rreddy-22 commented on code in PR #15152:
URL: https://github.com/apache/kafka/pull/15152#discussion_r1459544349


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -452,21 +453,39 @@ public Group group(String groupId, long committedOffset) 
throws GroupIdNotFoundE
     /**
      * Get the Group List.
      *
-     * @param statesFilter The states of the groups we want to list.
-     *                     If empty all groups are returned with their state.
-     * @param committedOffset A specified committed offset corresponding to 
this shard
+     * @param statesFilter      The states of the groups we want to list.
+     *                          If empty, all groups are returned with their 
state.
+     * @param typesFilter       The types of the groups we want to list.
+     *                          If empty, all groups are returned with their 
type.
+     * @param committedOffset   A specified committed offset corresponding to 
this shard.
      *
      * @return A list containing the ListGroupsResponseData.ListedGroup
      */
+    public List<ListGroupsResponseData.ListedGroup> listGroups(
+        Set<String> statesFilter,
+        Set<String> typesFilter,
+        long committedOffset
+    ) {
+        // Convert typesFilter to lowercase to make the filter 
case-insensitive.
+        Set<String> lowerCaseTypesFilter = typesFilter.stream()
+            .map(String::toLowerCase)
+            .collect(Collectors.toCollection(HashSet::new));
+
+        Predicate<Group> combinedFilter = group -> {
+            boolean stateCheck = statesFilter.isEmpty() || 
statesFilter.contains(group.stateAsString(committedOffset));
+            boolean typeCheck = lowerCaseTypesFilter.isEmpty() ||
+                
lowerCaseTypesFilter.contains(group.type().toString().toLowerCase());

Review Comment:
   I was also under the impression that as long as the word spells the correct 
type we don't care what the cases of the letters are? So currently if someone 
were to type "cLaSsic" that would still be valid. If we want to strictly allow 
only "Classic" and "classic" we would need to probably add both for each type 
to the enum itself. Lmk what you think?



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