From 59f26da5655418c644fbaa8d1bf24094d88000d7 Mon Sep 17 00:00:00 2001
From: Kezhu Wang <kezhuw@apache.org>
Date: Tue, 26 Aug 2025 23:51:09 +0800
Subject: [PATCH] ZOOKEEPER-842: [ADDENDUM] Keep `DataTree::copyStat` for
 compatibility with Apache Curator

`DataTree` is apparently internal to zookeeper. But we don't export
public alternatives to `copyStat` and `copyStatPersisted` until now.
So, let's keep them for some releases to let downstream libraries to
migrate to `Stat::copyFrom`.

Refs: ZOOKEEPER-842, #2305.
---
 .../org/apache/zookeeper/server/DataTree.java | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java b/zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java
index b682ec64fb0..a9c69b48601 100644
--- a/zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java
+++ b/zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java
@@ -342,6 +342,26 @@ boolean isSpecialPath(String path) {
                || configZookeeper.equals(path);
     }
 
+    /**
+     * Use {@link StatPersisted#copyFrom(StatPersisted)} instead.
+     *
+     * <p>Apache Curator uses it, let's keep it for now to let them and their clients to react.
+     */
+    @Deprecated
+    public static void copyStatPersisted(StatPersisted from, StatPersisted to) {
+        to.copyFrom(from);
+    }
+
+    /**
+     * Use {@link Stat#copyFrom(Stat)} instead.
+     *
+     * <p> Apache Curator uses it, let's keep it for now to let them and their clients to react.
+     */
+    @Deprecated
+    public static void copyStat(Stat from, Stat to) {
+        to.copyFrom(from);
+    }
+
     /**
      * update the count/bytes of this stat data node
      *