nizhikov commented on code in PR #15873:
URL: https://github.com/apache/kafka/pull/15873#discussion_r1592249836
##########
core/src/test/java/kafka/admin/ConfigCommandUnitTest.java:
##########
@@ -418,4 +880,77 @@ public static String[] toArray(String... first) {
public static String[] toArray(List<String>... lists) {
return Stream.of(lists).flatMap(List::stream).toArray(String[]::new);
}
+
+ @SafeVarargs
+ public static List<String> concat(List<String>... lists) {
+ return
Stream.of(lists).flatMap(List::stream).collect(Collectors.toList());
+ }
+
+ @SafeVarargs
+ public static <K, V> Map<K, V> concat(Map<K, V>...maps) {
+ Map<K, V> res = new HashMap<>();
Review Comment:
Thanks.
~~Used your version of method.~~
Actually, we can't use this version (I have similar at first), because, some
values of concatenating maps is null ang `merge` function used in
`Collectors.toMap` checks `value` is not null:
```
@Override
public V merge(K key, V value,
BiFunction<? super V, ? super V, ? extends V>
remappingFunction) {
if (value == null)
throw new NullPointerException();
if (remappingFunction == null)
throw new NullPointerException();
...
```
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