Brass::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...
Public Member Functions | |
| PostlistChunkWriter (const string &orig_key_, bool is_first_chunk_, const string &tname_, bool is_last_chunk_) | |
| void | append (BrassTable *table, Xapian::docid did, Xapian::termcount wdf) |
| Append an entry to this chunk. | |
| void | raw_append (Xapian::docid first_did_, Xapian::docid current_did_, const string &s) |
| Append a block of raw entries to this chunk. | |
| void | flush (BrassTable *table) |
| Flush the chunk to the buffered table. | |
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 98 of file brass_postlist.cc.
Constructor & Destructor Documentation
| PostlistChunkWriter::PostlistChunkWriter | ( | const string & | orig_key_, | |
| bool | is_first_chunk_, | |||
| const string & | tname_, | |||
| bool | is_last_chunk_ | |||
| ) |
Member Function Documentation
| void PostlistChunkWriter::append | ( | BrassTable * | table, | |
| Xapian::docid | did, | |||
| Xapian::termcount | wdf | |||
| ) |
Append an entry to this chunk.
Definition at line 323 of file brass_postlist.cc.
References Assert, chunk, CHUNKSIZE, current_did, first_did, flush(), is_first_chunk, is_last_chunk, make_key(), orig_key, pack_uint(), started, and tname.
Referenced by BrassPostListTable::merge_changes(), and BrassPostListTable::merge_doclen_changes().
| void PostlistChunkWriter::flush | ( | BrassTable * | 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 394 of file brass_postlist.cc.
References BrassTable::add(), Assert, check_tname_in_key(), chunk, current_did, BrassTable::cursor_get(), BrassTable::del(), first_did, BrassTable::get_exact_entry(), is_first_chunk, is_last_chunk, LOGCALL_VOID, LOGLINE, 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, unpack_uint_preserving_sort(), and write_start_of_chunk().
Referenced by append(), BrassPostListTable::merge_changes(), and BrassPostListTable::merge_doclen_changes().
| void Brass::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 110 of file brass_postlist.cc.
References Assert, chunk, current_did, first_did, and started.
Member Data Documentation
string Brass::PostlistChunkWriter::chunk [private] |
Definition at line 137 of file brass_postlist.cc.
Referenced by append(), flush(), and raw_append().
Definition at line 135 of file brass_postlist.cc.
Referenced by append(), flush(), and raw_append().
Definition at line 134 of file brass_postlist.cc.
Referenced by append(), flush(), and raw_append().
bool Brass::PostlistChunkWriter::is_first_chunk [private] |
bool Brass::PostlistChunkWriter::is_last_chunk [private] |
string Brass::PostlistChunkWriter::orig_key [private] |
bool Brass::PostlistChunkWriter::started [private] |
Definition at line 132 of file brass_postlist.cc.
Referenced by append(), flush(), and raw_append().
string Brass::PostlistChunkWriter::tname [private] |
The documentation for this class was generated from the following file:
- backends/brass/brass_postlist.cc