Class SlowFuzzyQuery

Implements the classic fuzzy search query. The similarity measurement is based on the Levenshtein (edit distance) algorithm.

Note that, unlike FuzzyQuery, this query will silently allow for a (possibly huge) number of edit distances in comparisons, and may be extremely slow (comparing every term in the index).

Inheritance

System.Object

Query

MultiTermQuery

SlowFuzzyQuery

Inherited Members

MultiTermQuery.m_field

MultiTermQuery.m_rewriteMethod

MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE

MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE

MultiTermQuery.CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE

MultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT

MultiTermQuery.Field

MultiTermQuery.GetTermsEnum(Terms)

MultiTermQuery.Rewrite(IndexReader)

MultiTermQuery.MultiTermRewriteMethod

Query.Boost

Query.ToString()

Query.CreateWeight(IndexSearcher)

Lucene.Net.Search.Query.ExtractTerms(ISet<>)

Query.Clone()

Namespace: Lucene.Net.Sandbox.Queries

Assembly: Lucene.Net.Sandbox.dll

Syntax

public class SlowFuzzyQuery : MultiTermQuery

Constructors

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SlowFuzzyQuery(Term)

Calls SlowFuzzyQuery(Term, Single).

Declaration

public SlowFuzzyQuery(Term term)

Parameters

Type	Name	Description
Term	term

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SlowFuzzyQuery(Term, Single)

Calls SlowFuzzyQuery(Term, Single).

Declaration

public SlowFuzzyQuery(Term term, float minimumSimilarity)

Parameters

Type	Name	Description
Term	term
System.Single	minimumSimilarity

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SlowFuzzyQuery(Term, Single, Int32)

Calls SlowFuzzyQuery(Term, Single).

Declaration

public SlowFuzzyQuery(Term term, float minimumSimilarity, int prefixLength)

Parameters

Type	Name	Description
Term	term
System.Single	minimumSimilarity
System.Int32	prefixLength

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SlowFuzzyQuery(Term, Single, Int32, Int32)

Create a new SlowFuzzyQuery that will match terms with a similarity of at least minimumSimilarity to term. If a prefixLength > 0 is specified, a common prefix of that length is also required.

Declaration

public SlowFuzzyQuery(Term term, float minimumSimilarity, int prefixLength, int maxExpansions)

Parameters

Type	Name	Description
Term	term	the term to search for
System.Single	minimumSimilarity	a value between 0 and 1 to set the required similarity between the query term and the matching terms. For example, for a `minimumSimilarity` of `0.5` a term of the same length as the query term is considered similar to the query term if the edit distance between both terms is less than `length(term)*0.5` Alternatively, if `minimumSimilarity` is >= 1f, it is interpreted as a pure Levenshtein edit distance. For example, a value of `2f` will match all terms within an edit distance of `2` from the query term. Edit distances specified in this way may not be fractional.
System.Int32	prefixLength	length of common (non-fuzzy) prefix
System.Int32	maxExpansions	the maximum number of terms to match. If this number is greater than MaxClauseCount when the query is rewritten, then the maxClauseCount will be used instead.

Fields

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defaultMaxExpansions

Declaration

public static readonly int defaultMaxExpansions

Field Value

Type	Description
System.Int32

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defaultMinSimilarity

Declaration

public static readonly float defaultMinSimilarity

Field Value

Type	Description
System.Single

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defaultPrefixLength

Declaration

public static readonly int defaultPrefixLength

Field Value

Type	Description
System.Int32

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m_term

Declaration

protected Term m_term

Field Value

Type	Description
Term

Properties

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MinSimilarity

Gets the minimum similarity that is required for this query to match. Returns float value between 0.0 and 1.0.

Declaration

public virtual float MinSimilarity { get; }

Property Value

Type	Description
System.Single

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PrefixLength

Gets the non-fuzzy prefix length. This is the number of characters at the start of a term that must be identical (not fuzzy) to the query term if the query is to match that term.

Declaration

public virtual int PrefixLength { get; }

Property Value

Type	Description
System.Int32

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Term

Gets the pattern term.

Declaration

public virtual Term Term { get; }

Property Value

Type	Description
Term

Methods

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Equals(Object)

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
System.Object	obj

Returns

Type	Description
System.Boolean

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GetHashCode()

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32

Overrides

MultiTermQuery.GetHashCode()

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GetTermsEnum(Terms, AttributeSource)

Declaration

protected override TermsEnum GetTermsEnum(Terms terms, AttributeSource atts)

Parameters

Type	Name	Description
Terms	terms
AttributeSource	atts

Returns

Type	Description
TermsEnum

Overrides

MultiTermQuery.GetTermsEnum(Terms, AttributeSource)

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ToString(String)

Declaration

public override string ToString(string field)

Parameters

Type	Name	Description
System.String	field

Returns

Type	Description
System.String