Package io.github.amanzat.util

Class CollectionUtils

java.lang.Object

io.github.amanzat.util.CollectionUtils

public final class CollectionUtils
extends Object

Miscellaneous collections related utilities.

Constructor Summary

Constructors

Constructor	Description
CollectionUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Stream<List<T>>	chunkify(Iterator<T> iterator, int size)	Transforms an iterator into a stream of lists with a maximum size.
static <E> Optional<E>	getFirst(List<E> list)	Returns an optional containing the first element of the list if any.
static boolean	isEmpty(Collection<?> collection)	Returns true if the specified collection is empty, false otherwise.

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionUtils

public CollectionUtils()

Method Details

getFirst

public static <E> Optional<E> getFirst(List<E> list)

Returns an optional containing the first element of the list if any.

Type Parameters:

E - The list elements type.

Parameters:

list - The list

Returns:

An optional containing the first element of the list if any

Implementation Note:

The optional will be empty if the list is empty or if the fist element is null.

isEmpty

public static boolean isEmpty(Collection<?> collection)

Returns true if the specified collection is empty, false otherwise.

Parameters:

collection - The collection to check

Returns:

true if the specified collection is empty, false otherwise.

Implementation Note:

A null collection is considered empty.

chunkify

public static <T> Stream<List<T>> chunkify(Iterator<T> iterator,
 int size)

Transforms an iterator into a stream of lists with a maximum size.

Type Parameters:

T - The element type.

Parameters:

iterator - The iterator

size - The list (chunk) max size

Returns:

A stream of lists with the specified maximum size.

See Also:

• url