From 92bdee08a72b06d96a312fd66b879e7a95e3ee2f Mon Sep 17 00:00:00 2001
From: Aleksi Hietanen <aleksi@vaadin.com>
Date: Wed, 10 May 2017 15:17:10 +0300
Subject: Wrap DataCommunicator#getBackEndSorting in an unmodifiable list

---
 server/src/main/java/com/vaadin/data/provider/DataCommunicator.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'server')

diff --git a/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java b/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
index ad95bfa592..2ab8c2d00e 100644
--- a/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
+++ b/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
@@ -18,6 +18,7 @@ package com.vaadin.data.provider;
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
@@ -550,11 +551,11 @@ public class DataCommunicator<T> extends AbstractExtension {
     /**
      * Returns the {@link QuerySortOrder} to use with backend sorting.
      *
-     * @return list of sort order information to pass to a query
+     * @return an unmodifiable list of sort order information to pass to a query
      * @since 8.0.6
      */
     public List<QuerySortOrder> getBackEndSorting() {
-        return backEndSorting;
+        return Collections.unmodifiableList(backEndSorting);
     }
 
     /**
-- 
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