Package org.apache.lucene.search

Class PrefixQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.MultiTermQuery

org.apache.lucene.search.PrefixQuery

All Implemented Interfaces:

Cloneable

public class PrefixQuery
extends MultiTermQuery

A Query that matches documents containing terms with a specified prefix. A PrefixQuery is built by QueryParser for input like app*.

This query uses the MultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT rewrite method.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.MultiTermQuery

MultiTermQuery.ConstantScoreAutoRewrite, MultiTermQuery.RewriteMethod, MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite, MultiTermQuery.TopTermsScoringBooleanQueryRewrite

Field Summary

Fields inherited from class org.apache.lucene.search.MultiTermQuery

CONSTANT_SCORE_AUTO_REWRITE_DEFAULT, CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE, CONSTANT_SCORE_FILTER_REWRITE, field, rewriteMethod, SCORING_BOOLEAN_QUERY_REWRITE

Constructor Summary

Constructors

Constructor	Description
PrefixQuery(Term prefix)	Constructs a query for terms starting with prefix.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
Term	getPrefix()	Returns the prefix of this query.
protected TermsEnum	getTermsEnum(Terms terms, AttributeSource atts)	Construct the enumeration to be used, expanding the pattern term.
int	hashCode()
String	toString(String field)	Prints a user-readable version of this query.

Methods inherited from class org.apache.lucene.search.MultiTermQuery

getField, getRewriteMethod, getTermsEnum, rewrite, setRewriteMethod

Methods inherited from class org.apache.lucene.search.Query

clone, createWeight, extractTerms, getBoost, setBoost, toString

Methods inherited from class java.lang.Object

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

Constructor Details

PrefixQuery

public PrefixQuery(Term prefix)

Constructs a query for terms starting with prefix.

Method Details

getPrefix

public Term getPrefix()

Returns the prefix of this query.

getTermsEnum

protected TermsEnum getTermsEnum(Terms terms,
 AttributeSource atts)
                          throws IOException

Description copied from class: MultiTermQuery

Construct the enumeration to be used, expanding the pattern term. This method should only be called if the field exists (ie, implementations can assume the field does exist). This method should not return null (should instead return TermsEnum.EMPTY if no terms match). The TermsEnum must already be positioned to the first matching term. The given AttributeSource is passed by the MultiTermQuery.RewriteMethod to provide attributes, the rewrite method uses to inform about e.g. maximum competitive boosts. This is currently only used by TopTermsRewrite

Specified by:

getTermsEnum in class MultiTermQuery

Throws:

IOException

toString

public String toString(String field)

Prints a user-readable version of this query.

Specified by:

toString in class Query

hashCode

public int hashCode()

Overrides:

hashCode in class MultiTermQuery

equals

public boolean equals(Object obj)

Overrides:

equals in class MultiTermQuery