From a723a7cba3cd863940ffbb6c9e658aab221e76ed Mon Sep 17 00:00:00 2001
From: "its.bread" <38575088+cyljacky02@users.noreply.github.com>
Date: Fri, 5 Dec 2025 01:45:38 +0800
Subject: [PATCH] Fix MongoDB getMapBinding and clarify Javadoc (#624)

---
 .../java/net/william278/husksync/database/Database.java   | 8 ++++----
 .../net/william278/husksync/database/MongoDbDatabase.java | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/common/src/main/java/net/william278/husksync/database/Database.java b/common/src/main/java/net/william278/husksync/database/Database.java
index 38e909ca..290ad9df 100644
--- a/common/src/main/java/net/william278/husksync/database/Database.java
+++ b/common/src/main/java/net/william278/husksync/database/Database.java
@@ -280,11 +280,11 @@ public abstract class Database {
     public abstract byte @Nullable [] getMapData(@NotNull String serverName, int mapId);
 
     /**
-     * Get a map server -> ID binding in the database
+     * Reverse lookup: given a local map binding, find the origin server and map ID.
      *
-     * @param serverName Name of the server the map originates from
-     * @param mapId      Original map ID
-     * @return Map.Entry (key: server name, value: map ID)
+     * @param serverName Name of the local server (to_server_name in the binding)
+     * @param mapId      Local map ID on this server (to_id in the binding)
+     * @return Map.Entry with origin server name (key) and origin map ID (value), or null if not found
      */
     @Blocking
     public abstract @Nullable Map.Entry<String, Integer> getMapBinding(@NotNull String serverName, int mapId);
diff --git a/common/src/main/java/net/william278/husksync/database/MongoDbDatabase.java b/common/src/main/java/net/william278/husksync/database/MongoDbDatabase.java
index 32987059..a2da42ff 100644
--- a/common/src/main/java/net/william278/husksync/database/MongoDbDatabase.java
+++ b/common/src/main/java/net/william278/husksync/database/MongoDbDatabase.java
@@ -399,8 +399,8 @@ public class MongoDbDatabase extends Database {
         final Document doc = iterable.first();
         if (doc != null) {
             return new AbstractMap.SimpleImmutableEntry<>(
-                    doc.getString("server_name"),
-                    doc.getInteger("to_id")
+                    doc.getString("from_server_name"),
+                    doc.getInteger("from_id")
             );
         }
         return null;