Package ca.uhn.fhir.util

Class CollectionUtil

java.lang.Object

ca.uhn.fhir.util.CollectionUtil

public class CollectionUtil
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Set<T>	newSet(T... theValues)	This method is equivalent to Set.of(...) but is kept here and used instead of that method because Set.of is not present on Android SDKs (at least up to 29).
static <T> Collection<T>	nullSafeUnion(Collection<T> theCollection0, Collection<T> theCollection1)	Returns an immutable union of both collections.

Methods inherited from class java.lang.Object

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

Method Details

nullSafeUnion

@Nonnull
public static <T> Collection<T> nullSafeUnion(@Nullable
 Collection<T> theCollection0,
 @Nullable
 Collection<T> theCollection1)

Returns an immutable union of both collections. If either or both arguments are null they will be treated as an empty collection, meaning that even if both arguments are null, an empty immutable collection will be returned.

DO NOT use this method if the underlying collections can be changed after calling this method, as the behaviour is indeterminate.

Parameters:

theCollection0 - The first set in the union, or null.

theCollection1 - The second set in the union, or null.

Returns:

Returns a union of both collections. Will not return null ever.

Since:

7.4.0

newSet

public static <T> Set<T> newSet(T... theValues)

This method is equivalent to Set.of(...) but is kept here and used instead of that method because Set.of is not present on Android SDKs (at least up to 29).

Sets returned by this method are unmodifiable.