UniRec 3.3.2
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unirecRecordView.hpp
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1
14#pragma once
15
16#include "unirecArray.hpp"
17#include "unirecTypeTraits.hpp"
18#include "unirecTypes.hpp"
19
20#include <cstddef>
21#include <exception>
22#include <numeric>
23#include <string>
24#include <type_traits>
25#include <unirec/unirec.h>
26
27namespace Nemea {
28
29class UnirecRecord;
30
41public:
48 UnirecRecordView(const void* unirecRecordData, ur_template_t* unirecTemplate, uint64_t sequenceNumber = 0)
49 : m_recordData(unirecRecordData)
50 , m_unirecTemplate(unirecTemplate)
51 , m_sequenceNumber(sequenceNumber)
52 {
53 }
54
60 const void* data() const noexcept { return m_recordData; }
61
67 size_t size() const noexcept { return ur_rec_size(m_unirecTemplate, m_recordData); }
68
83 uint64_t getSequenceNumber() const noexcept
84 {
85 return m_sequenceNumber;
86 }
87
116 template <typename T>
118 {
119 using BaseType = typename std::remove_cv_t<
120 typename std::remove_pointer_t<typename std::remove_reference_t<T>>>;
121 using RequiredType = typename std::conditional_t<is_string_v<BaseType>, T, BaseType>;
122
123 if (getExpectedUnirecType<RequiredType>() != ur_get_type(fieldID)) {
124 throw std::runtime_error(
125 "UnirecRecord data type format mismatch: " + std::string(typeid(T).name()));
126 }
127
128 if constexpr (is_string_v<T>) {
129 return {
130 static_cast<const char*>(ur_get_ptr_by_id(m_unirecTemplate, m_recordData, fieldID)),
132 };
133 } else if constexpr (std::is_pointer_v<T>) {
134 return static_cast<T>(ur_get_ptr_by_id(m_unirecTemplate, m_recordData, fieldID));
135 } else if constexpr (std::is_reference_v<T>) {
136 return *reinterpret_cast<BaseType*>(
138 } else {
139 return *static_cast<T*>(ur_get_ptr_by_id(m_unirecTemplate, m_recordData, fieldID));
140 }
141 }
142
158 template <typename T>
160 {
161 return UnirecArray<T>(
162 static_cast<T*>(ur_get_ptr_by_id(m_unirecTemplate, m_recordData, fieldID)),
164 fieldID);
165 }
166
167private:
168 template <typename T>
170 {
171 return T(
172 static_cast<const char*>(ur_get_ptr_by_id(m_unirecTemplate, m_recordData, fieldID)),
174 }
175
176 const void* m_recordData;
179
180 friend class UnirecRecord;
181};
182
183} // namespace Nemea
A wrapper class for a contiguous array of values with the same unirec fieldID.
Provides a view into a UniRec record.
add_const_t< T > getFieldAsStringType(ur_field_id_t fieldID) const
uint64_t getSequenceNumber() const noexcept
Gets the sequence number of the record.
size_t size() const noexcept
Returns the size of the UniRec record.
UnirecRecordView(const void *unirecRecordData, ur_template_t *unirecTemplate, uint64_t sequenceNumber=0)
Constructs a UnirecRecordView object.
const void * data() const noexcept
Returns a const pointer to the data of the UniRec record.
add_const_t< T > getFieldAsType(ur_field_id_t fieldID) const
Gets the value of a field as a type T.
add_const_t< UnirecArray< T > > getFieldAsUnirecArray(ur_field_id_t fieldID) const
Gets the value of a field as a UnirecArray.
A class for working with UniRec records and their fields.
#define ur_rec_size(tmplt, rec)
Get size of UniRec record (static and variable length) Get total size of whole UniRec record.
Definition unirec.h:680
#define ur_get_var_len(tmplt, rec, field_id)
Get size of a variable sized field in the record. Get size of a variable-length field in the record....
Definition unirec.h:474
#define ur_array_get_elem_cnt(tmplt, rec, field_id)
Get number of elements stored in an UniRec array.
Definition unirec.h:546
#define ur_get_type(field_id)
Get type of UniRec field Get type of any UniRec defined field.
Definition unirec.h:388
#define ur_get_ptr_by_id(tmplt, data, field_id)
Get pointer to UniRec field Get pointer to fixed or varible length UniRec field. In contrast to ur_ge...
Definition unirec.h:442
typename add_const< T >::type add_const_t
Header file containing the definition of the UnirecArray class and its Iterator subclass.
Provides a set of type traits and aliases for working with unirec++.
This file contains functions for determining the expected UniRec type for various C++ types.
Definition of UniRec structures and functions.
int16_t ur_field_id_t
Type of UniRec field identifiers.
Definition unirec.h:136
UniRec template. It contains a table mapping a field to its position in an UniRec record.
Definition unirec.h:191