Chert::PostlistChunkWriter Class Reference

PostlistChunkWriter is a wrapper which acts roughly as an output iterator on a postlist chunk, taking care of the messy details. More...

Collaboration diagram for Chert::PostlistChunkWriter:

Public Member Functions
	PostlistChunkWriter (const string &orig_key_, bool is_first_chunk_, const string &tname_, bool is_last_chunk_)
void	append (ChertTable *table, Xapian::docid did, Xapian::termcount wdf)
	Append an entry to this chunk. More...
void	raw_append (Xapian::docid first_did_, Xapian::docid current_did_, const string &s)
	Append a block of raw entries to this chunk. More...
void	flush (ChertTable *table)
	Flush the chunk to the buffered table. More...

Private Attributes
string	orig_key
string	tname
bool	is_first_chunk
bool	is_last_chunk
bool	started
Xapian::docid	first_did
Xapian::docid	current_did
string	chunk

Detailed Description

PostlistChunkWriter is a wrapper which acts roughly as an output iterator on a postlist chunk, taking care of the messy details.

It's intended to be used with deletion and replacing of entries, not for adding to the end, when it's not really needed.

Definition at line 93 of file chert_postlist.cc.

Constructor & Destructor Documentation

PostlistChunkWriter()

PostlistChunkWriter::PostlistChunkWriter	(	const string &	orig_key_,
		bool	is_first_chunk_,
		const string &	tname_,
		bool	is_last_chunk_
	)

Definition at line 305 of file chert_postlist.cc.

References LOGCALL_CTOR.

Member Function Documentation

append()

void PostlistChunkWriter::append	(	ChertTable *	table,
		Xapian::docid	did,
		Xapian::termcount	wdf
	)

Append an entry to this chunk.

Definition at line 318 of file chert_postlist.cc.

References Assert, chunk, CHUNKSIZE, current_did, first_did, flush(), is_first_chunk, is_last_chunk, ChertPostListTable::make_key(), orig_key, pack_uint(), started, and tname.

Referenced by ChertPostListTable::merge_changes().

flush()

void PostlistChunkWriter::flush

(

ChertTable *

table

)

Flush the chunk to the buffered table.

Note: this may write it with a different key to the original one, if for example the first entry has changed.

Definition at line 389 of file chert_postlist.cc.

References ChertTable::add(), Assert, C_unpack_uint_preserving_sort(), check_tname_in_key(), chunk, current_did, ChertTable::cursor_get(), ChertTable::del(), first_did, ChertTable::get_exact_entry(), is_first_chunk, is_last_chunk, LOGCALL_VOID, LOGLINE, ChertPostListTable::make_key(), make_start_of_chunk(), make_start_of_first_chunk(), orig_key, read_start_of_chunk(), read_start_of_first_chunk(), report_read_error(), started, tname, and write_start_of_chunk().

Referenced by append(), and ChertPostListTable::merge_changes().

raw_append()

void Chert::PostlistChunkWriter::raw_append ( Xapian::docid  first_did_, Xapian::docid  current_did_, const string &  s  )

inline

Append a block of raw entries to this chunk.

Definition at line 105 of file chert_postlist.cc.

References Assert.

Member Data Documentation

chunk

string Chert::PostlistChunkWriter::chunk

private

Definition at line 132 of file chert_postlist.cc.

Referenced by append(), flush(), make_start_of_chunk(), and make_start_of_first_chunk().

current_did

Xapian::docid Chert::PostlistChunkWriter::current_did

private

Definition at line 130 of file chert_postlist.cc.

Referenced by append(), and flush().

first_did

Xapian::docid Chert::PostlistChunkWriter::first_did

private

Definition at line 129 of file chert_postlist.cc.

Referenced by append(), and flush().

is_first_chunk

bool Chert::PostlistChunkWriter::is_first_chunk

private

Definition at line 125 of file chert_postlist.cc.

Referenced by append(), and flush().

is_last_chunk

bool Chert::PostlistChunkWriter::is_last_chunk

private

Definition at line 126 of file chert_postlist.cc.

Referenced by append(), and flush().

orig_key

string Chert::PostlistChunkWriter::orig_key

private

Definition at line 123 of file chert_postlist.cc.

Referenced by append(), and flush().

started

bool Chert::PostlistChunkWriter::started

private

Definition at line 127 of file chert_postlist.cc.

Referenced by append(), and flush().

tname

string Chert::PostlistChunkWriter::tname

private

Definition at line 124 of file chert_postlist.cc.

Referenced by append(), and flush().

---

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

• backends/chert/chert_postlist.cc