org.apache.lucene.search.join

Class ToChildBlockJoinQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.join.ToChildBlockJoinQuery

All Implemented Interfaces:

Serializable, Cloneable

public class ToChildBlockJoinQuery
extends org.apache.lucene.search.Query

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

WARNING: to create the parents filter, always use RawTermFilter (so that the filter includes deleted docs), wrapped with CachingWrapperFilter (so that the returned bit set per reader is a FixedBitSet), specifying DeletesMode.IGNORE (so that on reopen, the filter still includes deleted docs). Failure to do this can result in completely wrong documents being returned! For example:

   Filter parents = new CachingWrapperFilter(
                          new RawTermFilter(new Term("parent", "yes")),
                          CachingWrapperFilter.DeletesMode.IGNORE);
 

See Also:

Serialized Form

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Constructor and Description
ToChildBlockJoinQuery(org.apache.lucene.search.Query parentQuery, org.apache.lucene.search.Filter parentsFilter, boolean doScores)

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone()
org.apache.lucene.search.Weight	createWeight(org.apache.lucene.search.Searcher searcher)
boolean	equals(Object _other)
void	extractTerms(Set<org.apache.lucene.index.Term> terms)
int	hashCode()
org.apache.lucene.search.Query	rewrite(org.apache.lucene.index.IndexReader reader)
String	toString(String field)

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ToChildBlockJoinQuery

public ToChildBlockJoinQuery(org.apache.lucene.search.Query parentQuery,
                     org.apache.lucene.search.Filter parentsFilter,
                     boolean doScores)

Method Detail

createWeight

public org.apache.lucene.search.Weight createWeight(org.apache.lucene.search.Searcher searcher)
                                             throws IOException

Overrides:

createWeight in class org.apache.lucene.search.Query

Throws:

IOException

extractTerms

public void extractTerms(Set<org.apache.lucene.index.Term> terms)

Overrides:

extractTerms in class org.apache.lucene.search.Query

rewrite

public org.apache.lucene.search.Query rewrite(org.apache.lucene.index.IndexReader reader)
                                       throws IOException

Overrides:

rewrite in class org.apache.lucene.search.Query

Throws:

IOException

toString

public String toString(String field)

Specified by:

toString in class org.apache.lucene.search.Query

equals

public boolean equals(Object _other)

Overrides:

equals in class org.apache.lucene.search.Query

hashCode

public int hashCode()

Overrides:

hashCode in class org.apache.lucene.search.Query

clone

public Object clone()

Overrides:

clone in class org.apache.lucene.search.Query