xapian-core  1.4.21
Public Member Functions | Static Public Member Functions | List of all members
GlassPositionListTable Class Reference

#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, 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...
 
GlassCursorcursor_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...
 
GlassChangeschanges_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
dbdirThe directory the glass database is stored in.
readonlytrue 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

◆ pack()

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

Pack a position list into a string.

Parameters
sThe 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: