Package org.apache.lucene.util

Class Selector

java.lang.Object

org.apache.lucene.util.Selector

Direct Known Subclasses:

IntroSelector, RadixSelector

public abstract class Selector
extends Object

An implementation of a selection algorithm, ie. computing the k-th greatest value from a collection.

Constructor Summary

Constructors

Constructor	Description
Selector()

Method Summary

Modifier and Type	Method	Description
abstract void	select(int from, int to, int k)	Reorder elements so that the element at position k is the same as if all elements were sorted and all other elements are partitioned around it: [from, k) only contains elements that are less than or equal to k and (k, to) only contains elements that are greater than or equal to k.
protected abstract void	swap(int i, int j)	Swap values at slots i and j.

Methods inherited from class java.lang.Object

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

Constructor Details

Selector

public Selector()

Method Details

select

public abstract void select(int from,
 int to,
 int k)

Reorder elements so that the element at position k is the same as if all elements were sorted and all other elements are partitioned around it: [from, k) only contains elements that are less than or equal to k and (k, to) only contains elements that are greater than or equal to k.

swap

protected abstract void swap(int i,
 int j)

Swap values at slots i and j.