org.apache.lucene.document

Class LatLonShape

java.lang.Object

org.apache.lucene.document.LatLonShape

public class LatLonShape
extends Object

An indexed shape utility class.

Polygon's are decomposed into a triangular mesh using the Tessellator utility class Each Tessellator.Triangle is encoded and indexed as a multi-value field.

Finding all shapes that intersect a range (e.g., bounding box) at search time is efficient.

This class defines static factory methods for common operations:

• createIndexableFields(String, Polygon) for matching polygons that intersect a bounding box.
• newBoxQuery() for matching polygons that intersect a bounding box.

WARNING: Like LatLonPoint, vertex values are indexed with some loss of precision from the original double values (4.190951585769653E-8 for the latitude component and 8.381903171539307E-8 for longitude).

See Also:

PointValues, LatLonDocValuesField

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LatLonShape.QueryRelation Query Relation Types

Field Summary

Fields

Modifier and Type	Field and Description
protected static FieldType	TYPE

Method Summary

Modifier and Type	Method and Description
static Field[]	createIndexableFields(String fieldName, double lat, double lon) create indexable fields for point geometry
static Field[]	createIndexableFields(String fieldName, Line line) create indexable fields for line geometry
static Field[]	createIndexableFields(String fieldName, Polygon polygon) create indexable fields for polygon geometry
static void	decodeTriangle(byte[] t, int[] triangle) Decode a triangle encoded by encodeTriangle(byte[], int, int, int, int, int, int).
static void	encodeTriangle(byte[] bytes, int aLat, int aLon, int bLat, int bLon, int cLat, int cLon) A triangle is encoded using 6 points and an extra point with encoded information in three bits of how to reconstruct it.
static Query	newBoxQuery(String field, LatLonShape.QueryRelation queryRelation, double minLatitude, double maxLatitude, double minLongitude, double maxLongitude) create a query to find all polygons that intersect a defined bounding box
static Query	newLineQuery(String field, LatLonShape.QueryRelation queryRelation, Line... lines) create a query to find all polygons that intersect a provided linestring (or array of linestrings) note: does not support dateline crossing
static Query	newPolygonQuery(String field, LatLonShape.QueryRelation queryRelation, Polygon... polygons) create a query to find all polygons that intersect a provided polygon (or array of polygons) note: does not support dateline crossing

Methods inherited from class java.lang.Object

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

Field Detail

TYPE

protected static final FieldType TYPE

Method Detail

createIndexableFields

public static Field[] createIndexableFields(String fieldName,
                                            Polygon polygon)

create indexable fields for polygon geometry

createIndexableFields

public static Field[] createIndexableFields(String fieldName,
                                            Line line)

create indexable fields for line geometry

createIndexableFields

public static Field[] createIndexableFields(String fieldName,
                                            double lat,
                                            double lon)

create indexable fields for point geometry

newBoxQuery

public static Query newBoxQuery(String field,
                                LatLonShape.QueryRelation queryRelation,
                                double minLatitude,
                                double maxLatitude,
                                double minLongitude,
                                double maxLongitude)

create a query to find all polygons that intersect a defined bounding box

newLineQuery

public static Query newLineQuery(String field,
                                 LatLonShape.QueryRelation queryRelation,
                                 Line... lines)

create a query to find all polygons that intersect a provided linestring (or array of linestrings) note: does not support dateline crossing

newPolygonQuery

public static Query newPolygonQuery(String field,
                                    LatLonShape.QueryRelation queryRelation,
                                    Polygon... polygons)

create a query to find all polygons that intersect a provided polygon (or array of polygons) note: does not support dateline crossing

encodeTriangle

public static void encodeTriangle(byte[] bytes,
                                  int aLat,
                                  int aLon,
                                  int bLat,
                                  int bLon,
                                  int cLat,
                                  int cLon)

A triangle is encoded using 6 points and an extra point with encoded information in three bits of how to reconstruct it. Triangles are encoded with CCW orientation and might be rotated to limit the number of possible reconstructions to 2^3. Reconstruction always happens from west to east.

decodeTriangle

public static void decodeTriangle(byte[] t,
                                  int[] triangle)

Decode a triangle encoded by encodeTriangle(byte[], int, int, int, int, int, int).