KeyMaker subclass which sorts by distance from a latitude/longitude. More...

#include <geospatial.h>

Inheritance diagram for Xapian::LatLongDistanceKeyMaker:

Collaboration diagram for Xapian::LatLongDistanceKeyMaker:

Public Member Functions
	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoords &centre_, const LatLongMetric &metric_, double defdistance)
	Construct a LatLongDistanceKeyMaker. More...

	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoords &centre_, const LatLongMetric &metric_)
	Construct a LatLongDistanceKeyMaker. More...

	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoords &centre_)
	Construct a LatLongDistanceKeyMaker. More...

	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoord &centre_, const LatLongMetric &metric_, double defdistance)
	Construct a LatLongDistanceKeyMaker. More...

	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoord &centre_, const LatLongMetric &metric_)
	Construct a LatLongDistanceKeyMaker. More...

	LatLongDistanceKeyMaker (Xapian::valueno slot_, const LatLongCoord &centre_)
	Construct a LatLongDistanceKeyMaker. More...

	~LatLongDistanceKeyMaker ()

std::string	operator() (const Xapian::Document &doc) const
	Build a key string for a Document. More...

Public Member Functions inherited from Xapian::KeyMaker
	KeyMaker ()
	Default constructor. More...

virtual	~KeyMaker ()
	Virtual destructor, because we have virtual methods. More...

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

const KeyMaker *	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::valueno	slot
	The value slot to read. More...

LatLongCoords	centre
	The centre point (or points) for distance calculation. More...

const LatLongMetric *	metric
	The metric to use when calculating distances. More...

std::string	defkey
	The default key to return, for documents with no value stored. More...

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

KeyMaker subclass which sorts by distance from a latitude/longitude.

Experimental - see https://xapian.org/docs/deprecation#experimental-features

Results are ordered by the distance from a fixed point, or list of points, calculated according to the metric supplied. If multiple points are supplied (either in the constructor, or in the coordinates stored in a document), the closest pointwise distance is used.

If a document contains no coordinate stored in the specified slot, a special value for the distance will be used. This defaults to a large number, so that such results get a low rank, but may be specified by a constructor parameter.

Definition at line 551 of file geospatial.h.

Constructor & Destructor Documentation

◆ LatLongDistanceKeyMaker() [1/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoords &	centre_,
		const LatLongMetric &	metric_,
		double	defdistance
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	List of points to calculate distance from (closest distance is used).
metric_	LatLongMetric to use.
defdistance	Distance to use for docs with no value set.

Definition at line 574 of file geospatial.h.

◆ LatLongDistanceKeyMaker() [2/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoords &	centre_,
		const LatLongMetric &	metric_
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	List of points to calculate distance from (closest distance is used).
metric_	LatLongMetric to use.

Documents where no value is set are assumed to be a large distance away.

Definition at line 594 of file geospatial.h.

◆ LatLongDistanceKeyMaker() [3/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoords &	centre_
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	List of points to calculate distance from (closest distance is used).

Xapian::GreatCircleMetric is used as the metric.

Documents where no value is set are assumed to be a large distance away.

Definition at line 614 of file geospatial.h.

◆ LatLongDistanceKeyMaker() [4/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoord &	centre_,
		const LatLongMetric &	metric_,
		double	defdistance
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	Point to calculate distance from.
metric_	LatLongMetric to use.
defdistance	Distance to use for docs with no value set.

Definition at line 629 of file geospatial.h.

References Xapian::LatLongCoords::append().

◆ LatLongDistanceKeyMaker() [5/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoord &	centre_,
		const LatLongMetric &	metric_
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	Point to calculate distance from.
metric_	LatLongMetric to use.

Documents where no value is set are assumed to be a large distance away.

Definition at line 650 of file geospatial.h.

References Xapian::LatLongCoords::append().

◆ LatLongDistanceKeyMaker() [6/6]

Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker	(	Xapian::valueno	slot_,
		const LatLongCoord &	centre_
	)

inline

Construct a LatLongDistanceKeyMaker.

Parameters

slot_	Value slot to use.
centre_	Point to calculate distance from.

Xapian::GreatCircleMetric is used as the metric.

Documents where no value is set are assumed to be a large distance away.

Definition at line 671 of file geospatial.h.

References Xapian::LatLongCoords::append().

◆ ~LatLongDistanceKeyMaker()

LatLongDistanceKeyMaker::~LatLongDistanceKeyMaker ( )

Definition at line 46 of file latlong_distance_keymaker.cc.

Member Function Documentation

◆ operator()()

string LatLongDistanceKeyMaker::operator() ( const Xapian::Document & doc ) const

virtual

Build a key string for a Document.

These keys can be used for sorting or collapsing matching documents.

Parameters

doc	Document object to build a key for.

Implements Xapian::KeyMaker.

Definition at line 34 of file latlong_distance_keymaker.cc.

References Xapian::Document::get_value(), Xapian::sortable_serialise(), and Xapian::LatLongCoords::unserialise().

Member Data Documentation

◆ centre

LatLongCoords Xapian::LatLongDistanceKeyMaker::centre

private

The centre point (or points) for distance calculation.

Definition at line 557 of file geospatial.h.

◆ defkey

std::string Xapian::LatLongDistanceKeyMaker::defkey

private

The default key to return, for documents with no value stored.

Definition at line 563 of file geospatial.h.

◆ metric

const LatLongMetric* Xapian::LatLongDistanceKeyMaker::metric

private

The metric to use when calculating distances.

Definition at line 560 of file geospatial.h.

◆ slot

Xapian::valueno Xapian::LatLongDistanceKeyMaker::slot

private

The value slot to read.

Definition at line 554 of file geospatial.h.

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

include/xapian/geospatial.h
geospatial/latlong_distance_keymaker.cc

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ LatLongDistanceKeyMaker() [1/6]

◆ LatLongDistanceKeyMaker() [2/6]

◆ LatLongDistanceKeyMaker() [3/6]

◆ LatLongDistanceKeyMaker() [4/6]

◆ LatLongDistanceKeyMaker() [5/6]

◆ LatLongDistanceKeyMaker() [6/6]

◆ ~LatLongDistanceKeyMaker()

Member Function Documentation

◆ operator()()

Member Data Documentation

◆ centre

◆ defkey

◆ metric

◆ slot