Class NearestFuzzyQuery
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.lucene.classification.utils.NearestFuzzyQuery
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public class NearestFuzzyQuery extends Query
Simplification of FuzzyLikeThisQuery, to be used in the context of KNN classification.
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Nested Class Summary
Nested Classes Modifier and Type Class Description (package private) static class
NearestFuzzyQuery.FieldVals
private static class
NearestFuzzyQuery.ScoreTerm
private static class
NearestFuzzyQuery.ScoreTermQueue
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Field Summary
Fields Modifier and Type Field Description private Analyzer
analyzer
private java.util.ArrayList<NearestFuzzyQuery.FieldVals>
fieldVals
private static int
MAX_NUM_TERMS
private static int
MAX_VARIANTS_PER_TERM
private static float
MIN_SIMILARITY
private static int
PREFIX_LENGTH
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Constructor Summary
Constructors Constructor Description NearestFuzzyQuery(Analyzer analyzer)
Default constructor
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addTerms(java.lang.String queryString, java.lang.String fieldName)
Adds user input for "fuzzification"private void
addTerms(IndexReader reader, NearestFuzzyQuery.FieldVals f, NearestFuzzyQuery.ScoreTermQueue q)
boolean
equals(java.lang.Object other)
Override and implement query instance equivalence properly in a subclass.private boolean
equalsTo(NearestFuzzyQuery other)
int
hashCode()
Override and implement query hash code properly in a subclass.private float
idf(int docFreq, int docCount)
private Query
newTermQuery(IndexReader reader, Term term)
Query
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.java.lang.String
toString(java.lang.String field)
Prints a query to a string, withfield
assumed to be the default field and omitted.void
visit(QueryVisitor visitor)
Recurse through the query tree, visiting any child queries-
Methods inherited from class org.apache.lucene.search.Query
classHash, createWeight, sameClassAs, toString
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Field Detail
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fieldVals
private final java.util.ArrayList<NearestFuzzyQuery.FieldVals> fieldVals
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analyzer
private final Analyzer analyzer
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MAX_VARIANTS_PER_TERM
private static final int MAX_VARIANTS_PER_TERM
- See Also:
- Constant Field Values
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MIN_SIMILARITY
private static final float MIN_SIMILARITY
- See Also:
- Constant Field Values
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PREFIX_LENGTH
private static final int PREFIX_LENGTH
- See Also:
- Constant Field Values
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MAX_NUM_TERMS
private static final int MAX_NUM_TERMS
- See Also:
- Constant Field Values
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Constructor Detail
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NearestFuzzyQuery
public NearestFuzzyQuery(Analyzer analyzer)
Default constructor- Parameters:
analyzer
- the analyzer used to process the query text
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Method Detail
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addTerms
public void addTerms(java.lang.String queryString, java.lang.String fieldName)
Adds user input for "fuzzification"- Parameters:
queryString
- The string which will be parsed by the analyzer and for which fuzzy variants will be parsed
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addTerms
private void addTerms(IndexReader reader, NearestFuzzyQuery.FieldVals f, NearestFuzzyQuery.ScoreTermQueue q) throws java.io.IOException
- Throws:
java.io.IOException
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idf
private float idf(int docFreq, int docCount)
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newTermQuery
private Query newTermQuery(IndexReader reader, Term term) throws java.io.IOException
- Throws:
java.io.IOException
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rewrite
public Query rewrite(IndexReader reader) throws java.io.IOException
Description copied from class:Query
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.
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toString
public java.lang.String toString(java.lang.String field)
Description copied from class:Query
Prints a query to a string, withfield
assumed to be the default field and omitted.
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hashCode
public int hashCode()
Description copied from class:Query
Override and implement query hash code properly in a subclass. This is required so thatQueryCache
works properly.- Specified by:
hashCode
in classQuery
- See Also:
Query.equals(Object)
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equals
public boolean equals(java.lang.Object other)
Description copied from class:Query
Override and implement query instance equivalence properly in a subclass. This is required so thatQueryCache
works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.- Specified by:
equals
in classQuery
- See Also:
Query.sameClassAs(Object)
,Query.classHash()
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equalsTo
private boolean equalsTo(NearestFuzzyQuery other)
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visit
public void visit(QueryVisitor visitor)
Description copied from class:Query
Recurse through the query tree, visiting any child queries
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