org.apache.lucene.search.comparators

Class DocComparator

java.lang.Object

org.apache.lucene.search.FieldComparator<Integer>

org.apache.lucene.search.comparators.DocComparator

public class DocComparator
extends FieldComparator<Integer>

Comparator that sorts by asc _doc

Nested Class Summary

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

FieldComparator.RelevanceComparator, FieldComparator.TermOrdValComparator, FieldComparator.TermValComparator

Constructor Summary

Constructors

Constructor and Description
DocComparator(int numHits, boolean reverse, int sortPost) Creates a new comparator based on document ids for numHits

Method Summary

Modifier and Type	Method and Description
int	compare(int slot1, int slot2) Compare hit at slot1 with hit at slot2.
LeafFieldComparator	getLeafComparator(LeafReaderContext context) Get a per-segment LeafFieldComparator to collect the given LeafReaderContext.
void	setTopValue(Integer value) Record the top value, for future calls to LeafFieldComparator.compareTop(int).
Integer	value(int slot) Return the actual value in the slot.

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

compareValues, disableSkipping, setSingleSort

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DocComparator

public DocComparator(int numHits,
                     boolean reverse,
                     int sortPost)

Creates a new comparator based on document ids for numHits

Method Detail

compare

public int compare(int slot1,
                   int slot2)

Description copied from class: FieldComparator

Compare hit at slot1 with hit at slot2.

Specified by:

compare in class FieldComparator<Integer>

Parameters:

slot1 - first slot to compare

slot2 - second slot to compare

Returns:

any N < 0 if slot2's value is sorted after slot1, any N > 0 if the slot2's value is sorted before slot1 and 0 if they are equal

getLeafComparator

public LeafFieldComparator getLeafComparator(LeafReaderContext context)

Description copied from class: FieldComparator

Get a per-segment LeafFieldComparator to collect the given LeafReaderContext. All docIDs supplied to this LeafFieldComparator are relative to the current reader (you must add docBase if you need to map it to a top-level docID).

Specified by:

getLeafComparator in class FieldComparator<Integer>

Parameters:

context - current reader context

Returns:

the comparator to use for this segment

setTopValue

public void setTopValue(Integer value)

Description copied from class: FieldComparator

Record the top value, for future calls to LeafFieldComparator.compareTop(int). This is only called for searches that use searchAfter (deep paging), and is called before any calls to FieldComparator.getLeafComparator(LeafReaderContext).

Specified by:

setTopValue in class FieldComparator<Integer>

value

public Integer value(int slot)

Description copied from class: FieldComparator

Return the actual value in the slot.

Specified by:

value in class FieldComparator<Integer>

Parameters:

slot - the value

Returns:

value in this slot