From 1c8bc7132d980c1ff2dbd6b9af579c3b2fd8c63e Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sun, 3 Apr 2016 19:22:48 -0400
Subject: General code refactoring and maintenance

---
 BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java b/BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java
index ca0578d..4f194f3 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/gen/RandomGrammar.java
@@ -62,6 +62,10 @@ public class RandomGrammar<E> extends WeightedGrammar<E> {
 	 *            The cases to add for this rule.
 	 */
 	public void makeRule(E rule, FunctionalList<FunctionalList<E>> cases) {
+		if (cases == null) {
+			throw new NullPointerException("Cases must not be null");
+		}
+
 		super.addRule(rule);
 
 		cases.forEach(currentCase -> super.addCase(rule, 1, currentCase));
-- 
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