Lucene.Net
3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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Fuzzifies ALL terms provided as strings and then picks the best n differentiating terms. In effect this mixes the behaviour of FuzzyQuery and MoreLikeThis but with special consideration of fuzzy scoring factors. This generally produces good results for queries where users may provide details in a number of fields and have no knowledge of boolean query syntax and also want a degree of fuzzy matching and a fast query. More...
Inherits Lucene.Net.Search.Query.
Public Member Functions | |
override int | GetHashCode () |
override bool | Equals (Object obj) |
FuzzyLikeThisQuery (int maxNumTerms, Analyzer analyzer) | |
void | AddTerms (String queryString, String fieldName, float minSimilarity, int prefixLength) |
override Query | Rewrite (IndexReader reader) |
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys. | |
override String | ToString (String field) |
bool | IsIgnoreTF () |
void | SetIgnoreTF (bool ignoreTF) |
Public Member Functions inherited from Lucene.Net.Search.Query | |
abstract System.String | ToString (System.String field) |
Prints a query to a string, with field assumed to be the default field and omitted. The representation used is one that is supposed to be readable by QueryParser. However, there are the following limitations:
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override System.String | ToString () |
Prints a query to a string. | |
virtual Weight | CreateWeight (Searcher searcher) |
Expert: Constructs an appropriate Weight implementation for this query. | |
virtual Weight | Weight (Searcher searcher) |
Expert: Constructs and initializes a Weight for a top-level query. | |
virtual Query | Combine (Query[] queries) |
Expert: called when re-writing queries under MultiSearcher. | |
virtual void | ExtractTerms (System.Collections.Generic.ISet< Term > terms) |
Expert: adds all terms occuring in this query to the terms set. Only works if this query is in its rewritten form. | |
virtual Similarity | GetSimilarity (Searcher searcher) |
Expert: Returns the Similarity implementation to be used for this query. Subclasses may override this method to specify their own Similarity implementation, perhaps one that delegates through that of the Searcher. By default the Searcher's Similarity implementation is returned. | |
virtual System.Object | Clone () |
Returns a clone of this query. | |
override int | GetHashCode () |
override bool | Equals (System.Object obj) |
Additional Inherited Members | |
Static Public Member Functions inherited from Lucene.Net.Search.Query | |
static Query | MergeBooleanQueries (params BooleanQuery[] queries) |
Expert: merges the clauses of a set of BooleanQuery's into a single BooleanQuery. | |
Properties inherited from Lucene.Net.Search.Query | |
virtual float | Boost [get, set] |
Gets or sets the boost for this query clause to b . Documents matching this clause will (in addition to the normal weightings) have their score multiplied by b . The boost is 1.0 by default. | |
Fuzzifies ALL terms provided as strings and then picks the best n differentiating terms. In effect this mixes the behaviour of FuzzyQuery and MoreLikeThis but with special consideration of fuzzy scoring factors. This generally produces good results for queries where users may provide details in a number of fields and have no knowledge of boolean query syntax and also want a degree of fuzzy matching and a fast query.
For each source term the fuzzy variants are held in a BooleanQuery with no coord factor (because we are not looking for matches on multiple variants in any one doc). Additionally, a specialized TermQuery is used for variants and does not use that variant term's IDF because this would favour rarer terms eg misspellings. Instead, all variants use the same IDF ranking (the one for the source query term) and this is factored into the variant's boost. If the source query term does not exist in the index the average IDF of the variants is used.
Definition at line 48 of file FuzzyLikeThisQuery.cs.
Lucene.Net.Search.FuzzyLikeThisQuery.FuzzyLikeThisQuery | ( | int | maxNumTerms, |
Analyzer | analyzer | ||
) |
Definition at line 108 of file FuzzyLikeThisQuery.cs.
void Lucene.Net.Search.FuzzyLikeThisQuery.AddTerms | ( | String | queryString, |
String | fieldName, | ||
float | minSimilarity, | ||
int | prefixLength | ||
) |
Definition at line 184 of file FuzzyLikeThisQuery.cs.
override bool Lucene.Net.Search.FuzzyLikeThisQuery.Equals | ( | Object | obj | ) |
Definition at line 72 of file FuzzyLikeThisQuery.cs.
override int Lucene.Net.Search.FuzzyLikeThisQuery.GetHashCode | ( | ) |
Definition at line 60 of file FuzzyLikeThisQuery.cs.
bool Lucene.Net.Search.FuzzyLikeThisQuery.IsIgnoreTF | ( | ) |
Definition at line 410 of file FuzzyLikeThisQuery.cs.
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virtual |
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.
Reimplemented from Lucene.Net.Search.Query.
Definition at line 257 of file FuzzyLikeThisQuery.cs.
void Lucene.Net.Search.FuzzyLikeThisQuery.SetIgnoreTF | ( | bool | ignoreTF | ) |
Definition at line 416 of file FuzzyLikeThisQuery.cs.
override String Lucene.Net.Search.FuzzyLikeThisQuery.ToString | ( | String | field | ) |
Definition at line 404 of file FuzzyLikeThisQuery.cs.