Class QueryTermExtractor

Utility class used to extract the terms used in a query, plus any weights. This class will not find terms for , RangeQuery and classes so the caller must pass a rewritten query (see ) to obtain a list of expanded terms.

Inheritance

System.Object

QueryTermExtractor

Namespace: Lucene.Net.Search.Highlight

Assembly: Lucene.Net.Highlighter.dll

Syntax

public static class QueryTermExtractor : object

Methods

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GetIdfWeightedTerms(Query, IndexReader, String)

Extracts all terms texts of a given into an array of WeightedTerms

Declaration

public static WeightedTerm[] GetIdfWeightedTerms(Query query, IndexReader reader, string fieldName)

Parameters

Type	Name	Description
Query	query	to extract term texts from
IndexReader	reader	used to compute IDF which can be used to a) score selected fragments better b) use graded highlights eg chaning intensity of font color
System.String	fieldName	the field on which Inverse Document Frequency (IDF) calculations are based

Returns

Type	Description
WeightedTerm[]	an array of the terms used in a query, plus their weights.

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GetTerms(Query)

Extracts all terms texts of a given into an array of WeightedTerms

Declaration

public static WeightedTerm[] GetTerms(Query query)

Parameters

Type	Name	Description
Query	query	to extract term texts from

Returns

Type	Description
WeightedTerm[]	an array of the terms used in a query, plus their weights.

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GetTerms(Query, Boolean)

Extracts all terms texts of a given into an array of WeightedTerms

Declaration

public static WeightedTerm[] GetTerms(Query query, bool prohibited)

Parameters

Type	Name	Description
Query	query	to extract term texts from
System.Boolean	prohibited	`true` to extract "prohibited" terms, too

Returns

Type	Description
WeightedTerm[]	an array of the terms used in a query, plus their weights.

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GetTerms(Query, Boolean, String)

Extracts all terms texts of a given into an array of WeightedTerms

Declaration

public static WeightedTerm[] GetTerms(Query query, bool prohibited, string fieldName)

Parameters

Type	Name	Description
Query	query	to extract term texts from
System.Boolean	prohibited	`true` to extract "prohibited" terms, too
System.String	fieldName	The fieldName used to filter query terms

Returns

Type	Description
WeightedTerm[]	an array of the terms used in a query, plus their weights.