Class Cell

Represents a grid cell. These are not necessarily thread-safe, although new Cell("") (world cell) must be.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Inheritance

System.Object

Cell

Implements

System.IComparable<Cell>

Inherited Members

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

System.Object.GetType()

System.Object.MemberwiseClone()

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

Namespace: Lucene.Net.Spatial.Prefix.Tree

Assembly: Lucene.Net.Spatial.dll

Syntax

public abstract class Cell : IComparable<Cell>

Constructors

Cell(SpatialPrefixTree, Byte[], Int32, Int32)

Declaration

protected Cell(SpatialPrefixTree outerInstance, byte[] bytes, int off, int len)

Parameters

Type	Name	Description
SpatialPrefixTree	outerInstance
System.Byte[]	bytes
System.Int32	off
System.Int32	len

Cell(SpatialPrefixTree, String)

Declaration

protected Cell(SpatialPrefixTree outerInstance, string token)

Parameters

Type	Name	Description
SpatialPrefixTree	outerInstance
System.String	token

Fields

LEAF_BYTE

Declaration

public const byte LEAF_BYTE = 43

Field Value

Type	Description
System.Byte

m_leaf

Always false for points.

Declaration

protected bool m_leaf

Field Value

Type	Description
System.Boolean

Remarks

Always false for points. Otherwise, indicate no further sub-cells are going to be provided because shapeRel is WITHIN or maxLevels or a detailLevel is hit.

m_outerInstance

LUCENENET specific - we need to set the SpatialPrefixTree before calling overridden members of this class, just in case those overridden members require it. This is not possible from the subclass because the constructor of the base class runs first. So we need to move the reference here and also set it before running the normal constructor logic.

Declaration

protected readonly SpatialPrefixTree m_outerInstance

Field Value

Type	Description
SpatialPrefixTree

m_shapeRel

When set via GetSubCells(IShape), it is the relationship between this cell and the given shape filter.

Declaration

protected SpatialRelation m_shapeRel

Field Value

Type	Description
Spatial4n.Core.Shapes.SpatialRelation

Properties

Center

Declaration

public virtual IPoint Center { get; }

Property Value

Type	Description
Spatial4n.Core.Shapes.IPoint

IsLeaf

For points, this is always false.

Declaration

public virtual bool IsLeaf { get; }

Property Value

Type	Description
System.Boolean

Remarks

For points, this is always false. Otherwise this is true if there are no further cells with this prefix for the shape (always true at maxLevels).

Level

Declaration

public virtual int Level { get; }

Property Value

Type	Description
System.Int32

Shape

Declaration

public abstract IShape Shape { get; }

Property Value

Type	Description
Spatial4n.Core.Shapes.IShape

ShapeRel

Declaration

public virtual SpatialRelation ShapeRel { get; }

Property Value

Type	Description
Spatial4n.Core.Shapes.SpatialRelation

SubCellsSize

GetSubCells().Count -- usually a constant. Should be >=2

Declaration

public abstract int SubCellsSize { get; }

Property Value

Type	Description
System.Int32

TokenString

Note: doesn't contain a trailing leaf byte.

Declaration

public virtual string TokenString { get; }

Property Value

Type	Description
System.String

Methods

CompareTo(Cell)

Declaration

public virtual int CompareTo(Cell o)

Parameters

Type	Name	Description
Cell	o

Returns

Type	Description
System.Int32

Equals(Object)

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
System.Object	obj

Returns

Type	Description
System.Boolean

Overrides

System.Object.Equals(System.Object)

GetHashCode()

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32

Overrides

System.Object.GetHashCode()

GetSubCell(IPoint)

Performant implementations are expected to implement this efficiently by considering the current cell's boundary.

Declaration

public abstract Cell GetSubCell(IPoint p)

Parameters

Type	Name	Description
Spatial4n.Core.Shapes.IPoint	p

Returns

Type	Description
Cell

Remarks

Performant implementations are expected to implement this efficiently by considering the current cell's boundary. Precondition: Never called when Level == maxLevel.

Precondition: this.Shape.Relate(p) != SpatialRelation.DISJOINT.

GetSubCells()

Gets the cells at the next grid cell level that cover this cell.

Declaration

protected abstract ICollection<Cell> GetSubCells()

Returns

Type	Description
System.Collections.Generic.ICollection<Cell>	A set of cells (no dups), sorted, modifiable, not empty, not null.

Remarks

Gets the cells at the next grid cell level that cover this cell. Precondition: Never called when Level == maxLevel.

GetSubCells(IShape)

Like GetSubCells() but with the results filtered by a shape. If that shape is a Spatial4n.Core.Shapes.IPoint then it must call GetSubCell(IPoint). The returned cells should have ShapeRel set to their relation with shapeFilter. In addition, IsLeaf must be true when that relation is Spatial4n.Core.Shapes.SpatialRelation.WITHIN.

Precondition: Never called when Level == maxLevel.

Declaration

public virtual ICollection<Cell> GetSubCells(IShape shapeFilter)

Parameters

Type	Name	Description
Spatial4n.Core.Shapes.IShape	shapeFilter	an optional filter for the returned cells.

Returns

Type	Description
System.Collections.Generic.ICollection<Cell>	A set of cells (no dups), sorted. Not Modifiable.

GetTokenBytes()

Note: doesn't contain a trailing leaf byte.

Declaration

public virtual byte[] GetTokenBytes()

Returns

Type	Description
System.Byte[]

Reset(Byte[], Int32, Int32)

Declaration

public virtual void Reset(byte[] bytes, int off, int len)

Parameters

Type	Name	Description
System.Byte[]	bytes
System.Int32	off
System.Int32	len

SetLeaf()

Note: not supported at level 0.

Declaration

public virtual void SetLeaf()

ToString()

Declaration

public override string ToString()

Returns

Type	Description
System.String

Overrides

System.Object.ToString()

Implements

System.IComparable<T>