HepMC3 event record library
WriterAsciiHepMC2.h
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1 // -*- C++ -*-
2 //
3 // This file is part of HepMC
4 // Copyright (C) 2014-2020 The HepMC collaboration (see AUTHORS for details)
5 //
6 #ifndef HEPMC3_WRITERASCIIHEPMC2_H
7 #define HEPMC3_WRITERASCIIHEPMC2_H
8 ///
9 /// @file WriterAsciiHepMC2.h
10 /// @brief Definition of class \b WriterAsciiHepMC2
11 ///
12 /// @class HepMC3::WriterAsciiHepMC2
13 /// @brief GenEvent I/O serialization for structured text files
14 ///
15 /// @ingroup IO
16 ///
17 #include "HepMC3/Writer.h"
18 #include "HepMC3/GenEvent.h"
19 #include "HepMC3/GenRunInfo.h"
20 #include <string>
21 #include <fstream>
22 
23 namespace HepMC3
24 {
25 
26 class WriterAsciiHepMC2 : public Writer
27 {
28 public:
29 
30  /// @brief Constructor
31  /// @warning If file already exists, it will be cleared before writing
32  WriterAsciiHepMC2(const std::string& filename,
33  std::shared_ptr<GenRunInfo> run = std::shared_ptr<GenRunInfo>());
34 
35  /// @brief Constructor from ostream
36  WriterAsciiHepMC2(std::ostream& stream,
37  std::shared_ptr<GenRunInfo> run = std::shared_ptr<GenRunInfo>());
38  /// @brief Destructor
40 
41  /// @brief Write event to file
42  ///
43  /// @param[in] evt Event to be serialized
44  void write_event(const GenEvent& evt) override;
45 
46  /// @brief Write the GenRunInfo object to file.
47  void write_run_info();
48 
49  /// @brief Return status of the stream
50  bool failed() override;
51 
52  /// @brief Close file stream
53  void close() override;
54 
55  /// @brief Set output precision
56  ///
57  /// Available range is [2,24]. Default is 16.
58  void set_precision( const int& prec );
59 
60  /// @brief Return output precision
61  int precision() const;
62 private:
63 
64  /// @name Buffer management
65  //@{
66 
67  /// @brief Attempts to allocate buffer of the chosen size
68  ///
69  /// This function can be called manually by the user or will be called
70  /// before first read/write operation
71  ///
72  /// @note If buffer size is too large it will be divided by 2 until it is
73  /// small enough for system to allocate
74  void allocate_buffer();
75 
76  /// @brief Set buffer size (in bytes)
77  ///
78  /// Default is 256kb. Minimum is 256b.
79  /// Size can only be changed before first read/write operation.
80  void set_buffer_size(const size_t& size );
81 
82  /// @brief Escape '\' and '\n' characters in string
83  std::string escape(const std::string& s) const;
84 
85  /// Inline function flushing buffer to output stream when close to buffer capacity
86  void flush();
87 
88  /// Inline function forcing flush to the output stream
89  void forced_flush();
90 
91  //@}
92 
93 
94  /// @name Write helpers
95  //@{
96 
97  /// @brief Inline function for writing strings
98  ///
99  /// Since strings can be long (maybe even longer than buffer) they have to be dealt
100  /// with separately.
101  void write_string(const std::string &str );
102 
103  /// @brief Write vertex
104  ///
105  /// Helper routine for writing single vertex to file
106  void write_vertex(ConstGenVertexPtr v);
107 
108  /// @brief Write particle
109  ///
110  /// Helper routine for writing single particle to file
111  void write_particle(ConstGenParticlePtr p, int second_field);
112 
113  //@}
114 
115 private:
116 
117  std::ofstream m_file; //!< Output file
118  std::ostream* m_stream; //!< Output stream
119  int m_precision; //!< Output precision
120  char* m_buffer; //!< Stream buffer
121  char* m_cursor; //!< Cursor inside stream buffer
122  unsigned long m_buffer_size; //!< Buffer size
123  unsigned long m_particle_counter; //!< Used to set bar codes
124 
125 };
126 
127 
128 } // namespace HepMC3
129 
130 #endif
GenEvent I/O serialization for structured text files.
Definition of class GenRunInfo.
void close() override
Close file stream.
std::ofstream m_file
Output file.
WriterAsciiHepMC2(const std::string &filename, std::shared_ptr< GenRunInfo > run=std::shared_ptr< GenRunInfo >())
Constructor.
void write_event(const GenEvent &evt) override
Write event to file.
void forced_flush()
Inline function forcing flush to the output stream.
void write_vertex(ConstGenVertexPtr v)
Write vertex.
int precision() const
Return output precision.
char * m_buffer
Stream buffer.
char * m_cursor
Cursor inside stream buffer.
unsigned long m_buffer_size
Buffer size.
unsigned long m_particle_counter
Used to set bar codes.
Definition: pytypes.h:935
Stores event-related information.
Definition: GenEvent.h:41
void allocate_buffer()
Attempts to allocate buffer of the chosen size.
void write_string(const std::string &str)
Inline function for writing strings.
Definition of interface Writer.
bool failed() override
Return status of the stream.
void write_run_info()
Write the GenRunInfo object to file.
void set_buffer_size(const size_t &size)
Set buffer size (in bytes)
void write_particle(ConstGenParticlePtr p, int second_field)
Write particle.
void flush()
Inline function flushing buffer to output stream when close to buffer capacity.
std::string escape(const std::string &s) const
Escape &#39;\&#39; and &#39; &#39; characters in string.
Base class for all I/O writers.
Definition: Writer.h:25
int m_precision
Output precision.
Definition of class GenEvent.
void set_precision(const int &prec)
Set output precision.
std::ostream * m_stream
Output stream.