Inheritance diagram for ChangeMaxweightPostingSource:

Collaboration diagram for ChangeMaxweightPostingSource:

Public Member Functions
	ChangeMaxweightPostingSource (Xapian::docid maxid_accessed_)

void	init (const Xapian::Database &) override
	Set this PostingSource to the start of the list of postings. More...

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

Xapian::doccount	get_termfreq_min () const override
	A lower bound on the number of documents this object can return. More...

Xapian::doccount	get_termfreq_est () const override
	An estimate of the number of documents this object can return. More...

Xapian::doccount	get_termfreq_max () const override
	An upper bound on the number of documents this object can return. More...

void	next (double) override
	Advance the current position to the next matching document. More...

void	skip_to (Xapian::docid to_did, double) override
	Advance to the specified docid. More...

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

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

string	get_description () const override
	Return a string describing this object. More...

Public Member Functions inherited from Xapian::PostingSource
	PostingSource ()
	Allow subclasses to be instantiated. More...

virtual	~PostingSource ()

void	set_maxweight (double max_weight)
	Specify an upper bound on what get_weight() will return from now on. More...

double	get_maxweight () const
	Return the currently set upper bound on what get_weight() can return. More...

virtual bool	check (Xapian::docid did, double min_wt)
	Check if the specified docid occurs. More...

virtual PostingSource *	clone () const
	Clone the posting source. More...

virtual std::string	name () const
	Name of the posting source class. More...

virtual std::string	serialise () const
	Serialise object parameters into a string. More...

virtual PostingSource *	unserialise (const std::string &serialised) const
	Create object given string serialisation returned by serialise(). More...

virtual PostingSource *	unserialise_with_registry (const std::string &serialised, const Registry &registry) const
	Create object given string serialisation returned by serialise(). More...

PostingSource *	release ()
	Start reference counting this object. More...

const PostingSource *	release () const
	Start reference counting this object. More...

Public Member Functions inherited from Xapian::Internal::opt_intrusive_base
	opt_intrusive_base (const opt_intrusive_base &)

opt_intrusive_base &	operator= (const opt_intrusive_base &)

	opt_intrusive_base ()
	Construct object which is initially not reference counted. More...

virtual	~opt_intrusive_base ()

void	ref () const

void	unref () const

Private Attributes
Xapian::docid	did

Xapian::docid	maxid_accessed

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

Protected Member Functions inherited from Xapian::Internal::opt_intrusive_base
void	release () const
	Start reference counting. More...

Detailed Description

Definition at line 452 of file api_postingsource.cc.

Constructor & Destructor Documentation

◆ ChangeMaxweightPostingSource()

ChangeMaxweightPostingSource::ChangeMaxweightPostingSource ( Xapian::docid maxid_accessed_ )

inline

Definition at line 459 of file api_postingsource.cc.

Member Function Documentation

◆ at_end()

bool ChangeMaxweightPostingSource::at_end ( ) const

inlineoverridevirtual

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

At least one of next(), skip_to() or check() will be called before this method is first called.

Implements Xapian::PostingSource.

Definition at line 487 of file api_postingsource.cc.

Referenced by DEFINE_TESTCASE().

◆ get_description()

string ChangeMaxweightPostingSource::get_description ( ) const

inlineoverridevirtual

Return a string describing this object.

This default implementation returns a generic answer. This default it provided to avoid forcing those deriving their own PostingSource subclass from having to implement this (they may not care what get_description() gives for their subclass).

Reimplemented from Xapian::PostingSource.

Definition at line 489 of file api_postingsource.cc.

◆ get_docid()

Xapian::docid ChangeMaxweightPostingSource::get_docid ( ) const

inlineoverridevirtual

Return the current docid.

This method may assume that it will only be called when there is a "current document". See get_weight() for details.

Note: in the case of a multi-database search, the returned docid should be in the single subdatabase relevant to this posting source. See the init() method for details.

Implements Xapian::PostingSource.

Definition at line 488 of file api_postingsource.cc.

Referenced by DEFINE_TESTCASE().

◆ get_termfreq_est()

Xapian::doccount ChangeMaxweightPostingSource::get_termfreq_est ( ) const

inlineoverridevirtual

An estimate of the number of documents this object can return.

It must always be true that:

get_termfreq_min() <= get_termfreq_est() <= get_termfreq_max()

Xapian will always call init() on a PostingSource before calling this for the first time.

Implements Xapian::PostingSource.

Definition at line 474 of file api_postingsource.cc.

◆ get_termfreq_max()

Xapian::doccount ChangeMaxweightPostingSource::get_termfreq_max ( ) const

inlineoverridevirtual

An upper bound on the number of documents this object can return.

Xapian will always call init() on a PostingSource before calling this for the first time.

Implements Xapian::PostingSource.

Definition at line 475 of file api_postingsource.cc.

◆ get_termfreq_min()

Xapian::doccount ChangeMaxweightPostingSource::get_termfreq_min ( ) const

inlineoverridevirtual

A lower bound on the number of documents this object can return.

Xapian will always call init() on a PostingSource before calling this for the first time.

Implements Xapian::PostingSource.

Definition at line 473 of file api_postingsource.cc.

◆ get_weight()

double ChangeMaxweightPostingSource::get_weight ( ) const

inlineoverridevirtual

Return the weight contribution for the current document.

This default implementation always returns 0, for convenience when implementing "weight-less" PostingSource subclasses.

This method may assume that it will only be called when there is a "current document". In detail: Xapian will always call init() on a PostingSource before calling this for the first time. It will also only call this if the PostingSource reports that it is pointing to a valid document (ie, it will not call it before calling at least one of next(), skip_to() or check(), and will ensure that the PostingSource is not at the end by calling at_end()).

Reimplemented from Xapian::PostingSource.

Definition at line 464 of file api_postingsource.cc.

References FAIL_TEST, and Xapian::Internal::str().

◆ init()

void ChangeMaxweightPostingSource::init ( const Xapian::Database & db )

inlineoverridevirtual

Set this PostingSource to the start of the list of postings.

This is called automatically by the matcher prior to each query being processed.

If a PostingSource is used for multiple searches, init() will therefore be called multiple times, and must handle this by using the database passed in the most recent call.

Parameters

db	The database which the PostingSource should iterate through.

Note: in the case of a multi-database search, a separate PostingSource will be used for each database (the separate PostingSources will be obtained using clone()), and each PostingSource will be passed one of the sub-databases as the db parameter here. The db parameter will therefore always refer to a single database. All docids passed to, or returned from, the PostingSource refer to docids in that single database, rather than in the multi-database.

Implements Xapian::PostingSource.

Definition at line 462 of file api_postingsource.cc.

◆ next()

void ChangeMaxweightPostingSource::next ( double min_wt )

inlineoverridevirtual

Advance the current position to the next matching document.

The PostingSource 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.

Xapian will always call init() on a PostingSource before calling this for the first time.

Parameters

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

Implements Xapian::PostingSource.

Definition at line 477 of file api_postingsource.cc.

◆ skip_to()

void ChangeMaxweightPostingSource::skip_to	(	Xapian::docid	did,
		double	min_wt
	)

inlineoverridevirtual

Advance 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).

If the current position is already the specified docid, this method will leave the position unmodified.

If the specified docid is earlier than the current position, the behaviour is unspecified. A sensible behaviour would be to leave the current position unmodified, but it is also reasonable to move to the specified docid.

The default implementation calls next() repeatedly, which works but skip_to() can often be implemented much more efficiently.

Xapian will always call init() on a PostingSource before calling this for the first time.

Note: in the case of a multi-database search, the docid specified is the docid in the single subdatabase relevant to this posting source. See the init() method for details.

Parameters

did	The document id to advance to.
min_wt	The minimum weight contribution that is needed (this is just a hint which subclasses may ignore).

Reimplemented from Xapian::PostingSource.

Definition at line 482 of file api_postingsource.cc.

Member Data Documentation

◆ did

Xapian::docid ChangeMaxweightPostingSource::did

private

Definition at line 453 of file api_postingsource.cc.

◆ maxid_accessed

Xapian::docid ChangeMaxweightPostingSource::maxid_accessed

private

Definition at line 456 of file api_postingsource.cc.

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

tests/api_postingsource.cc

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ChangeMaxweightPostingSource()

Member Function Documentation

◆ at_end()

◆ get_description()

◆ get_docid()

◆ get_termfreq_est()

◆ get_termfreq_max()

◆ get_termfreq_min()

◆ get_weight()

◆ init()

◆ next()

◆ skip_to()

Member Data Documentation

◆ did

◆ maxid_accessed