Class QueryScorer

IScorer implementation which scores text fragments by the number of unique query terms found. This class converts appropriate Lucene.Net.Search.Querys to Lucene.Net.Search.Spans.SpanQuerys and attempts to score only those terms that participated in generating the 'hit' on the document.

Inheritance
System.Object
QueryScorer
Implements
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 QueryScorer : IScorer

Constructors

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QueryScorer(WeightedSpanTerm[])

Constructs a new QueryScorer instance

Declaration
public QueryScorer(WeightedSpanTerm[] weightedTerms)
Parameters
Type Name Description
WeightedSpanTerm[] weightedTerms

an array of pre-created WeightedSpanTerms
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QueryScorer(Query)

Constructs a new QueryScorer instance

Declaration
public QueryScorer(Query query)
Parameters
Type Name Description
Lucene.Net.Search.Query query

Lucene.Net.Search.Query to use for highlighting
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QueryScorer(Query, IndexReader, String)

Constructs a new QueryScorer instance

Declaration
public QueryScorer(Query query, IndexReader reader, string field)
Parameters
Type Name Description
Lucene.Net.Search.Query query

Lucene.Net.Search.Query to use for highlighting
Lucene.Net.Index.IndexReader reader

Lucene.Net.Index.IndexReader to use for quasi tf/idf scoring
System.String field

Field to highlight - pass null to ignore fields
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QueryScorer(Query, IndexReader, String, String)

Constructs a new QueryScorer instance

Declaration
public QueryScorer(Query query, IndexReader reader, string field, string defaultField)
Parameters
Type Name Description
Lucene.Net.Search.Query query

Lucene.Net.Search.Query to use for highlighting
Lucene.Net.Index.IndexReader reader

Lucene.Net.Index.IndexReader to use for quasi tf/idf scoring
System.String field

Field to highlight - pass null to ignore fields
System.String defaultField

The default field for queries with the field name unspecified
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QueryScorer(Query, String)

Constructs a new QueryScorer instance

Declaration
public QueryScorer(Query query, string field)
Parameters
Type Name Description
Lucene.Net.Search.Query query

Lucene.Net.Search.Query to use for highlighting
System.String field

Field to highlight - pass null to ignore fields
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QueryScorer(Query, String, String)

Constructs a new QueryScorer instance

Declaration
public QueryScorer(Query query, string field, string defaultField)
Parameters
Type Name Description
Lucene.Net.Search.Query query

Lucene.Net.Search.Query to use for highlighting
System.String field

Field to highlight - pass null to ignore fields
System.String defaultField

The default field for queries with the field name unspecified

Properties

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ExpandMultiTermQuery

Controls whether or not multi-term queries are expanded against a Lucene.Net.Index.Memory.MemoryIndex Lucene.Net.Index.IndexReader. true if multi-term queries should be expanded

Declaration
public virtual bool ExpandMultiTermQuery { get; set; }
Property Value
Type Description
System.Boolean
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FragmentScore

Declaration
public virtual float FragmentScore { get; }
Property Value
Type Description
System.Single
See Also
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MaxTermWeight

The highest weighted term (useful for passing to GradientFormatter to set top end of coloring scale).

Declaration
public virtual float MaxTermWeight { get; }
Property Value
Type Description
System.Single

Methods

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GetTokenScore()

Declaration
public virtual float GetTokenScore()
Returns
Type Description
System.Single
See Also
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GetWeightedSpanTerm(String)

Retrieve the WeightedSpanTerm for the specified token. Useful for passing Span information to a IFragmenter.

Declaration
public virtual WeightedSpanTerm GetWeightedSpanTerm(string token)
Parameters
Type Name Description
System.String token

token to get WeightedSpanTerm for
Returns
Type Description
WeightedSpanTerm

WeightedSpanTerm for token
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Init(TokenStream)

Declaration
public virtual TokenStream Init(TokenStream tokenStream)
Parameters
Type Name Description
Lucene.Net.Analysis.TokenStream tokenStream
Returns
Type Description
Lucene.Net.Analysis.TokenStream
See Also
Init(Lucene.Net.Analysis.TokenStream)
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NewTermExtractor(String)

Declaration
protected virtual WeightedSpanTermExtractor NewTermExtractor(string defaultField)
Parameters
Type Name Description
System.String defaultField
Returns
Type Description
WeightedSpanTermExtractor
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SetMaxDocCharsToAnalyze(Int32)

Declaration
public virtual 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 ensure an efficient reset - if you are already using a different caching 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
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StartFragment(TextFragment)

Declaration
public virtual void StartFragment(TextFragment newFragment)
Parameters
Type Name Description
TextFragment newFragment
See Also

Implements