Class ReverseStringFilter

Reverse token string, for example "country" => "yrtnuoc".

If Lucene.Net.Analysis.Reverse.ReverseStringFilter.marker is supplied, then tokens will be also prepended by that character. For example, with a marker of \u0001, "country" => "\u0001yrtnuoc". This is useful when implementing efficient leading wildcards search.

You must specify the required LuceneVersion compatibility when creating ReverseStringFilter, or when using any of its static methods:

As of 3.1, supplementary characters are handled correctly

Inheritance

System.Object

AttributeSource

TokenStream

TokenFilter

ReverseStringFilter

Implements

IDisposable

Inherited Members

TokenFilter.m_input

TokenFilter.End()

TokenFilter.Dispose(Boolean)

TokenFilter.Reset()

TokenStream.Dispose()

AttributeSource.GetAttributeFactory()

AttributeSource.GetAttributeClassesEnumerator()

AttributeSource.GetAttributeImplsEnumerator()

AttributeSource.AddAttributeImpl(Attribute)

AttributeSource.AddAttribute<T>()

AttributeSource.HasAttributes

AttributeSource.HasAttribute<T>()

AttributeSource.GetAttribute<T>()

AttributeSource.ClearAttributes()

AttributeSource.CaptureState()

AttributeSource.RestoreState(AttributeSource.State)

AttributeSource.GetHashCode()

AttributeSource.Equals(Object)

AttributeSource.ReflectAsString(Boolean)

AttributeSource.ReflectWith(IAttributeReflector)

AttributeSource.CloneAttributes()

AttributeSource.CopyTo(AttributeSource)

AttributeSource.ToString()

Namespace: Lucene.Net.Analysis.Reverse

Assembly: Lucene.Net.Analysis.Common.dll

Syntax

public sealed class ReverseStringFilter : TokenFilter, IDisposable

Constructors

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ReverseStringFilter(LuceneVersion, TokenStream)

Create a new ReverseStringFilter that reverses all tokens in the supplied TokenStream.

The reversed tokens will not be marked.

Declaration

public ReverseStringFilter(LuceneVersion matchVersion, TokenStream in)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
TokenStream	in	TokenStream to filter

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ReverseStringFilter(LuceneVersion, TokenStream, Char)

Create a new ReverseStringFilter that reverses and marks all tokens in the supplied TokenStream.

The reversed tokens will be prepended (marked) by the marker character.

Declaration

public ReverseStringFilter(LuceneVersion matchVersion, TokenStream in, char marker)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
TokenStream	in	TokenStream to filter
System.Char	marker	A character used to mark reversed tokens

Fields

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INFORMATION_SEPARATOR_MARKER

Example marker character: U+001F (INFORMATION SEPARATOR ONE)

Declaration

public const char INFORMATION_SEPARATOR_MARKER = null

Field Value

Type	Description
System.Char

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PUA_EC00_MARKER

Example marker character: U+EC00 (PRIVATE USE AREA: EC00)

Declaration

public const char PUA_EC00_MARKER = null

Field Value

Type	Description
System.Char

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RTL_DIRECTION_MARKER

Example marker character: U+200F (RIGHT-TO-LEFT MARK)

Declaration

public const char RTL_DIRECTION_MARKER = null

Field Value

Type	Description
System.Char

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START_OF_HEADING_MARKER

Example marker character: U+0001 (START OF HEADING)

Declaration

public const char START_OF_HEADING_MARKER = null

Field Value

Type	Description
System.Char

Methods

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IncrementToken()

Declaration

public override bool IncrementToken()

Returns

Type	Description
System.Boolean

Overrides

TokenStream.IncrementToken()

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Reverse(LuceneVersion, Char[])

Reverses the given input buffer in-place

Declaration

public static void Reverse(LuceneVersion matchVersion, char[] buffer)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
System.Char[]	buffer	the input char array to reverse

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Reverse(LuceneVersion, Char[], Int32)

Partially reverses the given input buffer in-place from offset 0 up to the given length.

Declaration

public static void Reverse(LuceneVersion matchVersion, char[] buffer, int len)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
System.Char[]	buffer	the input char array to reverse
System.Int32	len	the length in the buffer up to where the buffer should be reversed

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Reverse(LuceneVersion, Char[], Int32, Int32)

Partially reverses the given input buffer in-place from the given offset up to the given length.

Declaration

public static void Reverse(LuceneVersion matchVersion, char[] buffer, int start, int len)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
System.Char[]	buffer	the input char array to reverse
System.Int32	start	the offset from where to reverse the buffer
System.Int32	len	the length in the buffer up to where the buffer should be reversed

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Reverse(LuceneVersion, String)

Reverses the given input string

Declaration

public static string Reverse(LuceneVersion matchVersion, string input)

Parameters

Type	Name	Description
LuceneVersion	matchVersion	lucene compatibility version
System.String	input	the string to reverse

Returns

Type	Description
System.String	the given input string in reversed order

Implements

IDisposable