ = iC.consumes<reco::VertexCollection>(iConfig.getParameter<edm::InputTag>("vertices"));
0028       // ------ MODE ------------------
0029       useTracks_ = iConfig.getParameter<bool>("useTracks");
0030       // ------ CUTS (fully optional) ------------------
0031     }
0032     assoSelector_ = reco::modules::make<pat::VertexAssociationSelector>(iConfig);
0033   } else {
0034     enabled_ = false;
0035   }
0036   if (!playback_) {
0037     ttToken_ = iC.esConsumes(edm::ESInputTag("", "TransientTrackBuilder"));
0038   }
0039 }
0040 
0041 void pat::helper::VertexingHelper::newEvent(const edm::Event &iEvent) {
0042   if (playback_) {
0043     iEvent.getByToken(vertexAssociationsToken_, vertexAssoMap_);
0044   } else {
0045     iEvent.getByToken(verticesToken_, vertexHandle_);
0046   }
0047 }
0048 
0049 void pat::helper::VertexingHelper::newEvent(const edm::Event &iEvent, const edm::EventSetup &iSetup) {
0050   newEvent(iEvent);
0051   if (!playback_)
0052     ttBuilder_ = iSetup.getHandle(ttToken_);
0053 }
0054 
0055 pat::VertexAssociation pat::helper::VertexingHelper::associate(const reco::Candidate &c) const {
0056   if (playback_)
0057     throw cms::Exception("Configuration")
0058         << "VertexingHelper: if this module was configured to read associations from the event,"
0059         << " you must use 'operator()' passing a candidate ref, and not 'associate()' directly!\n";
0060 
0061   reco::VertexCollection::const_iterator vtx, end;
0062   size_t ivtx;
0063   reco::TrackBaseRef tk;
0064   reco::TransientTrack tt;
0065   if (useTracks_) {
0066     if (!ttBuilder_.isValid())
0067       throw cms::Exception("Configuration")
0068           << "VertexingHelper: If you use 'useTracks', you must call newEvent(iEvent,iSetup)!\n";
0069     tk = getTrack_(c);
0070     if (tk.isNull())
0071       return pat::VertexAssociation();
0072     tt = ttBuilder_->build(*tk);
0073   }
0074   for (vtx = vertexHandle_->begin(), end = vertexHandle_->end(), ivtx = 0; vtx != end; ++vtx, ++ivtx) {
0075     pat::VertexAssociation association(reco::VertexRef(vertexHandle_, ivtx), tk);
0076     if (useTracks_ == false) {
0077       association.setDistances(c.vertex(), vtx->position(), vtx->error());
0078     } else {
0079       GlobalPoint vtxGP(vtx->x(), vtx->y(), vtx->z());  // need to convert XYZPoint to GlobalPoint
0080       TrajectoryStateClosestToPoint tscp = tt.trajectoryStateClosestToPoint(vtxGP);
0081       GlobalPoint trackPos = tscp.theState().position();
0082       AlgebraicSymMatrix33 trackErr = tscp.theState().cartesianError().matrix().Sub<AlgebraicSymMatrix33>(0, 0);
0083       association.setDistances(trackPos, vtx->position(), trackErr + vtx->error());
0084     }
0085     if (assoSelector_(association))
0086       return association;
0087   }
0088   return pat::VertexAssociation();
0089 }
0090 
0091 reco::TrackBaseRef pat::helper::VertexingHelper::getTrack_(const reco::Candidate &c) const {
0092   const reco::RecoCandidate *rc = dynamic_cast<const reco::RecoCandidate *>(&c);
0093   if (rc != nullptr) {
0094     return rc->bestTrackRef();
0095   }
0096   const reco::PFCandidate *pfc = dynamic_cast<const reco::PFCandidate *>(&c);
0097   if (pfc != nullptr) {
0098     return reco::TrackBaseRef(pfc->trackRef());
0099   }
0100 
0101   return reco::TrackBaseRef();
0102 }