de.alpharogroup.collections.list

Class OptionalListExtensions

java.lang.Object

de.alpharogroup.collections.list.OptionalListExtensions

public final class OptionalListExtensions
extends java.lang.Object

Extensions class for use with List objects

Method Summary

Modifier and Type	Method and Description
static <T> java.util.Optional<T>	getFirst(java.util.List<T> list) Returns an Optional with the first object from the given List
static <T> java.util.Optional<T>	getLast(java.util.List<T> list) Returns an Optional with the last object from the given List
static <T> java.util.Optional<T>	getNext(java.util.List<T> list, T element) Gets the next element from the given List.
static <T> java.util.Optional<T>	getPrevious(java.util.List<T> list, T element) Gets the previous element from the given List.
static <T> java.util.Optional<T>	removeFirst(java.util.List<T> list) Returns an Optional with the first object if it was removed from the given List
static <T> java.util.Optional<T>	removeLast(java.util.List<T> list) Returns an Optional with the last object if it was removed from the given List

Methods inherited from class java.lang.Object

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

Method Detail

getFirst

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

Returns an Optional with the first object from the given List

Type Parameters:

T - the generic type of the elements

Parameters:

list - the List object

Returns:

an Optional with the first object from the given List or an empty Optional if the List is empty

getLast

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

Returns an Optional with the last object from the given List

Type Parameters:

T - the generic type of the elements

Parameters:

list - the List object

Returns:

an Optional with the last object from the given List or an empty Optional if the List is empty

getNext

public static <T> java.util.Optional<T> getNext(java.util.List<T> list,
                                                T element)

Gets the next element from the given List. As start point is the given element

Type Parameters:

T - the generic type of elements

Parameters:

list - the list

element - the element

Returns:

an Optional with the next element from the given List or an empty Optional if the List has no next element

getPrevious

public static <T> java.util.Optional<T> getPrevious(java.util.List<T> list,
                                                    T element)

Gets the previous element from the given List. As start point is the given element

Type Parameters:

T - the generic type of elements

Parameters:

list - the list

element - the element

Returns:

an Optional with the previous element from the given List or an empty Optional if the List has no previous element

removeFirst

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

Returns an Optional with the first object if it was removed from the given List

Type Parameters:

T - the generic type of the elements

Parameters:

list - the List object

Returns:

returns an Optional with the first object if it was removed from the given List or an empty Optional if the List is empty

removeLast

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

Returns an Optional with the last object if it was removed from the given List

Type Parameters:

T - the generic type of the elements

Parameters:

list - the List object

Returns:

returns an Optional with the last object if it was removed from the given List or an empty Optional if the List is empty