org.apache.lucene.search.join
Class ToChildBlockJoinQuery

java.lang.Object
  extended by org.apache.lucene.search.Query
      extended by 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
ToChildBlockJoinQuery(org.apache.lucene.search.Query parentQuery, org.apache.lucene.search.Filter parentsFilter, boolean doScores)
           
 
Method Summary
 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