org.apache.lucene.search.join

Class ToParentBlockJoinSortField

java.lang.Object

org.apache.lucene.search.SortField

org.apache.lucene.search.join.ToParentBlockJoinSortField

public class ToParentBlockJoinSortField
extends SortField

A special sort field that allows sorting parent docs based on nested / child level fields. Based on the sort order it either takes the document with the lowest or highest field value into account.

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.SortField

SortField.Type

Field Summary

Fields inherited from class org.apache.lucene.search.SortField

FIELD_DOC, FIELD_SCORE, missingValue, STRING_FIRST, STRING_LAST

Constructor Summary

Constructors

Constructor and Description
ToParentBlockJoinSortField(String field, SortField.Type type, boolean reverse, boolean order, Filter parentFilter, Filter childFilter) Create ToParentBlockJoinSortField.
ToParentBlockJoinSortField(String field, SortField.Type type, boolean reverse, Filter parentFilter, Filter childFilter) Create ToParentBlockJoinSortField.

Method Summary

Methods

Modifier and Type	Method and Description
FieldComparator<?>	getComparator(int numHits, int sortPos)

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

equals, getBytesComparator, getComparatorSource, getField, getParser, getReverse, getType, hashCode, needsScores, rewrite, setBytesComparator, setMissingValue, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ToParentBlockJoinSortField

public ToParentBlockJoinSortField(String field,
                          SortField.Type type,
                          boolean reverse,
                          Filter parentFilter,
                          Filter childFilter)

Create ToParentBlockJoinSortField. The parent document ordering is based on child document ordering (reverse).

Parameters:

field - The sort field on the nested / child level.

type - The sort type on the nested / child level.

reverse - Whether natural order should be reversed on the nested / child level.

parentFilter - Filter that identifies the parent documents.

childFilter - Filter that defines which child documents participates in sorting.

ToParentBlockJoinSortField

public ToParentBlockJoinSortField(String field,
                          SortField.Type type,
                          boolean reverse,
                          boolean order,
                          Filter parentFilter,
                          Filter childFilter)

Create ToParentBlockJoinSortField.

Parameters:

field - The sort field on the nested / child level.

type - The sort type on the nested / child level.

reverse - Whether natural order should be reversed on the nested / child document level.

order - Whether natural order should be reversed on the parent level.

parentFilter - Filter that identifies the parent documents.

childFilter - Filter that defines which child documents participates in sorting.

Method Detail

getComparator

public FieldComparator<?> getComparator(int numHits,
                               int sortPos)
                                 throws IOException

Overrides:

getComparator in class SortField

Throws:

IOException