From 28fc1e4823e55fd331ae09e5c0196052c0ec4343 Mon Sep 17 00:00:00 2001
From: Mark Paluch <mpaluch@vmware.com>
Date: Tue, 13 Apr 2021 09:09:23 +0200
Subject: [PATCH] Polishing.

Use ObjectUtils for empty check.

See #3623
Original pull request: #3625.
---
 .../data/mongodb/repository/query/AggregationUtils.java        | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AggregationUtils.java b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AggregationUtils.java
index c06a7a691..1ca713a6d 100644
--- a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AggregationUtils.java
+++ b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AggregationUtils.java
@@ -39,6 +39,7 @@ import org.springframework.data.repository.query.QueryMethodEvaluationContextPro
 import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -198,7 +199,7 @@ class AggregationUtils {
 	@Nullable
 	static <T> T extractSimpleTypeResult(@Nullable Document source, Class<T> targetType, MongoConverter converter) {
 
-		if (source == null || source.isEmpty()) {
+		if (ObjectUtils.isEmpty(source)) {
 			return null;
 		}