A postlist which adds on an extra weight contribution. More...

#include <extraweightpostlist.h>

Inheritance diagram for ExtraWeightPostList:

Collaboration diagram for ExtraWeightPostList:

Public Member Functions
Xapian::doccount	get_termfreq_max () const
	Get an upper bound on the number of documents indexed by this term. More...

Xapian::doccount	get_termfreq_min () const
	Get a lower bound on the number of documents indexed by this term. More...

Xapian::doccount	get_termfreq_est () const
	Get an estimate of the number of documents indexed by this term. More...

Xapian::docid	get_docid () const
	Return the current docid. More...

double	get_weight () const
	Return the weight contribution for the current position. More...

double	get_maxweight () const
	Return an upper bound on what get_weight() can return. More...

double	recalc_maxweight ()
	Recalculate the upper bound on what get_weight() can return. More...

PostList *	next (double w_min)
	Advance the current position to the next document in the postlist. More...

PostList *	skip_to (Xapian::docid did, double w_min)
	Skip forward to the specified docid. More...

bool	at_end () const
	Return true if the current position is past the last entry in this list. More...

std::string	get_description () const
	Return a string description of this object. More...

virtual Xapian::termcount	get_doclength () const
	Return the document length of the document the current term comes from. More...

virtual Xapian::termcount	get_unique_terms () const
	Return the number of unique terms in the current document. More...

	ExtraWeightPostList (PostList pl_, Xapian::Weight wt_, MultiMatch *matcher_)

	~ExtraWeightPostList ()

Xapian::termcount	count_matching_subqs () const
	Count the number of leaf subqueries which match at the current position. More...

Public Member Functions inherited from Xapian::PostingIterator::Internal
virtual	~Internal ()
	We have virtual methods and want to be able to delete derived classes using a pointer to the base class, so we need a virtual destructor. More...

virtual TermFreqs	get_termfreq_est_using_stats (const Xapian::Weight::Internal &stats) const
	Get an estimate for the termfreq and reltermfreq, given the stats. More...

virtual Xapian::termcount	get_wdf () const
	Return the wdf for the document at the current position. More...

virtual const std::string *	get_sort_key () const

virtual const std::string *	get_collapse_key () const
	If the collapse key is already known, return it. More...

virtual PositionList *	read_position_list ()
	Read the position list for the term in the current document and return a pointer to it (owned by the PostList). More...

virtual PositionList *	open_position_list () const
	Read the position list for the term in the current document and return a pointer to it (not owned by the PostList). More...

virtual Internal *	check (Xapian::docid did, double w_min, bool &valid)
	Check if the specified docid occurs in this postlist. More...

Internal *	next ()
	Advance the current position to the next document in the postlist. More...

Internal *	skip_to (Xapian::docid did)
	Skip forward to the specified docid. More...

virtual void	gather_position_lists (OrPositionList *orposlist)
	Gather PositionList* objects for a subtree. More...

Public Member Functions inherited from Xapian::Internal::intrusive_base
	intrusive_base ()
	Construct with no references. More...

Private Attributes
PostList *	pl

Xapian::Weight *	wt

MultiMatch *	matcher

double	max_weight

Additional Inherited Members
Public Attributes inherited from Xapian::Internal::intrusive_base
unsigned	_refs
	Reference count. More...

Protected Member Functions inherited from Xapian::PostingIterator::Internal
	Internal ()
	Only constructable as a base class for derived classes. More...

Detailed Description

A postlist which adds on an extra weight contribution.

Definition at line 35 of file extraweightpostlist.h.

Constructor & Destructor Documentation

◆ ExtraWeightPostList()

ExtraWeightPostList::ExtraWeightPostList	(	PostList *	pl_,
		Xapian::Weight *	wt_,
		MultiMatch *	matcher_
	)

inline

Definition at line 110 of file extraweightpostlist.h.

◆ ~ExtraWeightPostList()

ExtraWeightPostList::~ExtraWeightPostList ( )

inline

Definition at line 116 of file extraweightpostlist.h.

References pl, and wt.

Member Function Documentation

◆ at_end()

bool ExtraWeightPostList::at_end ( ) const

inlinevirtual

Return true if the current position is past the last entry in this list.

Implements Xapian::PostingIterator::Internal.

Definition at line 93 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::at_end(), and pl.

◆ count_matching_subqs()

Xapian::termcount ExtraWeightPostList::count_matching_subqs ( ) const

inlinevirtual

Count the number of leaf subqueries which match at the current position.

Reimplemented from Xapian::PostingIterator::Internal.

Definition at line 121 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::count_matching_subqs(), and pl.

◆ get_description()

std::string ExtraWeightPostList::get_description ( ) const

inlinevirtual

Return a string description of this object.

Implements Xapian::PostingIterator::Internal.

Definition at line 95 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_description(), and pl.

◆ get_docid()

Xapian::docid ExtraWeightPostList::get_docid ( ) const

inlinevirtual

Return the current docid.

Implements Xapian::PostingIterator::Internal.

Definition at line 53 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_docid(), and pl.

◆ get_doclength()

virtual Xapian::termcount ExtraWeightPostList::get_doclength ( ) const

inlinevirtual

Return the document length of the document the current term comes from.

Implements Xapian::PostingIterator::Internal.

Definition at line 102 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_doclength(), and pl.

◆ get_maxweight()

double ExtraWeightPostList::get_maxweight ( ) const

inlinevirtual

Return an upper bound on what get_weight() can return.

Implements Xapian::PostingIterator::Internal.

Definition at line 65 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_maxweight(), max_weight, and pl.

◆ get_termfreq_est()

Xapian::doccount ExtraWeightPostList::get_termfreq_est ( ) const

inlinevirtual

Get an estimate of the number of documents indexed by this term.

It should always be true that: get_termfreq_min() <= get_termfreq_est() <= get_termfreq_max()

Implements Xapian::PostingIterator::Internal.

Definition at line 49 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_termfreq_est(), and pl.

◆ get_termfreq_max()

Xapian::doccount ExtraWeightPostList::get_termfreq_max ( ) const

inlinevirtual

Get an upper bound on the number of documents indexed by this term.

Implements Xapian::PostingIterator::Internal.

Definition at line 43 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_termfreq_max(), and pl.

◆ get_termfreq_min()

Xapian::doccount ExtraWeightPostList::get_termfreq_min ( ) const

inlinevirtual

Get a lower bound on the number of documents indexed by this term.

Implements Xapian::PostingIterator::Internal.

Definition at line 46 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_termfreq_min(), and pl.

◆ get_unique_terms()

virtual Xapian::termcount ExtraWeightPostList::get_unique_terms ( ) const

inlinevirtual

Return the number of unique terms in the current document.

Implements Xapian::PostingIterator::Internal.

Definition at line 106 of file extraweightpostlist.h.

References Xapian::PostingIterator::Internal::get_unique_terms(), and pl.

◆ get_weight()

double ExtraWeightPostList::get_weight ( ) const

inlinevirtual

Return the weight contribution for the current position.

Implements Xapian::PostingIterator::Internal.

Definition at line 55 of file extraweightpostlist.h.

References AssertRel, Xapian::PostingIterator::Internal::get_doclength(), Xapian::Weight::get_sumextra(), Xapian::PostingIterator::Internal::get_weight(), max_weight, pl, and wt.

◆ next()

PostList* ExtraWeightPostList::next ( double w_min )

inlinevirtual

Advance the current position to the next document in the postlist.

The list starts before the first entry in the list, so next(), skip_to() or check() must be called before any methods which need the context of the current position.

Parameters

w_min The minimum weight contribution that is needed (this is just a hint which PostList subclasses may ignore).

Returns: If a non-NULL pointer is returned, then the caller should substitute the returned pointer for its pointer to us, and then delete us. This "pruning" can only happen for a non-leaf subclass of this class.

Implements Xapian::PostingIterator::Internal.

Definition at line 73 of file extraweightpostlist.h.

References matcher, max_weight, Xapian::PostingIterator::Internal::next(), pl, and MultiMatch::recalc_maxweight().

◆ recalc_maxweight()

double ExtraWeightPostList::recalc_maxweight ( )

inlinevirtual

Recalculate the upper bound on what get_weight() can return.

If the tree has pruned, get_maxweight() may use cached values. Calling this method instead forces a full recalculation.

Note that this method may be called after the postlist has reached the end. In this situation, the method should return 0.

Implements Xapian::PostingIterator::Internal.

Definition at line 69 of file extraweightpostlist.h.

References max_weight, pl, and Xapian::PostingIterator::Internal::recalc_maxweight().

◆ skip_to()

PostList* ExtraWeightPostList::skip_to	(	Xapian::docid	did,
		double	w_min
	)

inlinevirtual

Skip forward to the specified docid.

If the specified docid isn't in the list, position ourselves on the first document after it (or at_end() if no greater docids are present).

Parameters

w_min The minimum weight contribution that is needed (this is just a hint which PostList subclasses may ignore).

Returns: If a non-NULL pointer is returned, then the caller should substitute the returned pointer for its pointer to us, and then delete us. This "pruning" can only happen for a non-leaf subclass of this class.

Implements Xapian::PostingIterator::Internal.

Definition at line 83 of file extraweightpostlist.h.

References matcher, max_weight, pl, MultiMatch::recalc_maxweight(), and Xapian::PostingIterator::Internal::skip_to().