#include <glass_positionlist.h>

Inheritance diagram for GlassPositionListTable:

Collaboration diagram for GlassPositionListTable:

Public Member Functions
	GlassPositionListTable (const string &dbdir, bool readonly)
	Create a new GlassPositionListTable object. More...

	GlassPositionListTable (int fd, off_t offset_, bool readonly_)

void	pack (string &s, const std::vector< Xapian::termpos > &vec) const
	Pack a position list into a string. More...

void	set_positionlist (Xapian::docid did, const string &tname, const string &s)
	Set the position list for term tname in document did. More...

void	delete_positionlist (Xapian::docid did, const string &tname)
	Delete the position list for term tname in document did. More...

Xapian::termcount	positionlist_count (const string &data) const
	Return the number of entries in specified position list data. More...

Xapian::termcount	positionlist_count (Xapian::docid did, const string &term) const
	Return the number of entries in specified position list. More...

Public Member Functions inherited from GlassLazyTable
	GlassLazyTable (const char *name_, const std::string &path, bool readonly)
	Create a new lazy table. More...

	GlassLazyTable (const char *name_, int fd, off_t offset_, bool readonly)

Public Member Functions inherited from GlassTable
	GlassTable (const char *tablename_, const std::string &path_, bool readonly_, bool lazy=false)
	Create a new Btree object. More...

	GlassTable (const char *tablename_, int fd, off_t offset_, bool readonly_, bool lazy=false)

	~GlassTable ()
	Close the Btree. More...

void	close (bool permanent=false)
	Close the Btree. More...

bool	readahead_key (const string &key) const

bool	exists () const
	Determine whether the btree exists on disk. More...

void	open (int flags_, const RootInfo &root_info, glass_revision_number_t rev)
	Open the btree. More...

bool	is_open () const
	Return true if this table is open. More...

bool	is_writable () const
	Return true if this table is writable. More...

void	flush_db ()
	Flush any outstanding changes to the DB file of the table. More...

void	commit (glass_revision_number_t revision, RootInfo *root_info)
	Commit any outstanding changes to the table. More...

bool	sync ()

void	cancel (const RootInfo &root_info, glass_revision_number_t rev)
	Cancel any outstanding changes. More...

bool	get_exact_entry (const std::string &key, std::string &tag) const
	Read an entry from the table, if and only if it is exactly that being asked for. More...

bool	key_exists (const std::string &key) const
	Check if a key exists in the Btree. More...

bool	read_tag (Glass::Cursor C_, std::string tag, bool keep_compressed) const
	Read the tag value for the key pointed to by cursor C_. More...

void	add (const std::string &key, const std::string &tag, bool already_compressed=false)
	Add a key/tag pair to the table, replacing any existing pair with the same key. More...

bool	del (const std::string &key)
	Delete an entry from the table. More...

int	get_flags () const

void	create_and_open (int flags_, const RootInfo &root_info)
	Create a new empty btree structure on disk and open it at the initial revision. More...

void	set_full_compaction (bool parity)

glass_revision_number_t	get_open_revision_number () const
	Get the revision number at which this table is currently open. More...

glass_tablesize_t	get_entry_count () const
	Return a count of the number of entries in the table. More...

bool	empty () const
	Return true if there are no entries in the table. More...

GlassCursor *	cursor_get () const
	Get a cursor for reading from the table. More...

bool	is_modified () const
	Determine whether the object contains uncommitted modifications. More...

void	set_max_item_size (size_t block_capacity)
	Set the maximum item size given the block capacity. More...

void	set_changes (GlassChanges *changes)
	Set the GlassChanges object to write changed blocks to. More...

string	get_path () const

Static Public Member Functions
static string	make_key (Xapian::docid did, const string &term)

Static Public Member Functions inherited from GlassTable
static void	throw_database_closed ()
	Throw an exception indicating that the database is closed. More...

Additional Inherited Members
Protected Member Functions inherited from GlassTable
bool	find (Glass::Cursor *) const
	find(C_) searches for the key of B->kt in the B-tree. More...

int	delete_kt ()

void	read_block (uint4 n, uint8_t *p) const
	read_block(n, p) reads block n of the DB file to address p. More...

void	write_block (uint4 n, const uint8_t *p, bool appending=false) const
	write_block(n, p, appending) writes block n in the DB file from address p. More...

void	set_overwritten () const

void	block_to_cursor (Glass::Cursor *C_, int j, uint4 n) const

void	alter ()
	Btree::alter(); is called when the B-tree is to be altered. More...

void	compact (uint8_t *p)
	compact(p) compact the block at p by shuffling all the items up to the end. More...

void	enter_key_above_leaf (Glass::LeafItem previtem, Glass::LeafItem newitem)
	enter_key_above_leaf(previtem, newitem) is called after a leaf block split. More...

void	enter_key_above_branch (int j, Glass::BItem newitem)
	enter_key_above_branch(j, newkey) is called after a branch block split. More...

int	mid_point (uint8_t *p) const
	mid_point(p) finds the directory entry in c that determines the approximate mid point of the data in the block at p. More...

void	add_item_to_leaf (uint8_t *p, Glass::LeafItem kt, int c)
	add_item_to_leaf(p, kt_, c) adds item kt_ to the leaf block at p. More...

void	add_item_to_branch (uint8_t *p, Glass::BItem kt, int c)
	add_item_to_branch(p, kt_, c) adds item kt_ to the branch block at p. More...

void	add_leaf_item (Glass::LeafItem kt)
	GlassTable::add_leaf_item(kt_) adds item kt_ to the leaf block. More...

void	add_branch_item (Glass::BItem kt, int j)
	GlassTable::add_item(kt_, j) adds item kt_ to the block at cursor level C[j]. More...

void	delete_leaf_item (bool repeatedly)
	GlassTable::delete_leaf_item(repeatedly) is (almost) the converse of add_leaf_item. More...

void	delete_branch_item (int j)
	GlassTable::delete_branch_item(j, repeatedly) is (almost) the converse of add_branch_item. More...

int	add_kt (bool found)
	add_kt(found) adds the item (key-tag pair) at B->kt into the B-tree, using cursor C. More...

void	read_root ()

void	split_root (uint4 split_n)
	Btree needs to gain a new level to insert more items: so split root block and construct a new one. More...

void	form_key (const std::string &key) const

bool	single_file () const

bool	prev (Glass::Cursor *C_, int j) const

bool	next (Glass::Cursor *C_, int j) const

bool	prev_default (Glass::Cursor *C_, int j) const

bool	next_default (Glass::Cursor *C_, int j) const

bool	prev_for_sequential (Glass::Cursor *C_, int dummy) const

bool	next_for_sequential (Glass::Cursor *C_, int dummy) const

Static Protected Member Functions inherited from GlassTable
static int	find_in_leaf (const uint8_t *p, Glass::LeafItem item, int c, bool &exact)
	find_in_leaf(p, key, c, exact) searches for the key in the leaf block at p. More...

static int	find_in_branch (const uint8_t *p, Glass::LeafItem item, int c)

static int	find_in_branch (const uint8_t *p, Glass::BItem item, int c)

static uint4	block_given_by (const uint8_t *p, int c)
	block_given_by(p, c) finds the item at block address p, directory offset c, and returns its tag value as an integer. More...

Protected Attributes inherited from GlassTable
const char *	tablename
	The name of the table (used when writing changesets). More...

glass_revision_number_t	revision_number
	revision number of the opened B-tree. More...

glass_tablesize_t	item_count
	keeps a count of the number of items in the B-tree. More...

unsigned int	block_size
	block size of the B tree in bytes More...

int	flags
	Flags like DB_NO_SYNC and DB_DANGEROUS. More...

bool	faked_root_block
	true if the root block is faked (not written to disk). More...

bool	sequential
	true iff the data has been written in a single write in sequential order. More...

int	handle
	File descriptor of the table. More...

int	level
	number of levels, counting from 0 More...

uint4	root
	the root block of the B-tree More...

Glass::LeafItem_wr	kt
	buffer of size block_size for making up key-tag items More...

uint8_t *	buffer
	buffer of size block_size for reforming blocks More...

GlassFreeList	free_list
	List of free blocks. More...

std::string	name
	The path name of the B tree. More...

int	seq_count
	count of the number of successive instances of purely sequential addition, starting at SEQ_START_POINT (neg) and going up to zero. More...

uint4	changed_n
	the last block to be changed by an addition More...

int	changed_c
	directory offset corresponding to last block to be changed by an addition More...

size_t	max_item_size
	maximum size of an item (key-tag pair) More...

bool	Btree_modified
	Set to true the first time the B-tree is modified. More...

bool	full_compaction
	set to true when full compaction is to be achieved More...

bool	writable
	Set to true when the database is opened to write. More...

bool	cursor_created_since_last_modification
	Flag for tracking when cursors need to rebuild. More...

unsigned long	cursor_version
	Version count for tracking when cursors need to rebuild. More...

GlassChanges *	changes_obj
	The GlassChanges object to write block changes to. More...

Glass::Cursor	C [GLASS_BTREE_CURSOR_LEVELS]

uint8_t *	split_p
	Buffer used when splitting a block. More...

uint4	compress_min
	Minimum size tag to try compressing (0 for no compression). More...

CompressionStream	comp_stream

bool	lazy
	If true, don't create the table until it's needed. More...

uint4	last_readahead
	Last block readahead_key() preread. More...

off_t	offset
	offset to start of table in file. More...

Detailed Description

Definition at line 37 of file glass_positionlist.h.

Constructor & Destructor Documentation

◆ GlassPositionListTable() [1/2]

GlassPositionListTable::GlassPositionListTable	(	const string &	dbdir,
		bool	readonly
	)

inline

Create a new GlassPositionListTable object.

This method does not create or open the table on disk - you must call the create() or open() methods respectively!

Parameters

dbdir	The directory the glass database is stored in.
readonly	true if we're opening read-only, else false.

Definition at line 54 of file glass_positionlist.h.

◆ GlassPositionListTable() [2/2]

GlassPositionListTable::GlassPositionListTable	(	int	fd,
		off_t	offset_,
		bool	readonly_
	)

inline

Definition at line 57 of file glass_positionlist.h.

Member Function Documentation

◆ delete_positionlist()

void GlassPositionListTable::delete_positionlist	(	Xapian::docid	did,
		const string &	tname
	)

inline

Delete the position list for term tname in document did.

Definition at line 74 of file glass_positionlist.h.

References make_key().

Referenced by Inverter::flush_pos_lists().

◆ make_key()

static string GlassPositionListTable::make_key	(	Xapian::docid	did,
		const string &	term
	)

inlinestatic

Definition at line 39 of file glass_positionlist.h.

References pack_string_preserving_sort(), and pack_uint_preserving_sort().

Referenced by GlassPositionList::read_data(), and Inverter::store_positions().

◆ pack()

void GlassPositionListTable::pack	(	string &	s,
		const std::vector< Xapian::termpos > &	vec
	)		const

Pack a position list into a string.

Parameters

s	The string to append the position list data to.

Definition at line 38 of file glass_positionlist.cc.

References Assert, Xapian::BitWriter::encode(), Xapian::BitWriter::encode_interpolative(), Xapian::BitWriter::freeze(), LOGCALL_VOID, and pack_uint().

Referenced by Inverter::store_positions().

◆ positionlist_count() [1/2]

Xapian::termcount GlassPositionListTable::positionlist_count ( const string & data ) const

Return the number of entries in specified position list data.

Definition at line 56 of file glass_positionlist.cc.

References Assert, Xapian::BitReader::decode(), LOGCALL, RETURN, and unpack_uint().

Referenced by GlassDatabase::positionlist_count(), and GlassWritableDatabase::positionlist_count().

◆ positionlist_count() [2/2]

Xapian::termcount GlassPositionListTable::positionlist_count	(	Xapian::docid	did,
		const string &	term
	)		const

Return the number of entries in specified position list.

Definition at line 81 of file glass_positionlist.cc.

References LOGCALL, make_key(), and RETURN.

◆ set_positionlist()

void GlassPositionListTable::set_positionlist	(	Xapian::docid	did,
		const string &	tname,
		const string &	s
	)

inline

Set the position list for term tname in document did.

Definition at line 68 of file glass_positionlist.h.

References make_key().

Referenced by Inverter::flush_pos_lists().

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

backends/glass/glass_positionlist.h
backends/glass/glass_positionlist.cc

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ GlassPositionListTable() [1/2]

◆ GlassPositionListTable() [2/2]

Member Function Documentation

◆ delete_positionlist()

◆ make_key()

◆ pack()

◆ positionlist_count() [1/2]

◆ positionlist_count() [2/2]

◆ set_positionlist()