org.lenskit.util.collections

Class CollectionUtils

java.lang.Object

org.lenskit.util.collections.CollectionUtils

public final class CollectionUtils
extends java.lang.Object

Various helper methods for working with collections (particularly Fastutil collections).

Compatibility

Public

Method Summary

Modifier and Type	Method and Description
static IntList	interval(int from, int to) Create an IntList that contains all numbers in a specified interval.
static <E> ObjectCollection<E>	objectCollection(java.util.Collection<E> objects) Wrap a Collection in an ObjectCollection.
static <T> java.util.List<T>	repeat(T obj, int n) Return a list that repeats a single object multiple times.

Methods inherited from class java.lang.Object

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

Method Detail

objectCollection

public static <E> ObjectCollection<E> objectCollection(java.util.Collection<E> objects)

Wrap a Collection in an ObjectCollection.

Parameters:

objects - The collection of objects.

E - The type of objects.

Returns:

The collection as an ObjectCollection.

repeat

public static <T> java.util.List<T> repeat(T obj,
                                           int n)

Return a list that repeats a single object multiple times.

Parameters:

obj - The object.

n - The size of the list.

T - The type of list elements.

Returns:

A list containing obj n times.

interval

public static IntList interval(int from,
                               int to)

Create an IntList that contains all numbers in a specified interval.

Parameters:

from - The first number (inclusive)

to - the last number (exclusive).

Returns:

A list containing the integers in the interval [from,to).