From 497558d2689acfbbffafc90974624a85b64f1089 Mon Sep 17 00:00:00 2001
From: sjfink <sjfink@f5eafffb-2e1d-0410-98e4-8ec43c5233c4>
Date: Mon, 7 Jan 2008 19:40:20 +0000
Subject: [PATCH] add a check for IllegalArgumentException

git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@2304 f5eafffb-2e1d-0410-98e4-8ec43c5233c4
---
 .../src/com/ibm/wala/util/intset/SparseIntSet.java             | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/com.ibm.wala.core/src/com/ibm/wala/util/intset/SparseIntSet.java b/com.ibm.wala.core/src/com/ibm/wala/util/intset/SparseIntSet.java
index 761157120..082050e0c 100644
--- a/com.ibm.wala.core/src/com/ibm/wala/util/intset/SparseIntSet.java
+++ b/com.ibm.wala.core/src/com/ibm/wala/util/intset/SparseIntSet.java
@@ -349,6 +349,9 @@ public class SparseIntSet implements IntSet {
   }
 
   public IntSet intersection(IntSet that) {
+    if (that == null) {
+      throw new IllegalArgumentException("that == null");
+    }
     if (that instanceof SparseIntSet) {
       MutableSparseIntSet temp = MutableSparseIntSet.make(this);
       temp.intersectWith((SparseIntSet) that);