Class ListUtils

java.lang.Object

org.aksw.commons.util.list.ListUtils

public class ListUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
ListUtils()

Method Summary

Modifier and Type	Method	Description
static <T> T	getOrDefault(List<T> list, int i, T dflt)
static <T> T	getOrNull(List<T> list, int i)	Return the item at index or null if it does not exist.
static <T> T	lastOrDefault(List<T> list, T defaultValue)
static <T> T	lastOrNull(List<T> list)	Returns the last item of the list or null if it does not exist
static <I,O> List<O>	map(List<I> inList, Function<I,O> mapper)

Methods inherited from class Object

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

Constructor Details

ListUtils

public ListUtils()

Method Details

getOrNull

public static <T> T getOrNull(List<T> list,
 int i)

Return the item at index or null if it does not exist. Checks the size of the list before accessing the item (hence, the complexity of size() is ideally O(1)) Argument must not be negative

Parameters:

list -

i -

Returns:

getOrDefault

public static <T> T getOrDefault(List<T> list,
 int i,
 T dflt)

lastOrNull

public static <T> T lastOrNull(List<T> list)

Returns the last item of the list or null if it does not exist

lastOrDefault

public static <T> T lastOrDefault(List<T> list,
 T defaultValue)

map

public static <I,O> List<O> map(List<I> inList,
 Function<I,O> mapper)