Class PointVectorStrategy

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

Characteristics:

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
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

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PointVectorStrategy(SpatialContext, String)

Declaration
public PointVectorStrategy(SpatialContext ctx, string fieldNamePrefix)
Parameters
Type Name Description
Spatial4n.Context.SpatialContext ctx
System.String fieldNamePrefix

Fields

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SUFFIX_X

Declaration
public const string SUFFIX_X = "__x"
Field Value
Type Description
System.String
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SUFFIX_Y

Declaration
public const string SUFFIX_Y = "__y"
Field Value
Type Description
System.String

Properties

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PrecisionStep

Declaration
public virtual int PrecisionStep { get; set; }
Property Value
Type Description
System.Int32

Methods

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CreateIndexableFields(IPoint)

See CreateIndexableFields(IShape)

Declaration
public virtual Field[] CreateIndexableFields(IPoint point)
Parameters
Type Name Description
Spatial4n.Shapes.IPoint point
Returns
Type Description
Lucene.Net.Documents.Field[]
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CreateIndexableFields(IShape)

Declaration
public override Field[] CreateIndexableFields(IShape shape)
Parameters
Type Name Description
Spatial4n.Shapes.IShape shape
Returns
Type Description
Lucene.Net.Documents.Field[]
Overrides
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MakeDistanceValueSource(IPoint, Double)

Declaration
public override ValueSource MakeDistanceValueSource(IPoint queryPoint, double multiplier)
Parameters
Type Name Description
Spatial4n.Shapes.IPoint queryPoint
System.Double multiplier
Returns
Type Description
Lucene.Net.Queries.Function.ValueSource
Overrides
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MakeFilter(SpatialArgs)

Declaration
public override Filter MakeFilter(SpatialArgs args)
Parameters
Type Name Description
SpatialArgs args
Returns
Type Description
Lucene.Net.Search.Filter
Overrides
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MakeQuery(SpatialArgs)

Declaration
public override ConstantScoreQuery MakeQuery(SpatialArgs args)
Parameters
Type Name Description
SpatialArgs args
Returns
Type Description
Lucene.Net.Search.ConstantScoreQuery
Overrides
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MakeQueryDistanceScore(SpatialArgs)

Declaration
public virtual Query MakeQueryDistanceScore(SpatialArgs args)
Parameters
Type Name Description
SpatialArgs args
Returns
Type Description
Lucene.Net.Search.Query