From 689f02774901707d5597ef028fd876584d9bddcd Mon Sep 17 00:00:00 2001
From: Yegor Kozlov <yegor@apache.org>
Date: Sat, 19 Oct 2013 14:12:15 +0000
Subject: [PATCH] Patch 55611 - Performance improvement in
 DateUtil.isADateFormat(int, String)

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1533768 13f79535-47bb-0310-9956-ffa450edef68
---
 src/java/org/apache/poi/ss/usermodel/DateUtil.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/java/org/apache/poi/ss/usermodel/DateUtil.java b/src/java/org/apache/poi/ss/usermodel/DateUtil.java
index 49b5ad12d..6bd832dfb 100644
--- a/src/java/org/apache/poi/ss/usermodel/DateUtil.java
+++ b/src/java/org/apache/poi/ss/usermodel/DateUtil.java
@@ -299,7 +299,7 @@ public class DateUtil {
      * @see #isInternalDateFormat(int)
      */
 
-    public static boolean isADateFormat(int formatIndex, String formatString) {
+    public static synchronized boolean isADateFormat(int formatIndex, String formatString) {
        
          if (formatString != null && formatIndex == lastFormatIndex && formatString.equals(lastFormatString)) {
            		return cached;