org.apache.lucene.search

Class WildcardQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.MultiTermQuery

org.apache.lucene.search.WildcardQuery

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class WildcardQuery
extends MultiTermQuery

Implements the wildcard search query. Supported wildcards are *, which matches any character sequence (including the empty one), and ?, which matches any single character. Note this query can be slow, as it needs to iterate over many terms. In order to prevent extremely slow WildcardQueries, a Wildcard term should not start with one of the wildcards * or ?.

See Also:

WildcardTermEnum, Serialized Form

Constructor Summary

Constructors

Constructor and Description
WildcardQuery(Term term)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
protected FilteredTermEnum	getEnum(IndexReader reader) Construct the enumeration to be used, expanding the pattern term.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.

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

getTerm, hashCode, toString

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

clone, combine, createWeight, extractTerms, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight

Methods inherited from class java.lang.Object

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

Constructor Detail

WildcardQuery

public WildcardQuery(Term term)

Method Detail

getEnum

protected FilteredTermEnum getEnum(IndexReader reader)
                            throws java.io.IOException

Description copied from class: MultiTermQuery

Construct the enumeration to be used, expanding the pattern term.

Specified by:

getEnum in class MultiTermQuery

Throws:

java.io.IOException

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class MultiTermQuery

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 MultiTermQuery

Throws:

java.io.IOException