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 // Copyright 2022, David Lawrence
 // Subject to the terms in the LICENSE file found in the top-level directory.
 //
 //
 // This is a JANA event source that uses PODIO to read from a ROOT
 // file created using the EDM4hep Data Model.
 
 #include "JEventSourcePODIO.h"
 
 #include <JANA/JApplication.h>
 #include <JANA/JEvent.h>
 #include <JANA/JException.h>
 #include <JANA/JLogger.h>
 #include <JANA/Utils/JTypeInfo.h>
 #include <TFile.h>
 #include <TObject.h>
 #include <fmt/color.h>
 #include <fmt/core.h>
 #include <fmt/format.h>
 #include <podio/CollectionBase.h>
 #include <podio/Frame.h>
 #include <podio/podioVersion.h>
 #include <algorithm>
 #include <cstdlib>
 #include <exception>
 #include <filesystem>
 #include <iostream>
 #include <map>
 #include <utility>
 #include <vector>
 
 // These files are generated automatically by make_datamodel_glue.py
 #include "services/io/podio/datamodel_glue.h"
 #include "services/io/podio/datamodel_includes.h" // IWYU pragma: keep
 
 
 //------------------------------------------------------------------------------
 // InsertingVisitor
 //
 /// This datamodel visitor will insert a PODIO collection into a JEvent.
 /// This allows us to access the PODIO data through JEvent::Get and JEvent::GetCollection.
 /// This makes it transparent to downstream factories whether the data was loaded from file, or calculated.
 /// InsertingVisitor is called in GetEvent()
 ///
 /// \param event             JANA JEvent to copy the data objects into
 /// \param collection_name   name of the collection which will be used as the factory tag for these objects
 //------------------------------------------------------------------------------
 struct InsertingVisitor {
     JEvent& m_event;
     const std::string& m_collection_name;
 
     InsertingVisitor(JEvent& event, const std::string& collection_name) : m_event(event), m_collection_name(collection_name){};
 
     template <typename T>
     void operator() (const T& collection) {
 
         using ContentsT = decltype(collection[0]);
         m_event.InsertCollectionAlreadyInFrame<ContentsT>(&collection, m_collection_name);
     }
 };
 
 
 //------------------------------------------------------------------------------
 // Constructor
 //
 ///
 /// \param resource_name  Name of root file to open (n.b. file is not opened until Open() is called)
 /// \param app            JApplication
 //------------------------------------------------------------------------------
 JEventSourcePODIO::JEventSourcePODIO(std::string resource_name, JApplication* app) : JEventSource(resource_name, app) {
     SetTypeName(NAME_OF_THIS); // Provide JANA with class name
 
     // Tell JANA that we want it to call the FinishEvent() method.
     // EnableFinishEvent();
 
     // Allow user to specify to recycle events forever
     GetApplication()->SetDefaultParameter(
             "podio:run_forever",
             m_run_forever,
             "set to true to recycle through events continuously"
             );
 
     bool print_type_table = false;
     GetApplication()->SetDefaultParameter(
             "podio:print_type_table",
             print_type_table,
             "Print list of collection names and their types"
             );
 
     // Hopefully we won't need to reimplement background event merging. Using podio frames, it looks like we would
     // have to do a deep copy of all data in order to insert it into the same frame, which would probably be
     // quite inefficient.
     /*
     std::string background_filename;
     GetApplication()->SetDefaultParameter(
             "podio:background_filename",
             background_filename,
             "Name of file containing background events to merge in (default is not to merge any background)"
             );
 
     int num_background_events=1;
     GetApplication()->SetDefaultParameter(
             "podio:num_background_events",
             num_background_events,
             "Number of background events to add to every primary event."
     );
     */
 }
 
 //------------------------------------------------------------------------------
 // Destructor
 //------------------------------------------------------------------------------
 JEventSourcePODIO::~JEventSourcePODIO() {
     LOG << "Closing Event Source for " << GetResourceName() << LOG_END;
 }
 
 //------------------------------------------------------------------------------
 // Open
 //
 /// Open the root file and read in metadata.
 //------------------------------------------------------------------------------
 void JEventSourcePODIO::Open() {
 
     bool print_type_table = GetApplication()->GetParameterValue<bool>("podio:print_type_table");
     // std::string background_filename = GetApplication()->GetParameterValue<std::string>("podio:background_filename");;
     // int num_background_events = GetApplication()->GetParameterValue<int>("podio:num_background_events");;
 
     // Open primary events file
     try {
 
         // Verify file exists
         if( ! std::filesystem::exists(GetResourceName()) ){
             // Here we go against the standard practice of throwing an error and print
             // the message and exit immediately. This is because we want the last message
             // on the screen to be that the file doesn't exist.
             auto mess = fmt::format(fmt::emphasis::bold | fg(fmt::color::red),"ERROR: ");
             mess += fmt::format(fmt::emphasis::bold, "file: {} does not exist!",  GetResourceName());
             std::cerr << std::endl << std::endl << mess << std::endl << std::endl;
             std::_Exit(EXIT_FAILURE);
         }
 
         m_reader.openFile( GetResourceName() );
 
         auto version = m_reader.currentFileVersion();
         bool version_mismatch = version.major > podio::version::build_version.major;
         version_mismatch |= (version.major == podio::version::build_version.major) && (version.minor>podio::version::build_version.minor);
         if( version_mismatch ) {
             std::stringstream ss;
             ss << "Mismatch in PODIO versions! " << version << " > " << podio::version::build_version;
             // FIXME: The podio ROOTReader is somehow failing to read in the correct version numbers from the file
 //            throw JException(ss.str());
         }
 
         LOG << "PODIO version: file=" << version << " (executable=" << podio::version::build_version << ")" << LOG_END;
 
         Nevents_in_file = m_reader.getEntries("events");
         LOG << "Opened PODIO Frame file \"" << GetResourceName() << "\" with " << Nevents_in_file << " events" << LOG_END;
 
         if( print_type_table ) PrintCollectionTypeTable();
 
     }catch (std::exception &e ){
         LOG_ERROR(default_cerr_logger) << e.what() << LOG_END;
         throw JException( fmt::format( "Problem opening file \"{}\"", GetResourceName() ) );
     }
 
 }
 
 //------------------------------------------------------------------------------
 // Close
 //
 /// Cleanly close the resource when JANA is terminated via Ctrl-C or jana:nevents
 ///
 /// \param event
 //------------------------------------------------------------------------------
 void JEventSourcePODIO::Close() {
     // m_reader.close();
     // TODO: ROOTFrameReader does not appear to have a close() method.
 }
 
 
 //------------------------------------------------------------------------------
 // GetEvent
 //
 /// Read next event from file and copy its objects into the given JEvent.
 ///
 /// \param event
 //------------------------------------------------------------------------------
 void JEventSourcePODIO::GetEvent(std::shared_ptr<JEvent> event) {
 
     /// Calls to GetEvent are synchronized with each other, which means they can
     /// read and write state on the JEventSource without causing race conditions.
 
     // Check if we have exhausted events from file
     if( Nevents_read >= Nevents_in_file ) {
         if( m_run_forever ){
             Nevents_read = 0;
         }else{
             // m_reader.close();
             // TODO:: ROOTFrameReader does not appear to have a close() method.
             throw RETURN_STATUS::kNO_MORE_EVENTS;
         }
     }
 
     auto frame_data = m_reader.readEntry("events", Nevents_read);
     auto frame = std::make_unique<podio::Frame>(std::move(frame_data));
 
     const auto& event_headers = frame->get<edm4hep::EventHeaderCollection>("EventHeader"); // TODO: What is the collection name?
     if (event_headers.size() != 1) {
         throw JException("Bad event headers: Entry %d contains %d items, but 1 expected.", Nevents_read, event_headers.size());
     }
     event->SetEventNumber(event_headers[0].getEventNumber());
     event->SetRunNumber(event_headers[0].getRunNumber());
 
     // Insert contents odf frame into JFactories
     VisitPodioCollection<InsertingVisitor> visit;
     for (const std::string& coll_name : frame->getAvailableCollections()) {
         const podio::CollectionBase* collection = frame->get(coll_name);
         InsertingVisitor visitor(*event, coll_name);
         visit(visitor, *collection);
     }
 
     event->Insert(frame.release()); // Transfer ownership from unique_ptr to JFactoryT<podio::Frame>
     Nevents_read += 1;
 }
 
 //------------------------------------------------------------------------------
 // GetDescription
 //------------------------------------------------------------------------------
 std::string JEventSourcePODIO::GetDescription() {
 
     /// GetDescription() helps JANA explain to the user what is going on
     return "PODIO root file (Frames, podio >= v0.16.3)";
 }
 
 //------------------------------------------------------------------------------
 // CheckOpenable
 //
 /// Return a value from 0-1 indicating probability that this source will be
 /// able to read this root file. Currently, it simply checks that the file
 /// name contains the string ".root" and if does, returns a small number (0.02).
 /// This will need to be made more sophisticated if the alternative root file
 /// formats need to be supported by other event sources.
 ///
 /// \param resource_name name of root file to evaluate.
 /// \return              value from 0-1 indicating confidence that this source can open the given file
 //------------------------------------------------------------------------------
 template <>
 double JEventSourceGeneratorT<JEventSourcePODIO>::CheckOpenable(std::string resource_name) {
 
     // PODIO Frame reader gets slightly higher precedence than PODIO Legacy reader, but only if the file
     // contains a 'podio_metadata' TTree. If the file doesn't exist, this will return 0. The "file not found"
     // error will hopefully be generated by the PODIO legacy reader instead.
     if (resource_name.find(".root") == std::string::npos ) return 0.0;
 
     // PODIO FrameReader segfaults on legacy input files, so we use ROOT to validate beforehand. Of course,
     // we can't validate if ROOT can't read the file.
     std::unique_ptr<TFile> file = std::make_unique<TFile>(resource_name.c_str());
     if (!file || file->IsZombie()) return 0.0;
 
     // We test the format the same way that PODIO's python API does. See python/podio/reading.py
     TObject* tree = file->Get("podio_metadata");
     if (tree == nullptr) return 0.0;
     return 0.03;
 }
 
 //------------------------------------------------------------------------------
 // PrintCollectionTypeTable
 //
 /// Print the list of collection names from the currently open file along
 /// with their types. This will be called automatically when the file is
 /// open if the PODIO:PRINT_TYPE_TABLE variable is set to a non-zero value
 //------------------------------------------------------------------------------
 void JEventSourcePODIO::PrintCollectionTypeTable(void) {
 
     // Read the zeroth entry. This assumes that m_reader has already been initialized with a valid filename
     auto frame_data = m_reader.readEntry("events", 0);
     auto frame = std::make_unique<podio::Frame>(std::move(frame_data));
 
     std::map<std::string, std::string> collectionNames;
     size_t max_name_len = 0;
     size_t max_type_len = 0;
 
     // Record all (collection name, value type name) pairs
     // Record the maximum length of both strings so that we can print nicely aligned columns.
     for (const std::string& name : frame->getAvailableCollections()) {
         const podio::CollectionBase* coll = frame->get(name);
         const auto type = coll->getTypeName();
         max_name_len = std::max(max_name_len, name.length());
         max_type_len = std::max(max_type_len, type.length());
         collectionNames[name] = std::string(type);
     }
 
     // Print table
     std::cout << std::endl;
     std::cout << "Available Collections" << std::endl;
     std::cout << std::endl;
     std::cout << "Collection Name" << std::string(max_name_len + 2 - std::string("Collection Name").length(), ' ')
               << "Data Type" << std::endl;
     std::cout << std::string(max_name_len, '-') << "  " << std::string(max_name_len, '-') << std::endl;
     for (auto &[name, type] : collectionNames) {
         std::cout << name + std::string(max_name_len + 2 - name.length(), ' ');
         std::cout << type << std::endl;
     }
     std::cout << std::endl;
 
 }

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