org.tinymediamanager.scraper.util

Class ListUtils

java.lang.Object

org.tinymediamanager.scraper.util.ListUtils

public class ListUtils
extends Object

The class ListUtils is a helper class, providing some special functions for Lists

Since:

1.0

Author:

Manuel Laggner

Constructor Summary

Constructors

Constructor and Description
ListUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> boolean	isEmpty(List<T> list) checks whether a list is null or empty
static <T> boolean	isNotEmpty(List<T> list) checks whether a list contains at least one entry
static <T> void	mergeLists(List<T> baseList, List<T> newItems) merges the entries from newItems into the baseList this implementation does adopt items from the baseList to the newItems in the same order - without creating a new list - without touching existing entries (which should not be removed) This implementation only works if .equals() of the type T is implemented in a proper way
static <T> Iterable<T>	nullSafe(Iterable<T> it) Get a nullsafe Iterable.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListUtils

public ListUtils()

Method Detail

nullSafe

public static <T> Iterable<T> nullSafe(Iterable<T> it)

Get a nullsafe Iterable. You can pass here any iterable collection and get a iterable collection back. Also works with null

Parameters:

it - the iterable collection or null

Returns:

the same iterable collection (if it was not null) or an empty iterable collection of the same type

mergeLists

public static <T> void mergeLists(List<T> baseList,
                  List<T> newItems)

merges the entries from newItems into the baseList
this implementation does adopt items from the baseList to the newItems in the same order
- without creating a new list
- without touching existing entries (which should not be removed)

This implementation only works if .equals() of the type T is implemented in a proper way

Parameters:

baseList - the base list which will be altered

newItems - the new entries which should be merged into the the existing list

isEmpty

public static <T> boolean isEmpty(List<T> list)

checks whether a list is null or empty

Parameters:

list - the list to check

Returns:

true if the list is null or empty

isNotEmpty

public static <T> boolean isNotEmpty(List<T> list)

checks whether a list contains at least one entry

Parameters:

list - the list to check

Returns:

true if the list is not null and not empty