From 9e54ef68cb649b532f15c7b3c074f95150552f98 Mon Sep 17 00:00:00 2001
From: Javen O'Neal <onealj@apache.org>
Date: Sat, 11 Jun 2016 11:40:30 +0000
Subject: [PATCH] bug 57840: lazily compute hashCode; patch from Greg Woolsey

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1747881 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
index 22e1449db1..a0cd24d450 100644
--- a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
+++ b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
@@ -62,16 +62,18 @@ final class XSSFEvaluationSheet implements EvaluationSheet {
     private static class CellKey {
         private final int _row;
         private final int _col;
-        private final int _hash;
+        private int _hash = -1; //lazily computed
         
         protected CellKey(int row, int col) {
             _row = row;
             _col = col;
-            _hash = (17 * 37 + row) * 37 + col;
         }
         
         @Override
         public int hashCode() {
+            if ( _hash == -1 ) {
+                 _hash = (17 * 37 + _row) * 37 + _col;
+            }
             return _hash;
         }
         
-- 
2.39.5