HepMC3 event record library
ReaderRootTree.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 ReaderRootTree.cc
8  * @brief Implementation of \b class ReaderRootTree
9  *
10  */
11 #include "HepMC3/ReaderRootTree.h"
12 #include "HepMC3/Units.h"
13 #include "HepMC3/Version.h"
14 namespace HepMC3
15 {
16 HEPMC3_DECLARE_READER_FILE(ReaderRootTree)
17 
18 ReaderRootTree::ReaderRootTree(const std::string &filename):
19  m_tree(0),m_events_count(0),m_tree_name("hepmc3_tree"),m_branch_name("hepmc3_event")
20 {
21  m_file = TFile::Open(filename.c_str());
22  if (!init()) return;
23 }
24 
25 
26 ReaderRootTree::ReaderRootTree(const std::string &filename,const std::string &treename,const std::string &branchname):
27  m_tree(0),m_events_count(0),m_tree_name(treename.c_str()),m_branch_name(branchname.c_str())
28 {
29  m_file = TFile::Open(filename.c_str());
30  if (!init()) return;
31 }
32 
34 {
35  if ( !m_file->IsOpen() )
36  {
37  HEPMC3_ERROR( "ReaderRootTree: problem opening file: " << m_file->GetName() )
38  return false;
39  }
40 
41 
42  m_tree=reinterpret_cast<TTree*>(m_file->Get(m_tree_name.c_str()));
43  if (!m_tree)
44  {
45  HEPMC3_ERROR( "ReaderRootTree: problem opening tree: " << m_tree_name)
46  return false;
47  }
49  int result=m_tree->SetBranchAddress(m_branch_name.c_str(),&m_event_data);
50  if (result<0)
51  {
52  HEPMC3_ERROR( "ReaderRootTree: problem reading branch tree: " << m_tree_name)
53  return false;
54  }
56  result=m_tree->SetBranchAddress("GenRunInfo",&m_run_info_data);
57  if (result<0)
58  {
59  HEPMC3_WARNING( "ReaderRootTree: problem reading branch tree: GenRunInfo. Will attempt to read GenRunInfoData object.")
60  std::shared_ptr<GenRunInfo> ri = std::make_shared<GenRunInfo>();
61  GenRunInfoData *run = reinterpret_cast<GenRunInfoData*>(m_file->Get("GenRunInfoData"));
62  if(run) {
63  ri->read_data(*run);
64  delete run;
65  set_run_info(ri);
66  HEPMC3_WARNING( "ReaderRootTree::init The object was written with HepMC3 version 3.0" )
67  } else {
68  HEPMC3_ERROR( "ReaderRootTree: problem reading object GenRunInfoData")
69  return false;
70  }
71  }
72  set_run_info(std::make_shared<GenRunInfo>());
73  return true;
74 }
75 
76 bool ReaderRootTree::skip(const int n)
77 {
78  m_events_count+=n;
79  if (m_events_count>m_tree->GetEntries()) return false;
80  return true;
81 }
82 
83 
84 
86 {
87  if (m_events_count>m_tree->GetEntries()) return false;
88  m_event_data->particles.clear();
89  m_event_data->vertices.clear();
90  m_event_data->links1.clear();
91  m_event_data->links2.clear();
92  m_event_data->attribute_id.clear();
95 
96 
98  m_run_info_data->tool_name.clear();
103 
104 
105  m_tree->GetEntry(m_events_count);
106  evt.read_data(*m_event_data);
107  run_info()->read_data(*m_run_info_data);
108  evt.set_run_info(run_info());
109  m_events_count++;
110  return true;
111 }
112 
114 {
115  m_file->Close();
116 }
117 
119 {
120  if ( !m_file->IsOpen() ) return true;
121  if (m_events_count>m_tree->GetEntries()) return true;
122  return false;
123 }
124 
125 } // namespace HepMC3
#define HEPMC3_WARNING(MESSAGE)
Macro for printing HEPMC3_HEPMC3_WARNING messages.
Definition: Errors.h:26
std::vector< int > attribute_id
Attribute owner id.
Definition: GenEventData.h:54
std::vector< std::string > attribute_name
Attribute name.
std::vector< int > links2
Second id of the vertex links.
Definition: GenEventData.h:52
Definition of class ReaderRootTree.
GenRunInfoData * m_run_info_data
Pointer to structure that holds run info data.
TTree * m_tree
Tree handler. Public to allow simple access, e.g. custom branches.
TFile * m_file
File handler.
std::vector< int > links1
First id of the vertex links.
Definition: GenEventData.h:51
bool skip(const int) override
skip events
std::vector< std::string > attribute_string
Attribute serialized as string.
Definition: GenEventData.h:56
bool init()
init routine
Stores event-related information.
Definition: GenEvent.h:41
Stores serializable event information.
Definition: GenEventData.h:26
std::vector< std::string > attribute_string
Attribute serialized as string.
std::vector< std::string > tool_name
Tool names.
std::vector< std::string > attribute_name
Attribute name.
Definition: GenEventData.h:55
Stores serializable run information.
std::shared_ptr< GenRunInfo > run_info() const
Get the global GenRunInfo object.
Definition: Reader.h:44
int m_events_count
Events count. Needed to read the tree.
void close() override
Close file.
std::string m_tree_name
Name of TTree.
void read_data(const GenEventData &data)
Fill GenEvent based on GenEventData.
Definition: GenEvent.cc:703
Definition of class Units.
std::vector< GenParticleData > particles
Particles.
Definition: GenEventData.h:31
GenEvent I/O parsing and serialization for root files based on root TTree.
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the GenRunInfo object by smart pointer.
Definition: GenEvent.h:128
bool read_event(GenEvent &evt) override
Read event from file.
bool failed() override
Get file error state.
std::vector< GenVertexData > vertices
Vertices.
Definition: GenEventData.h:32
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the global GenRunInfo object.
Definition: Reader.h:64
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:23
std::vector< std::string > tool_version
Tool versions.
GenEventData * m_event_data
Pointer to structure that holds event data.
std::string m_branch_name
Name of TBranch in TTree.
std::vector< std::string > weight_names
Weight names.
std::vector< std::string > tool_description
Tool descriptions.
ReaderRootTree(const std::string &filename)
Default constructor.