YeonCheolGit commented on code in PR #12019:
URL: https://github.com/apache/kafka/pull/12019#discussion_r862396035
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connect/runtime/src/main/java/org/apache/kafka/connect/util/ConnectUtils.java:
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@@ -160,4 +166,40 @@ public static boolean isSourceConnector(Connector
connector) {
return SourceConnector.class.isAssignableFrom(connector.getClass());
}
+ public static <K, I, O> Map<K, O> transformValues(Map<K, I> map,
Function<I, O> transformation) {
+ return map.entrySet().stream().collect(Collectors.toMap(
+ Map.Entry::getKey,
+ transformation.compose(Map.Entry::getValue)
+ ));
+ }
+
+ public static <I> List<I> combineCollections(Collection<? extends
Collection<I>> collections) {
+ return combineCollections(collections, Function.identity());
+ }
+
+ public static <I, T> List<T> combineCollections(Collection<? extends I>
collection, Function<I, Collection<T>> extractCollection) {
+ return combineCollections(collection, extractCollection,
Collectors.toList());
+ }
+
+ public static <I, T, C> C combineCollections(
Review Comment:
Could you explain why `combineCollections` return `combineCollections` then
return `combineCollections`?
For me, It looks final returning result is always `<I, T, C> C
combineCollections`. Why not using only `<I, T, C> C combineCollections`?
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