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 */
12#include "HepMC3/Units.h"
13#include "HepMC3/Version.h"
14namespace HepMC3
15{
16HEPMC3_DECLARE_READER_FILE(ReaderRootTree)
17
18ReaderRootTree::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
26ReaderRootTree::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_ERROR( "ReaderRootTree2: problem reading branch tree: " << "GenRunInfo")
60 return false;
61 }
62 set_run_info(std::make_shared<GenRunInfo>());
63 return true;
64}
65
66bool ReaderRootTree::skip(const int n)
67{
69 if (m_events_count>m_tree->GetEntries()) return false;
70 return true;
71}
72
73
74
76{
77 if (m_events_count>m_tree->GetEntries()) return false;
78 m_event_data->particles.clear();
79 m_event_data->vertices.clear();
80 m_event_data->links1.clear();
81 m_event_data->links2.clear();
85
86
93
94
95 m_tree->GetEntry(m_events_count);
97 run_info()->read_data(*m_run_info_data);
100 return true;
101}
102
104{
105 m_file->Close();
106}
107
109{
110 if ( !m_file->IsOpen() ) return true;
111 if (m_events_count>m_tree->GetEntries()) return true;
112 return false;
113}
114
115} // namespace HepMC3
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:23
Definition of class ReaderRootTree.
Definition of class Units.
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
GenEvent I/O parsing and serialization for root files based on root TTree.
bool read_event(GenEvent &evt) override
Read event from file.
TTree * m_tree
Tree handler. Public to allow simple access, e.g. custom branches.
ReaderRootTree(const std::string &filename)
Default constructor.
bool failed() override
Get file error state.
bool skip(const int) override
skip events
GenEventData * m_event_data
Pointer to structure that holds event data.
int m_events_count
Events count. Needed to read the tree.
void close() override
Close file.
std::string m_tree_name
Name of TTree.
std::string m_branch_name
Name of TBranch in TTree.
TFile * m_file
File handler.
GenRunInfoData * m_run_info_data
Pointer to structure that holds run info data.
bool init()
init routine
std::shared_ptr< GenRunInfo > run_info() const
Get the global GenRunInfo object.
Definition: Reader.h:44
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the global GenRunInfo object.
Definition: Reader.h:64
HepMC3 main namespace.
Stores serializable event information.
Definition: GenEventData.h:26
std::vector< GenVertexData > vertices
Vertices.
Definition: GenEventData.h:32
std::vector< int > links2
Second id of the vertex links.
Definition: GenEventData.h:52
std::vector< std::string > attribute_string
Attribute serialized as string.
Definition: GenEventData.h:56
std::vector< GenParticleData > particles
Particles.
Definition: GenEventData.h:31
std::vector< int > links1
First id of the vertex links.
Definition: GenEventData.h:51
std::vector< std::string > attribute_name
Attribute name.
Definition: GenEventData.h:55
std::vector< int > attribute_id
Attribute owner id.
Definition: GenEventData.h:54
Stores serializable run information.
std::vector< std::string > tool_name
Tool names.
std::vector< std::string > tool_version
Tool versions.
std::vector< std::string > attribute_string
Attribute serialized as string.
std::vector< std::string > attribute_name
Attribute name.
std::vector< std::string > tool_description
Tool descriptions.
std::vector< std::string > weight_names
Weight names.