Class DefaultPostingsFormatFactory

LUCENENET specific class that implements the default functionality for the IPostingsFormatFactory.

The most common use cases are:

• Initialize DefaultPostingsFormatFactory with a set of CustomPostingsFormatTypes.
• Subclass DefaultPostingsFormatFactory and override GetPostingsFormat(Type) so an external dependency injection container can be used to supply the instances (lifetime should be singleton). Note that you could alternately use the "named type" feature that many DI containers have to supply the type based on name by overriding GetPostingsFormat(String).
• Subclass DefaultPostingsFormatFactory and override GetPostingsFormatType(String) so a type new type can be supplied that is not in the Lucene.Net.Codecs.DefaultPostingsFormatFactory.postingsFormatNameToTypeMap.
• Subclass DefaultPostingsFormatFactory to add new or override the default PostingsFormat types by overriding Initialize() and calling PutPostingsFormatType(Type).
• Subclass DefaultPostingsFormatFactory to scan additional assemblies for PostingsFormat subclasses in by overriding Initialize() and calling ScanForPostingsFormats(Assembly). For performance reasons, the default behavior only loads Lucene.Net codecs.

To set the IPostingsFormatFactory, call SetPostingsFormatFactory(IPostingsFormatFactory).

Inheritance

System.Object

NamedServiceFactory<PostingsFormat>

DefaultPostingsFormatFactory

Implements

IPostingsFormatFactory

IServiceListable

Inherited Members

NamedServiceFactory<PostingsFormat>.m_initializationLock

NamedServiceFactory<PostingsFormat>.EnsureInitialized()

NamedServiceFactory<PostingsFormat>.CodecsAssembly

NamedServiceFactory<PostingsFormat>.IsServiceType(Type)

NamedServiceFactory<PostingsFormat>.GetServiceName(Type)

NamedServiceFactory<PostingsFormat>.GetCanonicalName(Type)

NamedServiceFactory<PostingsFormat>.IsFullyTrusted

Namespace: Lucene.Net.Codecs

Assembly: Lucene.Net.dll

Syntax

public class DefaultPostingsFormatFactory : NamedServiceFactory<PostingsFormat>, IPostingsFormatFactory, IServiceListable

Constructors

DefaultPostingsFormatFactory()

Creates a new instance of DefaultPostingsFormatFactory.

Declaration

public DefaultPostingsFormatFactory()

Properties

AvailableServices

Gets a list of the available PostingsFormats (by name).

Declaration

public virtual ICollection<string> AvailableServices { get; }

Property Value

Type	Description
ICollection<System.String>	A ICollection{string} of PostingsFormat names.

CustomPostingsFormatTypes

An array of custom PostingsFormat-derived types to be registered. This property can be initialized during construction of DefaultPostingsFormatFactory to make your custom codecs known to Lucene.

These types will be registered after the default Lucene types, so if a custom type has the same name as a Lucene PostingsFormat (via PostingsFormatNameAttribute) the custom type will replace the Lucene type with the same name.

Declaration

public IEnumerable<Type> CustomPostingsFormatTypes { get; set; }

Property Value

Type	Description
IEnumerable<Type>

Methods

GetPostingsFormat(String)

Gets the PostingsFormat instance from the provided name.

Declaration

public virtual PostingsFormat GetPostingsFormat(string name)

Parameters

Type	Name	Description
System.String	name	The name of the PostingsFormat instance to retrieve.

Returns

Type	Description
PostingsFormat	The PostingsFormat instance.

GetPostingsFormat(Type)

Gets the PostingsFormat instance from the provided type.

Declaration

protected virtual PostingsFormat GetPostingsFormat(Type type)

Parameters

Type	Name	Description
Type	type	The of PostingsFormat to retrieve.

Returns

Type	Description
PostingsFormat	The PostingsFormat instance.

GetPostingsFormatType(String)

Gets the PostingsFormat from the provided name.

Declaration

protected virtual Type GetPostingsFormatType(string name)

Parameters

Type	Name	Description
System.String	name	The name of the PostingsFormat to retrieve.

Returns

Type	Description
Type	The PostingsFormat .

Initialize()

Initializes the codec type cache with the known PostingsFormat types. Override this method (and optionally call base.Initialize()) to add your own PostingsFormat types by calling PutPostingsFormatType(Type) or ScanForPostingsFormats(Assembly).

If two types have the same name by using the PostingsFormatNameAttribute, the last one registered wins.

Declaration

protected override void Initialize()

Overrides

Lucene.Net.Util.NamedServiceFactory<Lucene.Net.Codecs.PostingsFormat>.Initialize()

NewPostingsFormat(Type)

Instantiates a PostingsFormat based on the provided type.

Declaration

protected virtual PostingsFormat NewPostingsFormat(Type type)

Parameters

Type	Name	Description
Type	type	The of PostingsFormat to instantiate.

Returns

Type	Description
PostingsFormat	The new instance.

PutPostingsFormatType(Type)

Adds a PostingsFormat type to the Lucene.Net.Codecs.DefaultPostingsFormatFactory.postingsFormatNameToTypeMap, using the name provided in the PostingsFormatNameAttribute, if present, or the name of the codec class minus the "Codec" suffix as the name by default.

Note that if a PostingsFormat with the same name already exists in the map, calling this method will update it to the new type.

Declaration

protected virtual void PutPostingsFormatType(Type postingsFormat)

Parameters

Type	Name	Description
Type	postingsFormat	A type that subclasses PostingsFormat.

ScanForPostingsFormats(Assembly)

Scans the given assembly for subclasses of PostingsFormat and adds their names to the Lucene.Net.Codecs.DefaultPostingsFormatFactory.postingsFormatNameToTypeMap. Note that names will be automatically overridden if the PostingsFormat name appears multiple times - the last match wins.

Declaration

protected virtual void ScanForPostingsFormats(Assembly assembly)

Parameters

Type	Name	Description
Assembly	assembly	The assembly to scan.

ScanForPostingsFormats(IEnumerable<Assembly>)

Scans the given assemblies for subclasses of Codec and adds their names to the Lucene.Net.Codecs.DefaultPostingsFormatFactory.postingsFormatNameToTypeMap. Note that names will be automatically overridden if the PostingsFormat name appears multiple times - the last match wins.

Declaration

protected virtual void ScanForPostingsFormats(IEnumerable<Assembly> assemblies)

Parameters

Type	Name	Description
IEnumerable<Assembly>	assemblies	A list of assemblies to scan. The assemblies will be scanned from first to last, and the last match for each PostingsFormat name wins.

Implements

IPostingsFormatFactory

IServiceListable