Class CompoundFileDirectory

Class for accessing a compound stream. This class implements a directory, but is limited to only read operations. Directory methods that would normally modify data throw an exception.

All files belonging to a segment have the same name with varying extensions. The extensions correspond to the different file formats used by the Codec. When using the Compound File format these files are collapsed into a single .cfs file (except for the LiveDocsFormat, with a corresponding .cfe file indexing its sub-files.

Files:

.cfs: An optional "virtual" file consisting of all the other index files for systems that frequently run out of file handles.
.cfe: The "virtual" compound file's entry table holding all entries in the corresponding .cfs file.

Description:

Compound (.cfs) --> Header, FileData ^FileCount
Compound Entry Table (.cfe) --> Header, FileCount, <FileName, DataOffset, DataLength> ^FileCount, Footer
Header --> WriteHeader(DataOutput, String, Int32)
FileCount --> WriteVInt32(Int32)
DataOffset,DataLength --> WriteInt64(Int64)
FileName --> WriteString(String)
FileData --> raw file data
Footer --> WriteFooter(IndexOutput)

Notes:

FileCount indicates how many files are contained in this compound file. The entry table that follows has that many entries.
Each directory entry contains a long pointer to the start of this file's data section, the files length, and a System.String with that file's name.

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

Inheritance

System.Object

Implements

System.IDisposable

Inherited Members

BaseDirectory.IsOpen

BaseDirectory.m_lockFactory

BaseDirectory.ClearLock(String)

BaseDirectory.SetLockFactory(LockFactory)

BaseDirectory.LockFactory

BaseDirectory.EnsureOpen()

Directory.OpenChecksumInput(String, IOContext)

Directory.Dispose()

Directory.GetLockID()

Directory.Copy(Directory, String, String, IOContext)

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.Store

Assembly: Lucene.Net.dll

Syntax

public sealed class CompoundFileDirectory : BaseDirectory, IDisposable

Constructors

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CompoundFileDirectory(Directory, String, IOContext, Boolean)

Create a new CompoundFileDirectory.

Declaration

public CompoundFileDirectory(Directory directory, string fileName, IOContext context, bool openForWrite)

Parameters

Type	Name	Description
Directory	directory
System.String	fileName
IOContext	context
System.Boolean	openForWrite

Properties

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Type	Description
Directory

Name

Declaration

public string Name { get; }

Property Value

Type	Description
System.String

Methods

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CreateOutput(String, IOContext)

Declaration

public override IndexOutput CreateOutput(string name, IOContext context)

Parameters

Type	Name	Description
System.String	name
IOContext	context

Returns

Type	Description
IndexOutput

Overrides

Directory.CreateOutput(String, IOContext)

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CreateSlicer(String, IOContext)

Declaration

public override Directory.IndexInputSlicer CreateSlicer(string name, IOContext context)

Parameters

Type	Name	Description
System.String	name
IOContext	context

Returns

Type	Description
Directory.IndexInputSlicer

Overrides

Directory.CreateSlicer(String, IOContext)

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DeleteFile(String)

Not implemented

Declaration

public override void DeleteFile(string name)

Parameters

Type	Name	Description
System.String	name

Overrides

Directory.DeleteFile(String)

Exceptions

Type	Condition
System.NotSupportedException	always: not supported by CFS

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Dispose(Boolean)

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing

Overrides

Directory.Dispose(Boolean)

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FileExists(String)

Returns true iff a file with the given name exists.

Declaration

[Obsolete("this method will be removed in 5.0")]
public override bool FileExists(string name)

Parameters

Type	Name	Description
System.String	name

Returns

Type	Description
System.Boolean

Overrides

Directory.FileExists(String)

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FileLength(String)

Returns the length of a file in the directory.

Declaration

public override long FileLength(string name)

Parameters

Type	Name	Description
System.String	name

Returns

Type	Description
System.Int64

Overrides

Directory.FileLength(String)

Exceptions

Type	Condition
System.IO.IOException	if the file does not exist

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ListAll()

Returns an array of strings, one for each file in the directory.

Declaration

public override string[] ListAll()

Returns

Type	Description
System.String[]

Overrides

Directory.ListAll()

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MakeLock(String)

Not implemented

Declaration

public override Lock MakeLock(string name)

Parameters

Type	Name	Description
System.String	name

Returns

Type	Description
Lock

Overrides

BaseDirectory.MakeLock(String)

Exceptions

Type	Condition
System.NotSupportedException	always: not supported by CFS

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OpenInput(String, IOContext)

Declaration

public override IndexInput OpenInput(string name, IOContext context)

Parameters

Type	Name	Description
System.String	name
IOContext	context

Returns

Type	Description
IndexInput

Overrides

Directory.OpenInput(String, IOContext)

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RenameFile(String, String)

Not implemented

Declaration

public void RenameFile(string from, string to)

Parameters

Type	Name	Description
System.String	from
System.String	to

Exceptions

Type	Condition
System.NotSupportedException	always: not supported by CFS

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Sync(ICollection<String>)

Declaration

public override void Sync(ICollection<string> names)

Parameters

Type	Name	Description
System.Collections.Generic.ICollection<System.String>	names

Overrides

Directory.Sync(ICollection<String>)

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ToString()

Declaration

public override string ToString()

Returns

Type	Description
System.String

Overrides

Directory.ToString()

Implements

System.IDisposable