org.apache.lucene.demo.facet
Class DistanceFacetsExample

java.lang.Object
  org.apache.lucene.demo.facet.DistanceFacetsExample

All Implemented Interfaces:

Closeable

public class DistanceFacetsExample
extends Object
implements Closeable

Shows simple usage of dynamic range faceting, using the expressions module to calculate distance.

Field Summary

static double	EARTH_RADIUS_KM Radius of the Earth in KM NOTE: this is approximate, because the earth is a bit wider at the equator than the poles.
static double	ORIGIN_LATITUDE The "home" latitude.
static double	ORIGIN_LONGITUDE The "home" longitude.

Constructor Summary

DistanceFacetsExample()
Empty constructor

Method Summary

void	close()
TopDocs	drillDown(DoubleRange range) User drills down on the specified range.
static Filter	getBoundingBoxFilter(double originLat, double originLng, double maxDistanceKM) Given a latitude and longitude (in degrees) and the maximum great circle (surface of the earth) distance, returns a simple Filter bounding box to "fast match" candidates.
void	index() Build the example index.
static void	main(String[] args) Runs the search and drill-down examples and prints the results.
FacetResult	search() User runs a query and counts facets.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ORIGIN_LATITUDE

public static final double ORIGIN_LATITUDE

The "home" latitude.

See Also:

Constant Field Values

ORIGIN_LONGITUDE

public static final double ORIGIN_LONGITUDE

The "home" longitude.

See Also:

Constant Field Values

EARTH_RADIUS_KM

public static final double EARTH_RADIUS_KM

Radius of the Earth in KM NOTE: this is approximate, because the earth is a bit wider at the equator than the poles. See http://en.wikipedia.org/wiki/Earth_radius

See Also:

Constant Field Values

Constructor Detail

DistanceFacetsExample

public DistanceFacetsExample()

Empty constructor

Method Detail

index

public void index()
           throws IOException

Build the example index.

Throws:

IOException

getBoundingBoxFilter

public static Filter getBoundingBoxFilter(double originLat,
                                          double originLng,
                                          double maxDistanceKM)

Given a latitude and longitude (in degrees) and the maximum great circle (surface of the earth) distance, returns a simple Filter bounding box to "fast match" candidates.

search

public FacetResult search()
                   throws IOException

User runs a query and counts facets.

Throws:

IOException

drillDown

public TopDocs drillDown(DoubleRange range)
                  throws IOException

User drills down on the specified range.

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Throws:

IOException

main

public static void main(String[] args)
                 throws Exception

Runs the search and drill-down examples and prints the results.

Throws:

Exception