STGC_RdoToDigit.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "STGC_RdoToDigit.h"
 
 
StatusCode STGC_RdoToDigit::initialize() {
    ATH_CHECK(m_idHelperSvc.retrieve());
    ATH_CHECK(m_stgcRdoDecoderTool.retrieve());
    ATH_CHECK(m_stgcRdoKey.initialize());
    ATH_CHECK(m_stgcDigitKey.initialize());
    return StatusCode::SUCCESS;
}
 
StatusCode STGC_RdoToDigit::execute(const EventContext& ctx) const {
    ATH_MSG_DEBUG("in execute()");
    SG::ReadHandle<Muon::STGC_RawDataContainer> rdoRH(m_stgcRdoKey, ctx);
    if (!rdoRH.isValid()) {
        ATH_MSG_ERROR("No STGC RDO container found!");
        return StatusCode::FAILURE;
    }
    const Muon::STGC_RawDataContainer* rdoContainer = rdoRH.cptr();
    ATH_MSG_DEBUG("Retrieved " << rdoContainer->size() << " sTGC RDOs.");
 
    SG::WriteHandle<sTgcDigitContainer> wh_stgcDigit(m_stgcDigitKey, ctx);
    ATH_CHECK(wh_stgcDigit.record(std::make_unique<sTgcDigitContainer>(m_idHelperSvc->stgcIdHelper().detectorElement_hash_max())));
    ATH_MSG_DEBUG("Decoding sTGC RDO into sTGC Digit");
 
    // retrieve the collection of RDO
    Identifier oldId;
    sTgcDigitCollection* collection = nullptr;
    // now decode RDO into digits
    for (const Muon::STGC_RawDataCollection* coll : *rdoContainer) {
        ATH_CHECK(this->decodeSTGC(ctx, coll, wh_stgcDigit.ptr(), collection, oldId));
    }
 
    return StatusCode::SUCCESS;
}
 
StatusCode STGC_RdoToDigit::decodeSTGC(const EventContext& ctx, const Muon::STGC_RawDataCollection* rdoColl, sTgcDigitContainer* stgcContainer,
                                       sTgcDigitCollection*& collection, Identifier& oldId) const {
    const IdContext stgcContext = m_idHelperSvc->stgcIdHelper().module_context();
 
    if (!rdoColl->empty()) {
        ATH_MSG_DEBUG(" Number of RawData in this rdo " << rdoColl->size());
 
        // for each RDO, loop over RawData, converter RawData to digit
        // retrieve/create digit collection, and insert digit into collection
        for (const Muon::STGC_RawData* data : *rdoColl) {
            sTgcDigit* newDigit = m_stgcRdoDecoderTool->getDigit(ctx, data);
            if (!newDigit) {
                ATH_MSG_ERROR("Error in sTGC RDO decoder");
                continue;
            }
 
            uint16_t relBcid = newDigit->bcTag();
            uint16_t bcTag = 0;
            // Triggering bunch crossing is set to relative_BCID = 3
            if (relBcid == 3)
                bcTag = 0;
            else if (relBcid < 3)
                bcTag = ~(3 - relBcid);
            else if (relBcid > 3)
                bcTag = (relBcid - 3);
            newDigit->set_bcTag(bcTag);
 
            // find here the Proper Digit Collection identifier, using the rdo-hit id
            // (since RDO collections are not in a 1-to-1 relation with digit collections)
            const Identifier elementId = m_idHelperSvc->stgcIdHelper().elementID(newDigit->identify());
            IdentifierHash coll_hash;
            if (m_idHelperSvc->stgcIdHelper().get_hash(elementId, coll_hash, &stgcContext)) {
                ATH_MSG_WARNING("Unable to get STGC digit collection hash id "
                                << "context begin_index = " << stgcContext.begin_index()
                                << " context end_index  = " << stgcContext.end_index() << " the identifier is ");
                elementId.show();
            }
 
            if (oldId != elementId) {
                const sTgcDigitCollection* coll = stgcContainer->indexFindPtr(coll_hash);
                if (nullptr == coll) {
                    sTgcDigitCollection* newCollection = new sTgcDigitCollection(elementId, coll_hash);
                    newCollection->push_back(newDigit);
                    collection = newCollection;
                    if (stgcContainer->addCollection(newCollection, coll_hash).isFailure())
                        ATH_MSG_WARNING("Couldn't record sTgcDigitCollection with key=" << coll_hash << " in StoreGate!");
                } else {
                    sTgcDigitCollection* oldCollection ATLAS_THREAD_SAFE = const_cast<sTgcDigitCollection*>(coll);  // FIXME
                    oldCollection->push_back(newDigit);
                    collection = oldCollection;
                }
                oldId = elementId;
            } else {
                collection->push_back(newDigit);
            }
        }
    }
    return StatusCode::SUCCESS;
}