Class PointVectorStrategy

Simple SpatialStrategy which represents Points in two numeric Lucene.Net.Documents.DoubleFields. The Strategy's best feature is decent distance sort.

Characteristics:

• Only indexes points; just one per field value.
• Can query by a rectangle or circle.
• Intersects and IsWithin is supported.
• Uses the FieldCache for MakeDistanceValueSource(IPoint) and for searching with a Circle.

Implementation:

This is a simple Strategy. Search works with Lucene.Net.Search.NumericRangeQuerys on an x & y pair of fields. A Circle query does the same bbox query but adds a ValueSource filter on MakeDistanceValueSource(IPoint).

One performance shortcoming with this strategy is that a scenario involving both a search using a Circle and sort will result in calculations for the spatial distance being done twice -- once for the filter and second for the sort.

Note

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

Inheritance

System.Object

SpatialStrategy

PointVectorStrategy

Inherited Members

SpatialStrategy.m_ctx

SpatialStrategy.SpatialContext

SpatialStrategy.FieldName

SpatialStrategy.MakeDistanceValueSource(IPoint)

SpatialStrategy.MakeRecipDistanceValueSource(IShape)

SpatialStrategy.ToString()

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

Namespace: Lucene.Net.Spatial.Vector

Assembly: Lucene.Net.Spatial.dll

Syntax

public class PointVectorStrategy : SpatialStrategy

Constructors

PointVectorStrategy(SpatialContext, String)

Declaration

public PointVectorStrategy(SpatialContext ctx, string fieldNamePrefix)

Parameters

Type	Name	Description
Spatial4n.Core.Context.SpatialContext	ctx
System.String	fieldNamePrefix

Fields

SUFFIX_X

Declaration

public static string SUFFIX_X

Field Value

Type	Description
System.String

SUFFIX_Y

Declaration

public static string SUFFIX_Y

Field Value

Type	Description
System.String

Properties

PrecisionStep

Declaration

public virtual int PrecisionStep { get; set; }

Property Value

Type	Description
System.Int32

Methods

CreateIndexableFields(IPoint)

See CreateIndexableFields(IShape)

Declaration

public virtual Field[] CreateIndexableFields(IPoint point)

Parameters

Type	Name	Description
Spatial4n.Core.Shapes.IPoint	point

Returns

Type	Description
Lucene.Net.Documents.Field[]

CreateIndexableFields(IShape)

Declaration

public override Field[] CreateIndexableFields(IShape shape)

Parameters

Type	Name	Description
Spatial4n.Core.Shapes.IShape	shape

Returns

Type	Description
Lucene.Net.Documents.Field[]

Overrides

SpatialStrategy.CreateIndexableFields(IShape)

MakeDistanceValueSource(IPoint, Double)

Declaration

public override ValueSource MakeDistanceValueSource(IPoint queryPoint, double multiplier)

Parameters

Type	Name	Description
Spatial4n.Core.Shapes.IPoint	queryPoint
System.Double	multiplier

Returns

Type	Description
Lucene.Net.Queries.Function.ValueSource

Overrides

SpatialStrategy.MakeDistanceValueSource(IPoint, Double)

MakeFilter(SpatialArgs)

Declaration

public override Filter MakeFilter(SpatialArgs args)

Parameters

Type	Name	Description
SpatialArgs	args

Returns

Type	Description
Lucene.Net.Search.Filter

Overrides

SpatialStrategy.MakeFilter(SpatialArgs)

MakeQuery(SpatialArgs)

Declaration

public override ConstantScoreQuery MakeQuery(SpatialArgs args)

Parameters

Type	Name	Description
SpatialArgs	args

Returns

Type	Description
Lucene.Net.Search.ConstantScoreQuery

Overrides

SpatialStrategy.MakeQuery(SpatialArgs)

MakeQueryDistanceScore(SpatialArgs)

Declaration

public virtual Query MakeQueryDistanceScore(SpatialArgs args)

Parameters

Type	Name	Description
SpatialArgs	args

Returns

Type	Description
Lucene.Net.Search.Query