Class RecursivePrefixTreeStrategy

A PrefixTreeStrategy which uses AbstractVisitingPrefixTreeFilter. This strategy has support for searching non-point shapes (note: not tested). Even a query shape with distErrPct=0 (fully precise to the grid) should have good performance for typical data, unless there is a lot of indexed data coincident with the shape's edge.

Note

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

Inheritance
object
SpatialStrategy
PrefixTreeStrategy
RecursivePrefixTreeStrategy
Inherited Members
Namespace: Lucene.Net.Spatial.Prefix
Assembly: Lucene.Net.Spatial.dll
Syntax
public class RecursivePrefixTreeStrategy : PrefixTreeStrategy

Constructors

RecursivePrefixTreeStrategy(SpatialPrefixTree, string)

A PrefixTreeStrategy which uses AbstractVisitingPrefixTreeFilter. This strategy has support for searching non-point shapes (note: not tested). Even a query shape with distErrPct=0 (fully precise to the grid) should have good performance for typical data, unless there is a lot of indexed data coincident with the shape's edge.

Note

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

Declaration
public RecursivePrefixTreeStrategy(SpatialPrefixTree grid, string fieldName)
Parameters
Type Name Description
SpatialPrefixTree grid
string fieldName

Fields

m_multiOverlappingIndexedShapes

See m_multiOverlappingIndexedShapes.

Declaration
protected bool m_multiOverlappingIndexedShapes
Field Value
Type Description
bool

m_pointsOnly

True if only indexed points shall be supported. See hasIndexedLeaves.

Declaration
protected bool m_pointsOnly
Field Value
Type Description
bool

Properties

PrefixGridScanLevel

Sets the grid level [1-maxLevels] at which indexed terms are scanned brute-force instead of by grid decomposition. By default this is maxLevels - 4. The final level, maxLevels, is always scanned. Value can be 1 to maxLevels.

Declaration
public virtual int PrefixGridScanLevel { get; set; }
Property Value
Type Description
int

Methods

MakeFilter(SpatialArgs)

Make a Filter based principally on SpatialOperation and Spatial4n.Shapes.IShape from the supplied args.

If a subclasses implements MakeQuery(SpatialArgs) then this method could be simply: 
return new QueryWrapperFilter(MakeQuery(args).Query);
Declaration
public override Filter MakeFilter(SpatialArgs args)
Parameters
Type Name Description
SpatialArgs args
Returns
Type Description
Filter
Overrides
Exceptions
Type Condition
NotSupportedException

If the strategy does not support the shape in args.
UnsupportedSpatialOperationException

If the strategy does not support the SpatialOperation in args.

ToString()

Returns a string that represents the current object.

Declaration
public override string ToString()
Returns
Type Description
string

A string that represents the current object.
Overrides