/data/refman/pasoursint/CMSSW_5_2_7_hltpatch1/src/GeneratorInterface/LHEInterface/plugins/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/Sources/interface/ExternalInputSource.h"
#include "FWCore/Framework/interface/InputSourceMacros.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/Run.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.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) :
        ExternalInputSource(params, desc, false),
        reader(new LHEReader(fileNames(), params.getUntrackedParameter<unsigned int>("skipEvents", 0))),
        wasMerged(false)
{
        produces<LHEEventProduct>();
        produces<LHERunInfoProduct, edm::InRun>();
}

LHESource::~LHESource()
{
}

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

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

        partonLevel = reader->next();
        if (!partonLevel)
                        return;

        boost::shared_ptr<LHERunInfo> runInfoThis = partonLevel->getRunInfo();
        if (runInfoThis != runInfoLast) {
                runInfo = runInfoThis;
                runInfoLast = runInfoThis;
        }
}

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

                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));

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

                run.put(product);

                runInfo.reset();
        }
}

void LHESource::endRun(edm::Run &run)
{
        if (!runInfoProducts.empty()) {
                std::auto_ptr<LHERunInfoProduct> product(
                                        runInfoProducts.pop_front().release());
                run.put(product);
        }
}

bool LHESource::produce(edm::Event &event)
{
        nextEvent();
        if (!partonLevel)
                return false;

        std::auto_ptr<LHEEventProduct> product(
                        new LHEEventProduct(*partonLevel->getHEPEUP()));
        if (partonLevel->getPDF())
                product->setPDF(*partonLevel->getPDF());
        std::for_each(partonLevel->getComments().begin(),
                      partonLevel->getComments().end(),
                      boost::bind(&LHEEventProduct::addComment,
                                  product.get(), _1));
        event.put(product);

        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()) {
                        runInfoProducts.front().mergeProduct(*product);
                        if (!wasMerged) {
                                runInfoProducts.pop_front();
                                runInfoProducts.push_front(product);
                                wasMerged = true;
                        }
                }

                runInfo.reset();
        }

        partonLevel.reset();
        return true;
}

DEFINE_FWK_INPUT_SOURCE(LHESource);