Package org.apache.lucene.search

Class DoubleValues

java.lang.Object

org.apache.lucene.search.DoubleValues

public abstract class DoubleValues
extends Object

Per-segment, per-document double values, which can be calculated at search-time

Field Summary

Fields

Modifier and Type	Field	Description
static final DoubleValues	EMPTY	An empty DoubleValues instance that always returns false from advanceExact(int)

Constructor Summary

Constructors

Constructor	Description
DoubleValues()

Method Summary

Modifier and Type	Method	Description
abstract boolean	advanceExact(int doc)	Advance this instance to the given document id
abstract double	doubleValue()	Get the double value for the current document
static DoubleValues	withDefault(DoubleValues in, double missingValue)	Wrap a DoubleValues instance, returning a default if the wrapped instance has no value

Methods inherited from class java.lang.Object

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

Field Details

EMPTY

public static final DoubleValues EMPTY

An empty DoubleValues instance that always returns false from advanceExact(int)

Constructor Details

DoubleValues

public DoubleValues()

Method Details

doubleValue

public abstract double doubleValue()
                            throws IOException

Get the double value for the current document

Throws:

IOException

advanceExact

public abstract boolean advanceExact(int doc)
                              throws IOException

Advance this instance to the given document id

Returns:

true if there is a value for this document

Throws:

IOException

withDefault

public static DoubleValues withDefault(DoubleValues in,
 double missingValue)

Wrap a DoubleValues instance, returning a default if the wrapped instance has no value