Class BlendedInfixSuggester

Extension of the AnalyzingInfixSuggester which transforms the weight after search to take into account the position of the searched term into the indexed text. Please note that it increases the number of elements searched and applies the ponderation after. It might be costly for long suggestions.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
Lookup
AnalyzingInfixSuggester
BlendedInfixSuggester
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.Search.Suggest.Analyzing
Assembly: Lucene.Net.Suggest.dll
Syntax
public class BlendedInfixSuggester : AnalyzingInfixSuggester, IDisposable

Constructors

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BlendedInfixSuggester(LuceneVersion, Directory, Analyzer)

Create a new instance, loading from a previously built directory, if it exists.

Declaration
public BlendedInfixSuggester(LuceneVersion matchVersion, Directory dir, Analyzer analyzer)
Parameters
Type Name Description
LuceneVersion matchVersion
Directory dir
Analyzer analyzer
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BlendedInfixSuggester(LuceneVersion, Directory, Analyzer, Analyzer, Int32, BlendedInfixSuggester.BlenderType, Int32)

Create a new instance, loading from a previously built directory, if it exists.

Declaration
public BlendedInfixSuggester(LuceneVersion matchVersion, Directory dir, Analyzer indexAnalyzer, Analyzer queryAnalyzer, int minPrefixChars, BlendedInfixSuggester.BlenderType blenderType, int numFactor)
Parameters
Type Name Description
LuceneVersion matchVersion
Directory dir
Analyzer indexAnalyzer
Analyzer queryAnalyzer
System.Int32 minPrefixChars
BlendedInfixSuggester.BlenderType blenderType

Type of blending strategy, see BlenderType for more precisions

System.Int32 numFactor

Factor to multiply the number of searched elements before ponderate

Exceptions
Type Condition
System.IO.IOException

If there are problems opening the underlying Lucene index.

Fields

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DEFAULT_NUM_FACTOR

Default factor

Declaration
public static int DEFAULT_NUM_FACTOR
Field Value
Type Description
System.Int32
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LINEAR_COEF

Coefficient used for linear blending

Declaration
protected static double LINEAR_COEF
Field Value
Type Description
System.Double

Methods

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CalculateCoefficient(Int32)

Calculate the weight coefficient based on the position of the first matching word. Subclass should override it to adapt it to particular needs

Declaration
protected virtual double CalculateCoefficient(int position)
Parameters
Type Name Description
System.Int32 position

of the first matching word in text

Returns
Type Description
System.Double

the coefficient

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CreateResults(IndexSearcher, TopFieldDocs, Int32, String, Boolean, IEnumerable<String>, String)

Declaration
protected override IList<Lookup.LookupResult> CreateResults(IndexSearcher searcher, TopFieldDocs hits, int num, string key, bool doHighlight, IEnumerable<string> matchedTokens, string prefixToken)
Parameters
Type Name Description
IndexSearcher searcher
TopFieldDocs hits
System.Int32 num
System.String key
System.Boolean doHighlight
System.Collections.Generic.IEnumerable<System.String> matchedTokens
System.String prefixToken
Returns
Type Description
System.Collections.Generic.IList<Lookup.LookupResult>
Overrides
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DoLookup(String, IEnumerable<BytesRef>, Boolean, Int32)

Declaration
public override IList<Lookup.LookupResult> DoLookup(string key, IEnumerable<BytesRef> contexts, bool onlyMorePopular, int num)
Parameters
Type Name Description
System.String key
System.Collections.Generic.IEnumerable<BytesRef> contexts
System.Boolean onlyMorePopular
System.Int32 num
Returns
Type Description
System.Collections.Generic.IList<Lookup.LookupResult>
Overrides
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DoLookup(String, IEnumerable<BytesRef>, Int32, Boolean, Boolean)

Declaration
public override IList<Lookup.LookupResult> DoLookup(string key, IEnumerable<BytesRef> contexts, int num, bool allTermsRequired, bool doHighlight)
Parameters
Type Name Description
System.String key
System.Collections.Generic.IEnumerable<BytesRef> contexts
System.Int32 num
System.Boolean allTermsRequired
System.Boolean doHighlight
Returns
Type Description
System.Collections.Generic.IList<Lookup.LookupResult>
Overrides
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GetTextFieldType()

Declaration
protected override FieldType GetTextFieldType()
Returns
Type Description
FieldType
Overrides

Implements

System.IDisposable