Package org.apache.lucene.queries.mlt

Class MoreLikeThisQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.queries.mlt.MoreLikeThisQuery

public class MoreLikeThisQuery
extends Query

A simple wrapper for MoreLikeThis for use in scenarios where a Query object is required eg in custom QueryParser extensions. At query.rewrite() time the reader is used to construct the actual MoreLikeThis object and obtain the real Query object.

Field Summary

Fields

Modifier and Type	Field	Description
private Analyzer	analyzer
private java.lang.String	fieldName
private java.lang.String	likeText
private int	maxQueryTerms
private int	minDocFreq
private int	minTermFrequency
private java.lang.String[]	moreLikeFields
private float	percentTermsToMatch
private java.util.Set<?>	stopWords

Constructor Summary

Constructors

Constructor	Description
MoreLikeThisQuery(java.lang.String likeText, java.lang.String[] moreLikeFields, Analyzer analyzer, java.lang.String fieldName)

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object other)	Override and implement query instance equivalence properly in a subclass.
private boolean	equalsTo(MoreLikeThisQuery other)
Analyzer	getAnalyzer()
java.lang.String	getLikeText()
int	getMaxQueryTerms()
int	getMinDocFreq()
int	getMinTermFrequency()
java.lang.String[]	getMoreLikeFields()
float	getPercentTermsToMatch()
java.util.Set<?>	getStopWords()
int	hashCode()	Override and implement query hash code properly in a subclass.
Query	rewrite(IndexReader reader)	Expert: called to re-write queries into primitive queries.
void	setAnalyzer(Analyzer analyzer)
void	setLikeText(java.lang.String likeText)
void	setMaxQueryTerms(int maxQueryTerms)
void	setMinDocFreq(int minDocFreq)
void	setMinTermFrequency(int minTermFrequency)
void	setMoreLikeFields(java.lang.String[] moreLikeFields)
void	setPercentTermsToMatch(float percentTermsToMatch)
void	setStopWords(java.util.Set<?> stopWords)
java.lang.String	toString(java.lang.String field)	Prints a query to a string, with field 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

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

likeText

private java.lang.String likeText

moreLikeFields

private java.lang.String[] moreLikeFields

analyzer

private Analyzer analyzer

fieldName

private final java.lang.String fieldName

percentTermsToMatch

private float percentTermsToMatch

minTermFrequency

private int minTermFrequency

maxQueryTerms

private int maxQueryTerms

stopWords

private java.util.Set<?> stopWords

minDocFreq

private int minDocFreq

Constructor Detail

MoreLikeThisQuery

public MoreLikeThisQuery(java.lang.String likeText,
                         java.lang.String[] moreLikeFields,
                         Analyzer analyzer,
                         java.lang.String fieldName)

Parameters:

moreLikeFields - fields used for similarity measure

Method Detail

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.

Overrides:

rewrite in class Query

Throws:

java.io.IOException

toString

public java.lang.String toString(java.lang.String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

Specified by:

toString in class Query

getPercentTermsToMatch

public float getPercentTermsToMatch()

setPercentTermsToMatch

public void setPercentTermsToMatch(float percentTermsToMatch)

getAnalyzer

public Analyzer getAnalyzer()

setAnalyzer

public void setAnalyzer(Analyzer analyzer)

getLikeText

public java.lang.String getLikeText()

setLikeText

public void setLikeText(java.lang.String likeText)

getMaxQueryTerms

public int getMaxQueryTerms()

setMaxQueryTerms

public void setMaxQueryTerms(int maxQueryTerms)

getMinTermFrequency

public int getMinTermFrequency()

setMinTermFrequency

public void setMinTermFrequency(int minTermFrequency)

getMoreLikeFields

public java.lang.String[] getMoreLikeFields()

setMoreLikeFields

public void setMoreLikeFields(java.lang.String[] moreLikeFields)

getStopWords

public java.util.Set<?> getStopWords()

setStopWords

public void setStopWords(java.util.Set<?> stopWords)

getMinDocFreq

public int getMinDocFreq()

setMinDocFreq

public void setMinDocFreq(int minDocFreq)

hashCode

public int hashCode()

Description copied from class: Query

Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)

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 that QueryCache 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 class Query

See Also:

Query.sameClassAs(Object), Query.classHash()

equalsTo

private boolean equalsTo(MoreLikeThisQuery other)

visit

public void visit(QueryVisitor visitor)

Description copied from class: Query

Recurse through the query tree, visiting any child queries

Overrides:

visit in class Query

Parameters:

visitor - a QueryVisitor to be called by each query in the tree