Package nl.vpro.domain.media

Class CollectionUtils

java.lang.Object

nl.vpro.domain.media.CollectionUtils

public class CollectionUtils
extends Object

Some static methods used in this package that are related to dealing with collections

Since:

5.12

Author:

Michiel Meeuwissen

Method Summary

Modifier and Type	Method	Description
static <P extends Comparable<P>> SortedSet<P>	createIfNull(SortedSet<P> set)
static <P extends Comparable<P>> @Nullable SortedSet<P>	createIfNullUnlessNull(@Nullable SortedSet<P> set, @Nullable Object check)
protected static <E> @Nullable E	getFromList(@Nullable List<@NonNull E> list)
static <P> boolean	inCollection(Collection<P> col, P element)	null-safe Collection.contains(Object).
static <E> int	indexOf(List<E> list, E o, int offset)

Methods inherited from class java.lang.Object

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

Method Details

getFromList

protected static <E> @Nullable E getFromList(@Nullable List<@NonNull E> list)

indexOf

public static <E> int indexOf(List<E> list,
 E o,
 int offset)

createIfNull

public static <P extends Comparable<P>>
SortedSet<P> createIfNull(SortedSet<P> set)

createIfNullUnlessNull

public static <P extends Comparable<P>>
@Nullable SortedSet<P> createIfNullUnlessNull(@Nullable SortedSet<P> set,
 @Nullable Object check)

inCollection

public static <P> boolean inCollection(Collection<P> col,
 P element)

null-safe Collection.contains(Object). null is never in the list.

Mainly because link java 9's Immutable lists resulting from things as List.of() throw exception if called with null (Things like Collections.unmodifiableList(List) didn't behave like that).

Since:

7.2