com.comphenix.xp.rewards.items

Class RandomSampling

java.lang.Object

com.comphenix.xp.rewards.items.RandomSampling

public class RandomSampling
extends java.lang.Object

Utility methods for randomly sampling elements from a list.

Author:

Kristian

Constructor Summary

Constructors

Constructor and Description
RandomSampling()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	getRandomElement(java.util.List<T> list) Samples a random element from the given list with a uniform distribution of probabilities.
static <T> T	getRandomElement(java.util.List<T> list, T defaultValue) Samples a random element from the given list with a uniform distribution of probabilities.
static java.util.Random	getThreadRandom() Retrieves a thread-local random number generator.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomSampling

public RandomSampling()

Method Detail

getThreadRandom

public static java.util.Random getThreadRandom()

Retrieves a thread-local random number generator.

Returns:

Thread-local random number generator.

getRandomElement

public static <T> T getRandomElement(java.util.List<T> list)

Samples a random element from the given list with a uniform distribution of probabilities.

This method is thread safe.

Parameters:

list - - list to sample from.

Returns:

The random element.

Throws:

org.apache.commons.lang.NullArgumentException - - if the list is null.

java.lang.IndexOutOfBoundsException - - if the list is empty.

getRandomElement

public static <T> T getRandomElement(java.util.List<T> list,
                     T defaultValue)

Samples a random element from the given list with a uniform distribution of probabilities.

This method is thread safe.

Parameters:

list - - list to sample from.

defaultValue - - value to return if the list is empty or null.

Returns:

The random element.