1 files changed, 5 insertions, 1 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/ListGroupMembership.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/ListGroupMembership.java
index 346f406dc3..118940f9bf 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/ListGroupMembership.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/ListGroupMembership.java
@@ -24,7 +24,6 @@ import java.util.Set;
  * GroupMembership over an explicit list.
  */
 public class ListGroupMembership implements GroupMembership {
-
   private final Set<AccountGroup.UUID> groups;
 
   public ListGroupMembership(Iterable<AccountGroup.UUID> groupIds) {
@@ -47,6 +46,11 @@ public class ListGroupMembership implements GroupMembership {
   }
 
   @Override
+  public Set<AccountGroup.UUID> intersection(Iterable<AccountGroup.UUID> groupIds) {
+    return Sets.intersection(ImmutableSet.copyOf(groupIds), groups);
+  }
+
+  @Override
   public Set<AccountGroup.UUID> getKnownGroups() {
     return Sets.newHashSet(groups);
   }