Class WeightedSpanTermExtractor

Class used to extract WeightedSpanTerms from a Lucene.Net.Search.Query based on whether Terms from the Lucene.Net.Search.Query are contained in a supplied Lucene.Net.Analysis.TokenStream.

Inheritance

System.Object

WeightedSpanTermExtractor

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.Search.Highlight

Assembly: Lucene.Net.Highlighter.dll

Syntax

public class WeightedSpanTermExtractor

Constructors

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WeightedSpanTermExtractor()

Declaration

public WeightedSpanTermExtractor()

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WeightedSpanTermExtractor(String)

Declaration

public WeightedSpanTermExtractor(string defaultField)

Parameters

Type	Name	Description
System.String	defaultField

Properties

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ExpandMultiTermQuery

Declaration

public virtual bool ExpandMultiTermQuery { get; set; }

Property Value

Type	Description
System.Boolean

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IsCachedTokenStream

Declaration

public virtual bool IsCachedTokenStream { get; }

Property Value

Type	Description
System.Boolean

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TokenStream

Declaration

public virtual TokenStream TokenStream { get; }

Property Value

Type	Description
Lucene.Net.Analysis.TokenStream

Methods

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CollectSpanQueryFields(SpanQuery, ISet<String>)

Declaration

protected virtual void CollectSpanQueryFields(SpanQuery spanQuery, ISet<string> fieldNames)

Parameters

Type	Name	Description
Lucene.Net.Search.Spans.SpanQuery	spanQuery
System.Collections.Generic.ISet<System.String>	fieldNames

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Extract(Query, IDictionary<String, WeightedSpanTerm>)

Fills a with WeightedSpanTerms using the terms from the supplied query.

Declaration

protected virtual void Extract(Query query, IDictionary<string, WeightedSpanTerm> terms)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	Lucene.Net.Search.Query to extract Terms from
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	terms	Map to place created WeightedSpanTerms in

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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ExtractUnknownQuery(Query, IDictionary<String, WeightedSpanTerm>)

Declaration

protected virtual void ExtractUnknownQuery(Query query, IDictionary<string, WeightedSpanTerm> terms)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	terms

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ExtractWeightedSpanTerms(IDictionary<String, WeightedSpanTerm>, SpanQuery)

Fills a with WeightedSpanTerms using the terms from the supplied Lucene.Net.Search.Spans.SpanQuery.

Declaration

protected virtual void ExtractWeightedSpanTerms(IDictionary<string, WeightedSpanTerm> terms, SpanQuery spanQuery)

Parameters

Type	Name	Description
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	terms	to place created WeightedSpanTerms in
Lucene.Net.Search.Spans.SpanQuery	spanQuery	Lucene.Net.Search.Spans.SpanQuery to extract Terms from

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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ExtractWeightedTerms(IDictionary<String, WeightedSpanTerm>, Query)

Fills a with WeightedSpanTerms using the terms from the supplied Lucene.Net.Search.Spans.SpanQuery.

Declaration

protected virtual void ExtractWeightedTerms(IDictionary<string, WeightedSpanTerm> terms, Query query)

Parameters

Type	Name	Description
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	terms	to place created WeightedSpanTerms in
Lucene.Net.Search.Query	query	Lucene.Net.Search.Query to extract Terms from

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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FieldNameComparer(String)

Necessary to implement matches for queries against Lucene.Net.Search.Highlight.WeightedSpanTermExtractor.defaultField

Declaration

protected virtual bool FieldNameComparer(string fieldNameToCheck)

Parameters

Type	Name	Description
System.String	fieldNameToCheck

Returns

Type	Description
System.Boolean

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GetLeafContext()

Declaration

protected virtual AtomicReaderContext GetLeafContext()

Returns

Type	Description
Lucene.Net.Index.AtomicReaderContext

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GetWeightedSpanTerms(Query, TokenStream)

Creates an from the given Lucene.Net.Search.Query and Lucene.Net.Analysis.TokenStream.

Declaration

public virtual IDictionary<string, WeightedSpanTerm> GetWeightedSpanTerms(Query query, TokenStream tokenStream)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	Lucene.Net.Search.Query that caused hit
Lucene.Net.Analysis.TokenStream	tokenStream	Lucene.Net.Analysis.TokenStream of text to be highlighted

Returns

Type	Description
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	Map containing WeightedSpanTerms

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetWeightedSpanTerms(Query, TokenStream, String)

Creates an from the given Lucene.Net.Search.Query and Lucene.Net.Analysis.TokenStream.

Declaration

public virtual IDictionary<string, WeightedSpanTerm> GetWeightedSpanTerms(Query query, TokenStream tokenStream, string fieldName)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	Lucene.Net.Search.Query that caused hit
Lucene.Net.Analysis.TokenStream	tokenStream	Lucene.Net.Analysis.TokenStream of text to be highlighted
System.String	fieldName	restricts Term's used based on field name

Returns

Type	Description
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	Map containing WeightedSpanTerms

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetWeightedSpanTermsWithScores(Query, TokenStream, String, IndexReader)

Creates an from the given Lucene.Net.Search.Query and Lucene.Net.Analysis.TokenStream. Uses a supplied Lucene.Net.Index.IndexReader to properly Weight terms (for gradient highlighting).

Declaration

public virtual IDictionary<string, WeightedSpanTerm> GetWeightedSpanTermsWithScores(Query query, TokenStream tokenStream, string fieldName, IndexReader reader)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	Lucene.Net.Search.Query that caused hit
Lucene.Net.Analysis.TokenStream	tokenStream	Lucene.Net.Analysis.TokenStream of text to be highlighted
System.String	fieldName	restricts Term's used based on field name
Lucene.Net.Index.IndexReader	reader	to use for scoring

Returns

Type	Description
System.Collections.Generic.IDictionary<System.String, WeightedSpanTerm>	Map of WeightedSpanTerms with quasi tf/idf scores

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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MustRewriteQuery(SpanQuery)

Declaration

protected virtual bool MustRewriteQuery(SpanQuery spanQuery)

Parameters

Type	Name	Description
Lucene.Net.Search.Spans.SpanQuery	spanQuery

Returns

Type	Description
System.Boolean

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SetMaxDocCharsToAnalyze(Int32)

Declaration

protected void SetMaxDocCharsToAnalyze(int maxDocCharsToAnalyze)

Parameters

Type	Name	Description
System.Int32	maxDocCharsToAnalyze

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SetWrapIfNotCachingTokenFilter(Boolean)

By default, Lucene.Net.Analysis.TokenStreams that are not of the type CachingTokenFilter are wrapped in a CachingTokenFilter to Lucene.Net.Analysis.TokenStream impl and you don't want it to be wrapped, set this to false.

Declaration

public virtual void SetWrapIfNotCachingTokenFilter(bool wrap)

Parameters

Type	Name	Description
System.Boolean	wrap