Package org.apache.lucene.search.comparators

Class DoubleComparator

java.lang.Object

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

org.apache.lucene.search.comparators.NumericComparator<Double>

org.apache.lucene.search.comparators.DoubleComparator

public class DoubleComparator
extends NumericComparator<Double>

Comparator based on Double.compare(double, double) for numHits. This comparator provides a skipping functionality - an iterator that can skip over non-competitive documents.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	DoubleComparator.DoubleLeafComparator	Leaf comparator for DoubleComparator that provides skipping functionality

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

NumericComparator.NumericLeafComparator

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

FieldComparator.RelevanceComparator, FieldComparator.TermOrdValComparator, FieldComparator.TermValComparator

Field Summary

Fields

Modifier and Type	Field	Description
protected double	bottom
protected double	topValue

Fields inherited from class org.apache.lucene.search.comparators.NumericComparator

field, hitsThresholdReached, missingValue, queueFull, reverse, singleSort, topValueSet

Constructor Summary

Constructors

Constructor	Description
DoubleComparator(int numHits, String field, Double missingValue, boolean reverse, boolean enableSkipping)

Method Summary

Modifier and Type	Method	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(Double value)	Record the top value, for future calls to LeafFieldComparator.compareTop(int).
Double	value(int slot)	Return the actual value in the slot.

Methods inherited from class org.apache.lucene.search.comparators.NumericComparator

disableSkipping, setSingleSort

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

compareValues

Methods inherited from class java.lang.Object

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

Field Details

topValue

protected double topValue

bottom

protected double bottom

Constructor Details

DoubleComparator

public DoubleComparator(int numHits,
 String field,
 Double missingValue,
 boolean reverse,
 boolean enableSkipping)

Method Details

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<Double>

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

setTopValue

public void setTopValue(Double 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).

Overrides:

setTopValue in class NumericComparator<Double>

value

public Double value(int slot)

Description copied from class: FieldComparator

Return the actual value in the slot.

Specified by:

value in class FieldComparator<Double>

Parameters:

slot - the value

Returns:

value in this slot

getLeafComparator

public LeafFieldComparator getLeafComparator(LeafReaderContext context)
                                      throws IOException

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<Double>

Parameters:

context - current reader context

Returns:

the comparator to use for this segment

Throws:

IOException - if there is a low-level IO error