public ServiceProviderCodecFactory(IServiceProvider serviceProvider)
{
this.serviceProvider = serviceProvider ?? throw new ArgumentNullException(nameof(serviceProvider));
// Get the registered service collection, which can be used to get a list of registered types
var serviceCollection = serviceProvider.GetService <IServiceCollection>();
// Retrieve a list of registered types that subclass Codec. Codecs must be registered by
// their concrete type so we can differentiate between them later when calling GetService().
this.codecTypes = serviceCollection
.Where(t => typeof(Codec).IsAssignableFrom(t.ServiceType))
.ToDictionary(
t => NamedServiceFactory <Codec> .GetServiceName(t.ImplementationType),
t => t.ImplementationType
);
}
/// <summary>
/// Creates a new codec.
/// <para/>
/// The <see cref="Codec.Name"/> will be written into the index segment: in order for
/// the segment to be read this class should be registered by subclassing <see cref="DefaultCodecFactory"/> and
/// calling <see cref="DefaultCodecFactory.ScanForCodecs(System.Reflection.Assembly)"/> in the class constructor.
/// The new <see cref="ICodecFactory"/> can be registered by calling <see cref="SetCodecFactory"/> at application startup.</summary>
protected Codec()
{
name = NamedServiceFactory <Codec> .GetServiceName(this.GetType());
}
/// <summary>
/// Creates a new docvalues format.
/// <para/>
/// The provided name will be written into the index segment in some configurations
/// (such as when using <see cref="Codecs.PerField.PerFieldDocValuesFormat"/>): in such configurations,
/// for the segment to be read this class should be registered by subclassing <see cref="DefaultDocValuesFormatFactory"/> and
/// calling <see cref="DefaultDocValuesFormatFactory.ScanForDocValuesFormats(System.Reflection.Assembly)"/> in the class constructor.
/// The new <see cref="IDocValuesFormatFactory"/> can be registered by calling <see cref="SetDocValuesFormatFactory(IDocValuesFormatFactory)"/>
/// at application startup.
/// </summary>
protected DocValuesFormat()
{
this.name = NamedServiceFactory <DocValuesFormat> .GetServiceName(this.GetType());
}
/// <summary>
/// Creates a new postings format.
/// <para/>
/// The provided name will be written into the index segment in some configurations
/// (such as when using <see cref="PerField.PerFieldPostingsFormat"/>): in such configurations,
/// for the segment to be read this class should be registered by subclassing <see cref="DefaultPostingsFormatFactory"/> and
/// calling <see cref="DefaultPostingsFormatFactory.ScanForPostingsFormats(System.Reflection.Assembly)"/> in the class constructor.
/// The new <see cref="IPostingsFormatFactory"/> can be registered by calling <see cref="SetPostingsFormatFactory(IPostingsFormatFactory)"/> at application startup.</summary>
protected PostingsFormat()
{
this.name = NamedServiceFactory <PostingsFormat> .GetServiceName(this.GetType());
}