HepMC3 event record library
ReaderRoot.cc
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1// -*- C++ -*-
2//
3// This file is part of HepMC
4// Copyright (C) 2014-2019 The HepMC collaboration (see AUTHORS for details)
5//
6/**
7 * @file ReaderRoot.cc
8 * @brief Implementation of \b class ReaderRoot
9 *
10 */
11#include "HepMC3/ReaderRoot.h"
12#include "HepMC3/Version.h"
13
14namespace HepMC3 {
15HEPMC3_DECLARE_READER_FILE(ReaderRoot)
16
17ReaderRoot::ReaderRoot(const std::string &filename) {
18 m_file = TFile::Open(filename.c_str());
19 m_next = new TIter(m_file->GetListOfKeys());
20
21 if ( !m_file->IsOpen() ) {
22 HEPMC3_ERROR("ReaderRoot: problem opening file: " << filename)
23 return;
24 }
25
26 std::shared_ptr<GenRunInfo> ri = std::make_shared<GenRunInfo>();
27
28 GenRunInfoData *run = reinterpret_cast<GenRunInfoData*>(m_file->Get("GenRunInfoData"));
29
30 if (run) {
31 ri->read_data(*run);
32 delete run;
33 }
34
35 set_run_info(ri);
36}
37
38bool ReaderRoot::skip(const int n)
39{
40 GenEvent evt;
41 for (int nn = n; nn > 0; --nn)
42 {
43 if (!read_event(evt)) return false;
44 evt.clear();
45 }
46 return !failed();
47}
48
50 // Skip object of different type than GenEventData
51 GenEventData *data = nullptr;
52
53 while (true) {
54 TKey *key = (TKey*) (*m_next)();
55
56 if ( !key ) {
57 m_file->Close();
58 return false;
59 }
60
61 const char *cl = key->GetClassName();
62
63 if ( !cl ) continue;
64 size_t geneventdata30 = strncmp(cl, "HepMC::GenEventData", 19);
65 size_t geneventdata31 = strncmp(cl, "HepMC3::GenEventData", 20);
66 if ( geneventdata31 == 0 || geneventdata30 == 0 ) {
67 if (geneventdata30 == 0) HEPMC3_WARNING("ReaderRoot::read_event: The object was written with HepMC3 version 3.0")
68 data = reinterpret_cast<GenEventData*>(key->ReadObj());
69 break;
70 }
71 }
72
73 if ( !data ) {
74 HEPMC3_ERROR("ReaderRoot: could not read event from root file")
75 m_file->Close();
76 return false;
77 }
78
79 evt.read_data(*data);
81
82 delete data;
83 return true;
84}
85
87 m_file->Close();
88}
89
91 if ( !m_file->IsOpen() ) return true;
92
93 return false;
94}
95
96} // namespace HepMC3
#define HEPMC3_WARNING(MESSAGE)
Macro for printing HEPMC3_HEPMC3_WARNING messages.
Definition: Errors.h:27
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:24
Definition of class ReaderRoot.
Stores event-related information.
Definition: GenEvent.h:41
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the GenRunInfo object by smart pointer.
Definition: GenEvent.h:141
void read_data(const GenEventData &data)
Fill GenEvent based on GenEventData.
Definition: GenEvent.cc:690
void clear()
Remove contents of this event.
Definition: GenEvent.cc:599
GenEvent I/O parsing and serialization for root files.
Definition: ReaderRoot.h:33
bool read_event(GenEvent &evt) override
Read event from file.
Definition: ReaderRoot.cc:49
bool failed() override
Get stream error state.
Definition: ReaderRoot.cc:90
bool skip(const int) override
skip events
Definition: ReaderRoot.cc:38
void close() override
Close file stream.
Definition: ReaderRoot.cc:86
TFile * m_file
File handler.
Definition: ReaderRoot.h:63
TIter * m_next
Iterator for event reading.
Definition: ReaderRoot.h:64
std::shared_ptr< GenRunInfo > run_info() const
Get the global GenRunInfo object.
Definition: Reader.h:44
HepMC3 main namespace.
Stores serializable event information.
Definition: GenEventData.h:26
Stores serializable run information.