org.apache.lucene.search
Class ConstantScoreQuery

java.lang.Object
  org.apache.lucene.search.Query
      org.apache.lucene.search.ConstantScoreQuery

All Implemented Interfaces:

Serializable, Cloneable

public class ConstantScoreQuery
extends Query

A query that wraps a filter and simply returns a constant score equal to the query boost for every document in the filter.

Version:

$Id: ConstantScoreQuery.java 697119 2008-09-19 14:52:37Z mikemccand $

See Also:

Serialized Form

Nested Class Summary

protected class	ConstantScoreQuery.ConstantScorer
protected class	ConstantScoreQuery.ConstantWeight

Field Summary

protected Filter

filter

Constructor Summary

ConstantScoreQuery(Filter filter)

Method Summary

protected Weight	createWeight(Searcher searcher) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object o) Returns true if o is equal to this.
void	extractTerms(Set terms) Expert: adds all terms occuring in this query to the terms set.
Filter	getFilter() Returns the encapsulated filter
int	hashCode() Returns a hash code value for this object.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.
String	toString(String field) Prints a user-readable version of this query.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

filter

protected final Filter filter

Constructor Detail

ConstantScoreQuery

public ConstantScoreQuery(Filter filter)

Method Detail

getFilter

public Filter getFilter()

Returns the encapsulated filter

rewrite

public Query rewrite(IndexReader reader)
              throws 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:

IOException

extractTerms

public void extractTerms(Set terms)

Description copied from class: Query

Expert: adds all terms occuring in this query to the terms set. Only works if this query is in its rewritten form.

Overrides:

extractTerms in class Query

createWeight

protected Weight createWeight(Searcher searcher)

Description copied from class: Query

Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.

Overrides:

createWeight in class Query

toString

public String toString(String field)

Prints a user-readable version of this query.

Specified by:

toString in class Query

equals

public boolean equals(Object o)

Returns true if o is equal to this.

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns a hash code value for this object.

Overrides:

hashCode in class Object