1 files changed, 30 insertions, 0 deletions
diff --git a/java/com/google/gerrit/reviewdb/client/RefNames.java b/java/com/google/gerrit/reviewdb/client/RefNames.java
index fd2fb56b0e..994a299ef1 100644
--- a/java/com/google/gerrit/reviewdb/client/RefNames.java
+++ b/java/com/google/gerrit/reviewdb/client/RefNames.java
@@ -118,6 +118,11 @@ public class RefNames {
     return shard(id.get(), r).append(META_SUFFIX).toString();
   }
 
+  public static String patchSetRef(PatchSet.Id id) {
+    StringBuilder r = newStringBuilder().append(REFS_CHANGES);
+    return shard(id.changeId.get(), r).append('/').append(id.get()).toString();
+  }
+
   public static String robotCommentsRef(Change.Id id) {
     StringBuilder r = newStringBuilder().append(REFS_CHANGES);
     return shard(id.get(), r).append(ROBOT_COMMENTS_SUFFIX).toString();
@@ -263,6 +268,31 @@ public class RefNames {
     return REFS_CONFIG.equals(ref);
   }
 
+  /**
+   * Whether the ref is managed by Gerrit. Covers all Gerrit-internal refs like refs/cache-automerge
+   * and refs/meta as well as refs/changes. Does not cover user-created refs like branches or custom
+   * ref namespaces like refs/my-company.
+   *
+   * <p>Any ref for which this method evaluates to true will be served to users who have the {@code
+   * ACCESS_DATABASE} capability.
+   *
+   * <p><b>Caution</b>Any ref not in this list will be served if the user was granted a READ
+   * permission on it using Gerrit's permission model.
+   */
+  public static boolean isGerritRef(String ref) {
+    return ref.startsWith(REFS_CHANGES)
+        || ref.startsWith(REFS_EXTERNAL_IDS)
+        || ref.startsWith(REFS_CACHE_AUTOMERGE)
+        || ref.startsWith(REFS_DRAFT_COMMENTS)
+        || ref.startsWith(REFS_DELETED_GROUPS)
+        || ref.startsWith(REFS_SEQUENCES)
+        || ref.startsWith(REFS_GROUPS)
+        || ref.startsWith(REFS_GROUPNAMES)
+        || ref.startsWith(REFS_USERS)
+        || ref.startsWith(REFS_STARRED_CHANGES)
+        || ref.startsWith(REFS_REJECT_COMMITS);
+  }
+
   static Integer parseShardedRefPart(String name) {
     if (name == null) {
       return null;