Postlist which matches terms occurring within a specified window. More...

#include <nearpostlist.h>

Inheritance diagram for NearPostList:

Collaboration diagram for NearPostList:

Public Member Functions
	NearPostList (PostList source_, EstimateOp estimate_op_, Xapian::termpos window_, const std::vector< PostList * >::const_iterator &terms_begin, const std::vector< PostList * >::const_iterator &terms_end, PostListTree *pltree_)

	~NearPostList ()

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

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

Public Member Functions inherited from SelectPostList
	SelectPostList (PostList pl_, EstimateOp estimate_op_, PostListTree *pltree_)

	~SelectPostList ()

double	get_weight (Xapian::termcount doclen, Xapian::termcount unique_terms, Xapian::termcount wdfdocmax) const
	Return the weight contribution for the current position. More...

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

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

Public Member Functions inherited from WrapperPostList
	WrapperPostList (PostList *pl_)

	~WrapperPostList ()

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

double	get_weight (Xapian::termcount doclen, Xapian::termcount unique_terms, Xapian::termcount wdfdocmax) const
	Return the weight contribution for the current position. More...

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

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

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...

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

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

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

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

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::Internal::PostList
virtual	~PostList ()
	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...

Xapian::doccount	get_termfreq () const
	Get an estimate of the number of documents this PostList will return. 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...

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

PostList *	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...

virtual void	get_docid_range (docid &first, docid &last) const
	Get the bounds on the range of docids this PostList can return. More...

Private Member Functions
bool	test_doc ()
	Test if the current document contains the terms within the window. More...

Private Attributes
Xapian::termpos	window

std::vector< PostList * >	terms

PositionList **	poslists

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

Protected Attributes inherited from SelectPostList
Xapian::doccount	accepted = 0
	Number of times test_doc() returned true. More...

Xapian::doccount	rejected = 0
	Number of times test_doc() returned false. More...

EstimateOp *	estimate_op
	Object to report accepted/rejected counts to. More...

Protected Attributes inherited from WrapperPostList
PostList *	pl

Protected Attributes inherited from Xapian::Internal::PostList
Xapian::doccount	termfreq
	Estimate of the number of documents this PostList will return. More...

Detailed Description

Postlist which matches terms occurring within a specified window.

NearPostList only returns a posting for documents contains all the terms (this part is implemented using an AndPostList) and additionally the terms occur somewhere in the document within a specified number of term positions.

The weight of a posting is the sum of the weights of the sub-postings (just like an AndPostList).

Definition at line 41 of file nearpostlist.h.

Constructor & Destructor Documentation

◆ NearPostList()

NearPostList::NearPostList	(	PostList *	source_,
		EstimateOp *	estimate_op_,
		Xapian::termpos	window_,
		const std::vector< PostList * >::const_iterator &	terms_begin,
		const std::vector< PostList * >::const_iterator &	terms_end,
		PostListTree *	pltree_
	)