Package org.apache.lucene.facet

Class MultiDoubleValues

java.lang.Object

org.apache.lucene.facet.MultiDoubleValues

public abstract class MultiDoubleValues
extends Object

Per-segment, per-document double values, which can be calculated at search-time. Documents may produce multiple values. See also DoubleValues for a single-valued version.

Currently meant only for use within the faceting module. Could be further generalized and made available for more use-cases outside faceting if there is a desire to do so.

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

Constructor Summary

Constructors

Constructor	Description
MultiDoubleValues()	Instantiates a new MultiDoubleValues

Method Summary

Modifier and Type	Method	Description
abstract boolean	advanceExact(int doc)	Advance to exactly doc and return whether doc has a value.
abstract long	getValueCount()	Retrieves the number of values for the current document.
abstract double	nextValue()	Iterates to the next value in the current document.

Methods inherited from class java.lang.Object

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

Constructor Details

MultiDoubleValues

public MultiDoubleValues()

Instantiates a new MultiDoubleValues

Method Details

getValueCount

public abstract long getValueCount()

Retrieves the number of values for the current document. This must always be greater than zero. It is illegal to call this method after advanceExact(int) returned false.

nextValue

public abstract double nextValue()
                          throws IOException

Iterates to the next value in the current document. Do not call this more than getValueCount() times for the document.

Throws:

IOException

advanceExact

public abstract boolean advanceExact(int doc)
                              throws IOException

Advance to exactly doc and return whether doc has a value.

Throws:

IOException