gnodet commented on code in PR #2037:
URL: https://github.com/apache/maven/pull/2037#discussion_r1912070489
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api/maven-api-core/src/main/java/org/apache/maven/api/services/BaseRequest.java:
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@@ -52,9 +51,16 @@ public static <T> T nonNull(T obj, String message) {
return obj;
}
- protected static <T> Collection<T> unmodifiable(Collection<T> obj) {
- return obj != null && !obj.isEmpty()
- ? Collections.unmodifiableCollection(new ArrayList<>(obj))
- : Collections.emptyList();
+ /**
+ * Creates a defensive immutable copy of a collection or returns an empty
immutable list if the input is null or empty.
+ * This method is useful when creating immutable objects to ensure
collection fields cannot be modified by external code.
+ *
+ * @param source the source collection to create an immutable copy from
+ * @param <T> the type of elements in the collection
+ * @return an unmodifiable view of the collection, or an empty list if the
input is null or empty
+ * @throws NullPointerException if the collection contains null elements
Review Comment:
It's just a side effect of using `List.copyOf()`. The behavior thus
surfaces to this helper methods and the javadoc mentions it.
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