org.apache.lucene.search.join

Class ToChildBlockJoinQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.join.ToChildBlockJoinQuery

All Implemented Interfaces:

Cloneable

public class ToChildBlockJoinQuery
extends Query

Just like ToParentBlockJoinQuery, except this query joins in reverse: you provide a Query matching parent documents and it joins down to child documents.

Constructor Summary

Constructors

Constructor and Description
ToChildBlockJoinQuery(Query parentQuery, Filter parentsFilter, boolean doScores) Create a ToChildBlockJoinQuery.

Method Summary

Methods

Modifier and Type	Method and Description
ToChildBlockJoinQuery	clone() Returns a clone of this query.
Weight	createWeight(IndexSearcher searcher) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object _other)
void	extractTerms(Set<Term> terms) Expert: adds all terms occurring in this query to the terms set.
int	hashCode()
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.
String	toString(String field) Prints a query to a string, with field assumed to be the default field and omitted.

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

getBoost, setBoost, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ToChildBlockJoinQuery

public ToChildBlockJoinQuery(Query parentQuery,
                     Filter parentsFilter,
                     boolean doScores)

Create a ToChildBlockJoinQuery.

Parameters:

parentQuery - Query that matches parent documents

parentsFilter - Filter (must produce FixedBitSet per-segment, like FixedBitSetCachingWrapperFilter) identifying the parent documents.

doScores - true if parent scores should be calculated

Method Detail

createWeight

public Weight createWeight(IndexSearcher searcher)
                    throws IOException

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

Throws:

IOException

extractTerms

public void extractTerms(Set<Term> terms)

Description copied from class: Query

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

Overrides:

extractTerms in class Query

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

toString

public String toString(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

equals

public boolean equals(Object _other)

Overrides:

equals in class Query

hashCode

public int hashCode()

Overrides:

hashCode in class Query

clone

public ToChildBlockJoinQuery clone()

Description copied from class: Query

Returns a clone of this query.

Overrides:

clone in class Query