Json_diff_vector Class Reference

Vector of logical diffs describing changes to a JSON column. More...

#include <json_diff.h>

Public Types
typedef Mem_root_allocator< Json_diff >	allocator_type
	Type of the allocator for the underlying invector. More...
typedef std::vector< Json_diff, allocator_type >	vector
	Type of the underlying vector. More...
typedef vector::iterator	iterator
	Type of iterator over the underlying vector. More...
typedef vector::const_iterator	const_iterator
	Type of iterator over the underlying vector. More...

Public Member Functions
	Json_diff_vector (allocator_type arg)
	Constructor. More...
void	add_diff (const Json_seekable_path &path, enum_json_diff_operation operation, std::unique_ptr< Json_dom > dom)
	Append a new diff at the end of this vector. More...
void	add_diff (const Json_seekable_path &path, enum_json_diff_operation operation)
	Append a new diff at the end of this vector when operation == REMOVE. More...
void	clear ()
	Clear the vector. More...
size_t	size () const
	Return the number of elements in the vector. More...
Json_diff &	at (size_t pos)
	Return the element at the given position. More...
const_iterator	begin () const
const_iterator	end () const
size_t	binary_length (bool include_metadata=true) const
	Return the length of the binary representation of this Json_diff_vector. More...
bool	write_binary (String *to) const
	Serialize this Json_diff_vector into the given String. More...
bool	read_binary (const char **from, const struct TABLE *table, const char *field_name)
	De-serialize Json_diff objects from the given String into this Json_diff_vector. More...

Static Public Attributes
static const Json_diff_vector	EMPTY_JSON_DIFF_VECTOR
	An empty diff vector (having no diffs). More...

Private Attributes
vector	m_vector
size_t	m_binary_length
	Length in bytes of the binary representation, not counting the 4 bytes length. More...

Static Private Attributes
static const size_t	ENCODED_LENGTH_BYTES = 4
	The length of the field where the total length is encoded. More...

Detailed Description

Vector of logical diffs describing changes to a JSON column.

Member Typedef Documentation

allocator_type

typedef Mem_root_allocator<Json_diff> Json_diff_vector::allocator_type

Type of the allocator for the underlying invector.

const_iterator

typedef vector::const_iterator Json_diff_vector::const_iterator

Type of iterator over the underlying vector.

iterator

typedef vector::iterator Json_diff_vector::iterator

Type of iterator over the underlying vector.

vector

typedef std::vector<Json_diff, allocator_type> Json_diff_vector::vector

Type of the underlying vector.

Constructor & Destructor Documentation

Json_diff_vector()

Json_diff_vector::Json_diff_vector ( allocator_type  arg )

explicit

Constructor.

Parameters

arg	Mem_root_allocator to use for the vector

Member Function Documentation

add_diff() [1/2]

void Json_diff_vector::add_diff	(	const Json_seekable_path &	path,
		enum_json_diff_operation	operation
	)

Append a new diff at the end of this vector when operation == REMOVE.

Parameters

path	Path to update
operation	Operation

add_diff() [2/2]

void Json_diff_vector::add_diff	(	const Json_seekable_path &	path,
		enum_json_diff_operation	operation,
		std::unique_ptr< Json_dom >	dom
	)

Append a new diff at the end of this vector.

Parameters

path	Path to update
operation	Operation
dom	New value to insert

at()

Json_diff & Json_diff_vector::at ( size_t  pos )

inline

Return the element at the given position.

Parameters

pos

Position

Returns

the pos'th element

begin()

const_iterator Json_diff_vector::begin ( void  ) const

inline

binary_length()

size_t Json_diff_vector::binary_length

(

bool

include_metadata = true

)

const

Return the length of the binary representation of this Json_diff_vector.

The binary format has this form:

+--------+--------+--------+     +--------+
| length | diff_1 | diff_2 | ... | diff_N |
+--------+--------+--------+     +--------+

This function returns the length of only the diffs, if include_metadata==false. It returns the length of the 'length' field plus the length of the diffs, if include_metadata=true. The value of the 'length' field is exactly the return value from this function when include_metadata=false.

Parameters

include_metadata

if true, include the length of the length field in the computation, otherwise don't.

Returns

The computed length

clear()

void Json_diff_vector::clear

(

)

Clear the vector.

end()

const_iterator Json_diff_vector::end ( void  ) const

inline

read_binary()

bool Json_diff_vector::read_binary	(	const char **	from,
		const struct TABLE *	table,
		const char *	field_name
	)

De-serialize Json_diff objects from the given String into this Json_diff_vector.

Parameters

[in,out]	from	Pointer to buffer to read from. The function will move this to point to the next byte to read after those that were read.
[in]	table	Table structure (used for error messages).
[in]	field_name	Field name (used for error messages).

Return values

false	Success
true	Failure (bad format or out of memory)

size()

size_t Json_diff_vector::size ( ) const

inline

Return the number of elements in the vector.

write_binary()

bool Json_diff_vector::write_binary

(

String *

to

)

const

Serialize this Json_diff_vector into the given String.

Parameters

to	String to which the vector will be appended

Return values

false	Success
true	Failure (out of memory)

Member Data Documentation

EMPTY_JSON_DIFF_VECTOR

const Json_diff_vector Json_diff_vector::EMPTY_JSON_DIFF_VECTOR

static

Initial value:

{
    Json_diff_vector::allocator_type{&empty_json_diff_vector_mem_root}}

An empty diff vector (having no diffs).

ENCODED_LENGTH_BYTES

const size_t Json_diff_vector::ENCODED_LENGTH_BYTES = 4

staticprivate

The length of the field where the total length is encoded.

m_binary_length

size_t Json_diff_vector::m_binary_length

private

Length in bytes of the binary representation, not counting the 4 bytes length.

m_vector

vector Json_diff_vector::m_vector

private

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The documentation for this class was generated from the following files:

• sql/json_diff.h
• sql/json_diff.cc