org.apache.lucene.search

Class FilteredQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.FilteredQuery

All Implemented Interfaces:

Serializable, Cloneable

public class FilteredQuery
extends Query

A query that applies a filter to the results of another query.

Note: the bits are retrieved from the filter each time this query is used in a search - use a CachingWrapperFilter to avoid regenerating the bits every time.

Created: Apr 20, 2004 8:58:29 AM

Since:

1.4

Version:

$Id: FilteredQuery.java 695514 2008-09-15 15:42:11Z otis $

See Also:

CachingWrapperFilter, Serialized Form

Constructor Summary

Constructors

Constructor and Description
FilteredQuery(Query query, Filter filter) Constructs a new query which applies a filter to the results of the original query.

Method Summary

Methods

Modifier and Type	Method and Description
protected Weight	createWeight(Searcher searcher) Returns a Weight that applies the filter to the enclosed query's Weight.
boolean	equals(Object o) Returns true iff o is equal to this.
void	extractTerms(Set terms) Expert: adds all terms occuring in this query to the terms set.
Filter	getFilter()
Query	getQuery()
int	hashCode() Returns a hash code value for this object.
Query	rewrite(IndexReader reader) Rewrites the wrapped query.
String	toString(String s) 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

Constructor Detail

FilteredQuery

public FilteredQuery(Query query,
             Filter filter)

Constructs a new query which applies a filter to the results of the original query. Filter.getDocIdSet() will be called every time this query is used in a search.

Parameters:

query - Query to be filtered, cannot be null.

filter - Filter to apply to query results, cannot be null.

Method Detail

createWeight

protected Weight createWeight(Searcher searcher)
                       throws IOException

Returns a Weight that applies the filter to the enclosed query's Weight. This is accomplished by overriding the Scorer returned by the Weight.

Overrides:

createWeight in class Query

Throws:

IOException

rewrite

public Query rewrite(IndexReader reader)
              throws IOException

Rewrites the wrapped query.

Overrides:

rewrite in class Query

Throws:

IOException

getQuery

public Query getQuery()

getFilter

public Filter getFilter()

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

toString

public String toString(String s)

Prints a user-readable version of this query.

Specified by:

toString in class Query

equals

public boolean equals(Object o)

Returns true iff 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