From 8c6e5b79636673435c9a8afe51dd2ffe4a2c7f4b Mon Sep 17 00:00:00 2001
From: Mark Hansen <markhansen@google.com>
Date: Fri, 10 May 2024 08:29:52 -0700
Subject: [PATCH] Avoid allocating iterator in TextFormat printing
 UnknownFieldSet

PiperOrigin-RevId: 632503842
---
 java/core/src/main/java/com/google/protobuf/TextFormat.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/java/core/src/main/java/com/google/protobuf/TextFormat.java b/java/core/src/main/java/com/google/protobuf/TextFormat.java
index eb05fb2f41f07..71b2b33f674cc 100644
--- a/java/core/src/main/java/com/google/protobuf/TextFormat.java
+++ b/java/core/src/main/java/com/google/protobuf/TextFormat.java
@@ -581,6 +581,9 @@ private void printSingleField(
 
     private static void printUnknownFields(
         final UnknownFieldSet unknownFields, final TextGenerator generator) throws IOException {
+      if (unknownFields.isEmpty()) {
+        return;
+      }
       for (Map.Entry<Integer, UnknownFieldSet.Field> entry : unknownFields.asMap().entrySet()) {
         final int number = entry.getKey();
         final UnknownFieldSet.Field field = entry.getValue();