This class implements the TradWeight scheme for query expansion. More...

Inheritance diagram for Xapian::Internal::TradEWeight:

Collaboration diagram for Xapian::Internal::TradEWeight:

Public Member Functions
	TradEWeight (const Xapian::Database &db_, Xapian::doccount rsize_, bool use_exact_termfreq_, double expand_k_)
	Constructor. More...

double	get_weight () const
	Calculate the weight. More...

Public Member Functions inherited from Xapian::Internal::ExpandWeight
	ExpandWeight (const Xapian::Database &db_, Xapian::doccount rsize_, bool use_exact_termfreq_, bool want_collection_freq_)
	Constructor. More...

	ExpandWeight (const Xapian::Database &db_, Xapian::doccount rsize_, bool use_exact_termfreq_, bool want_collection_freq_, double expand_k_)
	Constructor. More...

void	collect_stats (TermList *merger, const std::string &term)
	Get the term statistics. More...

Additional Inherited Members
Protected Member Functions inherited from Xapian::Internal::ExpandWeight
double	get_avlen () const
	Return the average length of the database. More...

Xapian::doccount	get_rsize () const
	Return the number of documents in the RSet. More...

Xapian::termcount	get_collection_freq () const
	Return the collection frequency of the term. More...

Xapian::totallength	get_collection_len () const
	Return the length of the collection. More...

Xapian::doccount	get_dbsize () const
	Return the size of the database. More...

Protected Attributes inherited from Xapian::Internal::ExpandWeight
ExpandStats	stats
	An ExpandStats object to accumulate statistics. More...

Detailed Description

This class implements the TradWeight scheme for query expansion.

It is the default scheme for query expansion.

Definition at line 222 of file expandweight.h.

Constructor & Destructor Documentation

Xapian::Internal::TradEWeight::TradEWeight	(	const Xapian::Database &	db_,
		Xapian::doccount	rsize_,
		bool	use_exact_termfreq_,
		double	expand_k_
	)

inline

Constructor.

Parameters

db_	The database.
rsize_	The number of documents in the RSet.
use_exact_termfreq_	When expanding over a combined database, should we use the exact termfreq (if false a cheaper approximation is used).
expand_k_	The parameter for TradWeight query expansion.

All the parameters are passed to the parent ExpandWeight object.

Definition at line 235 of file expandweight.h.

double Xapian::Internal::TradEWeight::get_weight ( ) const

virtual

Calculate the weight.

Definition at line 32 of file tradeweight.cc.

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