Class DirectoryTaxonomyReader

A TaxonomyReader which retrieves stored taxonomy information from a Lucene.Net.Store.Directory.

Reading from the on-disk index on every method call is too slow, so this implementation employs caching: Some methods cache recent requests and their results, while other methods prefetch all the data into memory and then provide answers directly from in-memory tables. See the documentation of individual methods for comments on their performance.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
TaxonomyReader
DirectoryTaxonomyReader
Implements
System.IDisposable
Inherited Members
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)
System.Object.ToString()
Namespace: Lucene.Net.Facet.Taxonomy.Directory
Assembly: Lucene.Net.Facet.dll
Syntax
public class DirectoryTaxonomyReader : TaxonomyReader, IDisposable

Constructors

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DirectoryTaxonomyReader(DirectoryTaxonomyWriter)

Opens a DirectoryTaxonomyReader over the given DirectoryTaxonomyWriter (for NRT).

Declaration
public DirectoryTaxonomyReader(DirectoryTaxonomyWriter taxoWriter)
Parameters
Type Name Description
DirectoryTaxonomyWriter taxoWriter

The DirectoryTaxonomyWriter from which to obtain newly added categories, in real-time.

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DirectoryTaxonomyReader(Directory)

Open for reading a taxonomy stored in a given Lucene.Net.Store.Directory.

Declaration
public DirectoryTaxonomyReader(Directory directory)
Parameters
Type Name Description
Lucene.Net.Store.Directory directory

The Lucene.Net.Store.Directory in which the taxonomy resides.

Exceptions
Type Condition
CorruptIndexException

if the Taxonomy is corrupt.

System.IO.IOException

if another error occurred.

Properties

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CommitUserData

Declaration
public override IDictionary<string, string> CommitUserData { get; }
Property Value
Type Description
System.Collections.Generic.IDictionary<System.String, System.String>
Overrides
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Count

Declaration
public override int Count { get; }
Property Value
Type Description
System.Int32
Overrides
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ParallelTaxonomyArrays

Declaration
public override ParallelTaxonomyArrays ParallelTaxonomyArrays { get; }
Property Value
Type Description
ParallelTaxonomyArrays
Overrides

Methods

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DoClose()

Declaration
protected override void DoClose()
Overrides
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DoOpenIfChanged()

Implements the opening of a new DirectoryTaxonomyReader instance if the taxonomy has changed.

NOTE: the returned DirectoryTaxonomyReader shares the ordinal and category caches with this reader. This is not expected to cause any issues, unless the two instances continue to live. The reader guarantees that the two instances cannot affect each other in terms of correctness of the caches, however if the size of the cache is changed through SetCacheSize(Int32), it will affect both reader instances.

Declaration
protected override TaxonomyReader DoOpenIfChanged()
Returns
Type Description
TaxonomyReader
Overrides
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GetOrdinal(FacetLabel)

Declaration
public override int GetOrdinal(FacetLabel cp)
Parameters
Type Name Description
FacetLabel cp
Returns
Type Description
System.Int32
Overrides
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GetPath(Int32)

Declaration
public override FacetLabel GetPath(int ordinal)
Parameters
Type Name Description
System.Int32 ordinal
Returns
Type Description
FacetLabel
Overrides
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OpenIndexReader(IndexWriter)

Open the Lucene.Net.Index.DirectoryReader from this Lucene.Net.Index.IndexWriter.

Declaration
protected virtual DirectoryReader OpenIndexReader(IndexWriter writer)
Parameters
Type Name Description
Lucene.Net.Index.IndexWriter writer
Returns
Type Description
Lucene.Net.Index.DirectoryReader
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OpenIndexReader(Directory)

Open the Lucene.Net.Index.DirectoryReader from this Lucene.Net.Store.Directory.

Declaration
protected virtual DirectoryReader OpenIndexReader(Directory directory)
Parameters
Type Name Description
Lucene.Net.Store.Directory directory
Returns
Type Description
Lucene.Net.Index.DirectoryReader
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SetCacheSize(Int32)

SetCacheSize(Int32) controls the maximum allowed size of each of the caches used by GetPath(Int32) and GetOrdinal(FacetLabel).

Currently, if the given size is smaller than the current size of a cache, it will not shrink, and rather we be limited to its current size.

Declaration
public virtual void SetCacheSize(int size)
Parameters
Type Name Description
System.Int32 size

the new maximum cache size, in number of entries.

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ToString(Int32)

Returns ordinal -> label mapping, up to the provided max ordinal or number of ordinals, whichever is smaller.

Declaration
public virtual string ToString(int max)
Parameters
Type Name Description
System.Int32 max
Returns
Type Description
System.String

Implements

System.IDisposable