1 | // -*- C++ -*-
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2 | //
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3 | // This file is part of HepMC
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4 | // Copyright (C) 2014-2019 The HepMC collaboration (see AUTHORS for details)
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5 | //
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6 | /**
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7 | * @file ReaderRoot.cc
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8 | * @brief Implementation of \b class ReaderRoot
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9 | *
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10 | */
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11 | #include "HepMC3/ReaderRoot.h"
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12 | #include "HepMC3/Version.h"
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13 |
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14 | namespace HepMC3 {
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15 | HEPMC3_DECLARE_READER_FILE(ReaderRoot)
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16 |
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17 | ReaderRoot::ReaderRoot(const std::string &filename) {
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18 | m_file = TFile::Open(filename.c_str());
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19 | m_next = new TIter(m_file->GetListOfKeys());
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20 |
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21 | if ( !m_file->IsOpen() ) {
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22 | HEPMC3_ERROR("ReaderRoot: problem opening file: " << filename)
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23 | return;
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24 | }
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25 |
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26 | std::shared_ptr<GenRunInfo> ri = std::make_shared<GenRunInfo>();
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27 |
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28 | GenRunInfoData *run = reinterpret_cast<GenRunInfoData*>(m_file->Get("GenRunInfoData"));
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29 |
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30 | if (run) {
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31 | ri->read_data(*run);
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32 | delete run;
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33 | }
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34 |
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35 | set_run_info(ri);
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36 | }
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37 |
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38 | bool ReaderRoot::skip(const int n)
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39 | {
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40 | GenEvent evt;
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41 | for (int nn = n; nn > 0; --nn)
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42 | {
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43 | if (!read_event(evt)) return false;
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44 | evt.clear();
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45 | }
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46 | return !failed();
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47 | }
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48 |
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49 | bool ReaderRoot::read_event(GenEvent& evt) {
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50 | // Skip object of different type than GenEventData
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51 | GenEventData *data = nullptr;
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52 |
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53 | while (true) {
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54 | TKey *key = (TKey*) (*m_next)();
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55 |
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56 | if ( !key ) {
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57 | m_file->Close();
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58 | return false;
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59 | }
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60 |
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61 | const char *cl = key->GetClassName();
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62 |
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63 | if ( !cl ) continue;
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64 | size_t geneventdata30 = strncmp(cl, "HepMC::GenEventData", 19);
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65 | size_t geneventdata31 = strncmp(cl, "HepMC3::GenEventData", 20);
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66 | if ( geneventdata31 == 0 || geneventdata30 == 0 ) {
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67 | if (geneventdata30 == 0) HEPMC3_WARNING("ReaderRoot::read_event: The object was written with HepMC3 version 3.0")
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68 | data = reinterpret_cast<GenEventData*>(key->ReadObj());
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69 | break;
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70 | }
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71 | }
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72 |
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73 | if ( !data ) {
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74 | HEPMC3_ERROR("ReaderRoot: could not read event from root file")
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75 | m_file->Close();
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76 | return false;
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77 | }
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78 |
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79 | evt.read_data(*data);
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80 | evt.set_run_info(run_info());
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81 |
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82 | delete data;
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83 | return true;
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84 | }
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85 |
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86 | void ReaderRoot::close() {
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87 | m_file->Close();
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88 | }
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89 |
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90 | bool ReaderRoot::failed() {
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91 | if ( !m_file->IsOpen() ) return true;
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92 |
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93 | return false;
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94 | }
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95 |
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96 | } // namespace HepMC3
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