Class SegmentInfo

Information about a segment such as it's name, directory, and files related to the segment.

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

Inheritance

System.Object

SegmentInfo

Namespace: Lucene.Net.Index

Assembly: Lucene.Net.dll

Syntax

public sealed class SegmentInfo : object

Constructors

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SegmentInfo(Directory, String, String, Int32, Boolean, Codec, IDictionary<String, String>)

Construct a new complete SegmentInfo instance from input.

Note: this is public only to allow access from the codecs package.

Declaration

public SegmentInfo(Directory dir, string version, string name, int docCount, bool isCompoundFile, Codec codec, IDictionary<string, string> diagnostics)

Parameters

Type	Name	Description
Directory	dir
System.String	version
System.String	name
System.Int32	docCount
System.Boolean	isCompoundFile
Codec	codec
IDictionary<System.String, System.String>	diagnostics

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SegmentInfo(Directory, String, String, Int32, Boolean, Codec, IDictionary<String, String>, IDictionary<String, String>)

Construct a new complete SegmentInfo instance from input.

Note: this is public only to allow access from the codecs package.

Declaration

public SegmentInfo(Directory dir, string version, string name, int docCount, bool isCompoundFile, Codec codec, IDictionary<string, string> diagnostics, IDictionary<string, string> attributes)

Parameters

Type	Name	Description
Directory	dir
System.String	version
System.String	name
System.Int32	docCount
System.Boolean	isCompoundFile
Codec	codec
IDictionary<System.String, System.String>	diagnostics
IDictionary<System.String, System.String>	attributes

Fields

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NO

Used by some member fields to mean not present (e.g., norms, deletions).

Declaration

public static readonly int NO

Field Value

Type	Description
System.Int32

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YES

Used by some member fields to mean present (e.g., norms, deletions).

Declaration

public static readonly int YES

Field Value

Type	Description
System.Int32

Properties

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Attributes

Returns the internal codec attributes map. May be null if no mappings exist.

Declaration

public IDictionary<string, string> Attributes { get; }

Property Value

Type	Description
IDictionary<System.String, System.String>

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Codec

Gets or Sets Codec that wrote this segment. Setter can only be called once.

Declaration

public Codec Codec { get; set; }

Property Value

Type	Description
Codec

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Diagnostics

Gets or Sets diagnostics saved into the segment when it was written.

Declaration

public IDictionary<string, string> Diagnostics { get; set; }

Property Value

Type	Description
IDictionary<System.String, System.String>

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Dir

Where this segment resides.

Declaration

public Directory Dir { get; }

Property Value

Type	Description
Directory

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DocCount

Returns number of documents in this segment (deletions are not taken into account).

Declaration

public int DocCount { get; }

Property Value

Type	Description
System.Int32

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Name

Unique segment name in the directory.

Declaration

public string Name { get; }

Property Value

Type	Description
System.String

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UseCompoundFile

Gets or Sets whether this segment is stored as a compound file. true if this is a compound file; else, false

Declaration

public bool UseCompoundFile { get; set; }

Property Value

Type	Description
System.Boolean

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Version

Used by DefaultSegmentInfosReader to upgrade a 3.0 segment to record its version is "3.0". this method can be removed when we're not required to support 3x indexes anymore, e.g. in 5.0.

NOTE: this method is used for internal purposes only - you should not modify the version of a SegmentInfo, or it may result in unexpected exceptions thrown when you attempt to open the index.

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

Declaration

public string Version { get; set; }

Property Value

Type	Description
System.String

Methods

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AddFile(String)

Add this file to the set of files written for this segment.

Declaration

public void AddFile(string file)

Parameters

Type	Name	Description
System.String	file

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AddFiles(ICollection<String>)

Add these files to the set of files written for this segment.

Declaration

public void AddFiles(ICollection<string> files)

Parameters

Type	Name	Description
ICollection<System.String>	files

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Equals(Object)

We consider another SegmentInfo instance equal if it has the same dir and same name.

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
System.Object	obj

Returns

Type	Description
System.Boolean

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GetAttribute(String)

Get a codec attribute value, or null if it does not exist

Declaration

public string GetAttribute(string key)

Parameters

Type	Name	Description
System.String	key

Returns

Type	Description
System.String

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GetFiles()

Return all files referenced by this SegmentInfo.

Declaration

public ISet<string> GetFiles()

Returns

Type	Description
ISet<System.String>

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GetHashCode()

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32

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PutAttribute(String, String)

Puts a codec attribute value.

This is a key-value mapping for the field that the codec can use to store additional metadata, and will be available to the codec when reading the segment via GetAttribute(String)

If a value already exists for the field, it will be replaced with the new value.

Declaration

public string PutAttribute(string key, string value)

Parameters

Type	Name	Description
System.String	key
System.String	value

Returns

Type	Description
System.String

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SetFiles(ISet<String>)

Sets the files written for this segment.

Declaration

public void SetFiles(ISet<string> files)

Parameters

Type	Name	Description
ISet<System.String>	files

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ToString()

Declaration

public override string ToString()

Returns

Type	Description
System.String

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ToString(Directory, Int32)

Used for debugging. Format may suddenly change.

Current format looks like _a(3.1):c45/4, which means the segment's name is _a; it was created with Lucene 3.1 (or '?' if it's unknown); it's using compound file format (would be C if not compound); it has 45 documents; it has 4 deletions (this part is left off when there are no deletions).

Declaration

public string ToString(Directory dir, int delCount)

Parameters

Type	Name	Description
Directory	dir
System.Int32	delCount

Returns

Type	Description
System.String