Class CollectionUtils

java.lang.Object

org.aksw.commons.collections.CollectionUtils

public class CollectionUtils
extends Object

User: raven Date: 4/17/11 Time: 12:36 AM

Constructor Summary

Constructors

Constructor	Description
CollectionUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	argmaxInt(Collection<T> xs, ToIntFunction<? super T> score)
static <T> List<List<T>>	chunk(Iterable<T> col, int batchSize)
static <T, C extends Collection<T>> C	newCollection(Supplier<C> collectionSupplier, Iterable<? extends T> items)	Create a new collection and initialize it with items from an iterable Mainly useful in cases where use of guava could cause issues (e.g.
static <T, C extends Collection<T>> C	newCollection(Supplier<C> collectionSupplier, Iterator<? extends T> itemIt)	Create a new collection and initialize it with items from an iterator Mainly useful in cases where use of guava could cause issues (e.g.
static <S, T extends Iterable<S>> Iterable<S>	safeGetFirst(Iterable<T> iterable)	Given an iterable A whose elements are iterables, this method will return the first element of A.

Methods inherited from class Object

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

Constructor Details

CollectionUtils

public CollectionUtils()

Method Details

newCollection

public static <T, C extends Collection<T>> C newCollection(Supplier<C> collectionSupplier,
 Iterator<? extends T> itemIt)

Create a new collection and initialize it with items from an iterator Mainly useful in cases where use of guava could cause issues (e.g. hadoop/spark)

newCollection

public static <T, C extends Collection<T>> C newCollection(Supplier<C> collectionSupplier,
 Iterable<? extends T> items)

Create a new collection and initialize it with items from an iterable Mainly useful in cases where use of guava could cause issues (e.g. hadoop/spark)

safeGetFirst

public static <S, T extends Iterable<S>>
Iterable<S> safeGetFirst(Iterable<T> iterable)

Given an iterable A whose elements are iterables, this method will return the first element of A. If no such element exist, an empty iterable is returned rather than null.

Type Parameters:

S -

T -

Parameters:

iterable -

Returns:

chunk

public static <T> List<List<T>> chunk(Iterable<T> col,
 int batchSize)

argmaxInt

public static <T> Optional<T> argmaxInt(Collection<T> xs,
 ToIntFunction<? super T> score)