LHESource.cc

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#include <algorithm>
#include <functional>
#include <iostream>
#include <string>
#include <memory>

#include <boost/bind.hpp>
#include <boost/ptr_container/ptr_deque.hpp>

#include "FWCore/Framework/interface/InputSourceMacros.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/EventPrincipal.h"
#include "FWCore/Framework/interface/LuminosityBlockPrincipal.h"
#include "FWCore/Framework/interface/RunPrincipal.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/TypeID.h"

#include "DataFormats/Common/interface/OrphanHandle.h"

#include "SimDataFormats/GeneratorProducts/interface/LesHouches.h"
#include "SimDataFormats/GeneratorProducts/interface/LHERunInfoProduct.h"
#include "SimDataFormats/GeneratorProducts/interface/LHEEventProduct.h"

#include "GeneratorInterface/LHEInterface/interface/LHERunInfo.h"
#include "GeneratorInterface/LHEInterface/interface/LHEEvent.h"
#include "GeneratorInterface/LHEInterface/interface/LHEReader.h"

#include "LHESource.h"

using namespace lhef;

LHESource::LHESource(const edm::ParameterSet &params,
                     const edm::InputSourceDescription &desc) :
    ProducerSourceFromFiles(params, desc, false),
    reader(new LHEReader(fileNames(), params.getUntrackedParameter<unsigned int>("skipEvents", 0))),
    wasMerged(false),
    lheProvenanceHelper_(edm::TypeID(typeid(LHEEventProduct)), edm::TypeID(typeid(LHERunInfoProduct)), productRegistryUpdate()),
    phid_(),
        runPrincipal_()
{
        nextEvent();
        lheProvenanceHelper_.lheAugment(runInfo.get());
    // Initialize metadata, and save the process history ID for use every event.
    phid_ = lheProvenanceHelper_.lheInit(processHistoryRegistryForUpdate());

        // These calls are not wanted, because the principals are used for putting the products.
    //produces<LHEEventProduct>();
    //produces<LHERunInfoProduct, edm::InRun>();
}

LHESource::~LHESource()
{
}

void LHESource::endJob()
{
    reader.reset();
}

void LHESource::nextEvent()
{
    if (partonLevel) {
        return;
        }

    bool newFileOpened = false;
    partonLevel = reader->next(&newFileOpened);

    if (!partonLevel) {
        return;
        }

    boost::shared_ptr<LHERunInfo> runInfoThis = partonLevel->getRunInfo();
    if (runInfoThis != runInfoLast) {
        runInfo = runInfoThis;
        runInfoLast = runInfoThis;
    }
    if (runInfo) {
        std::auto_ptr<LHERunInfoProduct> product(
                new LHERunInfoProduct(*runInfo->getHEPRUP()));
        std::for_each(runInfo->getHeaders().begin(),
                      runInfo->getHeaders().end(),
                      boost::bind(
                        &LHERunInfoProduct::addHeader,
                        product.get(), _1));
        std::for_each(runInfo->getComments().begin(),
                      runInfo->getComments().end(),
                      boost::bind(&LHERunInfoProduct::addComment,
                        product.get(), _1));

        if (!runInfoProducts.empty()) {
          if (runInfoProducts.front().mergeProduct(*product)) {
            if (!wasMerged) {
                runInfoProducts.pop_front();
                runInfoProducts.push_front(product);
                wasMerged = true;
            }
          } else {
                    lheProvenanceHelper_.lheAugment(runInfo.get());
                    // Initialize metadata, and save the process history ID for use every event.
                    phid_ = lheProvenanceHelper_.lheInit(processHistoryRegistryForUpdate());
            resetRunAuxiliary();
          }
        }

        runInfo.reset();
    }
}

// This is the only way we can now access the run principal.
void
LHESource::readRun_(edm::RunPrincipal& runPrincipal) {
  runAuxiliary()->setProcessHistoryID(phid_);
  runPrincipal.fillRunPrincipal(processHistoryRegistryForUpdate());
  runPrincipal_ = &runPrincipal;
}

void
LHESource::readLuminosityBlock_(edm::LuminosityBlockPrincipal& lumiPrincipal) {
  luminosityBlockAuxiliary()->setProcessHistoryID(phid_);
  lumiPrincipal.fillLuminosityBlockPrincipal(processHistoryRegistryForUpdate());
}

void LHESource::beginRun(edm::Run&)
{
    if (runInfoLast) {
        runInfo = runInfoLast;

        std::unique_ptr<LHERunInfoProduct> product(
                new LHERunInfoProduct(*runInfo->getHEPRUP()));
        std::for_each(runInfo->getHeaders().begin(),
                      runInfo->getHeaders().end(),
                      boost::bind(
                        &LHERunInfoProduct::addHeader,
                        product.get(), _1));
        std::for_each(runInfo->getComments().begin(),
                      runInfo->getComments().end(),
                      boost::bind(&LHERunInfoProduct::addComment,
                        product.get(), _1));

        // keep a copy around in case of merging
        runInfoProducts.push_back(new LHERunInfoProduct(*product));
        wasMerged = false;

                std::unique_ptr<edm::WrapperBase> rdp(new edm::Wrapper<LHERunInfoProduct>(std::move(product)));
        runPrincipal_->put(lheProvenanceHelper_.runProductBranchDescription_, std::move(rdp));

        runInfo.reset();
    }
}

void LHESource::endRun(edm::Run&)
{
    if (!runInfoProducts.empty()) {
        std::unique_ptr<LHERunInfoProduct> product(
                    runInfoProducts.pop_front().release());
                std::unique_ptr<edm::WrapperBase> rdp(new edm::Wrapper<LHERunInfoProduct>(std::move(product)));
        runPrincipal_->put(lheProvenanceHelper_.runProductBranchDescription_, std::move(rdp));
    }
    runPrincipal_ = nullptr;
}

bool LHESource::setRunAndEventInfo(edm::EventID&, edm::TimeValue_t&, edm::EventAuxiliary::ExperimentType&)
{
    nextEvent();
    if (!partonLevel) {
                // We just finished an input file. See if there is another.
                nextEvent();
            if (!partonLevel) {
                        // No more input files.
                return false;
                }
        }
        return true;
}

void
LHESource::readEvent_(edm::EventPrincipal& eventPrincipal) {
    assert(eventCached() || processingMode() != RunsLumisAndEvents);
    edm::EventAuxiliary aux(eventID(), processGUID(), edm::Timestamp(presentTime()), false);
    aux.setProcessHistoryID(phid_);
    eventPrincipal.fillEventPrincipal(aux, processHistoryRegistryForUpdate());

    std::unique_ptr<LHEEventProduct> product(
             new LHEEventProduct(*partonLevel->getHEPEUP(),
                     partonLevel->originalXWGTUP())
             );
    if (partonLevel->getPDF()) {
        product->setPDF(*partonLevel->getPDF());
        }       
    std::for_each(partonLevel->weights().begin(),
              partonLevel->weights().end(),
              boost::bind(&LHEEventProduct::addWeight,
                  product.get(), _1));
        product->setScales(partonLevel->scales());
        product->setNpLO(partonLevel->npLO());
        product->setNpNLO(partonLevel->npNLO());
    std::for_each(partonLevel->getComments().begin(),
                  partonLevel->getComments().end(),
                  boost::bind(&LHEEventProduct::addComment,
                              product.get(), _1));

    std::unique_ptr<edm::WrapperBase> edp(new edm::Wrapper<LHEEventProduct>(std::move(product)));
    eventPrincipal.put(lheProvenanceHelper_.eventProductBranchDescription_, std::move(edp), lheProvenanceHelper_.eventProductProvenance_);

    partonLevel.reset();

    resetEventCached();
}

DEFINE_FWK_INPUT_SOURCE(LHESource);