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
19 m_file = TFile::Open(filename.c_str());
20 m_next = new TIter(m_file->GetListOfKeys());
21
22 if ( !m_file->IsOpen() ) {
23 HEPMC3_ERROR( "ReaderRoot: problem opening file: " << filename )
24 return;
25 }
26
27 std::shared_ptr<GenRunInfo> ri = std::make_shared<GenRunInfo>();
28
29 GenRunInfoData *run = reinterpret_cast<GenRunInfoData*>(m_file->Get("GenRunInfoData"));
30
31 if(run) {
32 ri->read_data(*run);
33 delete run;
34 }
35
36 set_run_info(ri);
37}
38
39bool ReaderRoot::skip(const int n)
40{
41 GenEvent evt;
42 for (int nn=n; nn>0; --nn)
43 {
44 if (!read_event(evt)) return false;
45 evt.clear();
46 }
47 return !failed();
48}
49
51
52 // Skip object of different type than GenEventData
53 GenEventData *data = nullptr;
54
55 while(true) {
56 TKey *key = (TKey*) (*m_next)();
57
58 if( !key ) {
59 m_file->Close();
60 return false;
61 }
62
63 const char *cl = key->GetClassName();
64
65 if( !cl ) continue;
66 size_t geneventdata30=strncmp(cl,"HepMC::GenEventData",19);
67 size_t geneventdata31=strncmp(cl,"HepMC3::GenEventData",20);
68 if( geneventdata31==0 || geneventdata30==0 ) {
69 if (geneventdata30==0) HEPMC3_WARNING( "ReaderRoot::read_event: The object was written with HepMC3 version 3.0" )
70 data = reinterpret_cast<GenEventData*>(key->ReadObj());
71 break;
72 }
73 }
74
75 if( !data ) {
76 HEPMC3_ERROR("ReaderRoot: could not read event from root file")
77 m_file->Close();
78 return false;
79 }
80
81 evt.read_data(*data);
82 evt.set_run_info( run_info() );
83
84 delete data;
85 return true;
86}
87
89 m_file->Close();
90}
91
93 if ( !m_file->IsOpen() ) return true;
94
95 return false;
96}
97
98} // namespace HepMC3
#define HEPMC3_WARNING(MESSAGE)
Macro for printing HEPMC3_HEPMC3_WARNING messages.
Definition: Errors.h:26
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:23
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:128
void read_data(const GenEventData &data)
Fill GenEvent based on GenEventData.
Definition: GenEvent.cc:703
void clear()
Remove contents of this event.
Definition: GenEvent.cc:608
GenEvent I/O parsing and serialization for root files.
Definition: ReaderRoot.h:32
bool read_event(GenEvent &evt) override
Read event from file.
Definition: ReaderRoot.cc:50
bool failed() override
Get stream error state.
Definition: ReaderRoot.cc:92
bool skip(const int) override
skip events
Definition: ReaderRoot.cc:39
void close() override
Close file stream.
Definition: ReaderRoot.cc:88
TFile * m_file
File handler.
Definition: ReaderRoot.h:62
TIter * m_next
Iterator for event reading.
Definition: ReaderRoot.h:63
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.