From d179539a316166d756ad959b5f52e9068a0af47d Mon Sep 17 00:00:00 2001
From: Greg Burd <gburd@onshape.com>
Date: Mon, 23 Apr 2018 12:37:49 -0400
Subject: [PATCH] Only unwrap cache implementation for clients who are
 expecting the Map interface.

---
 src/main/java/net/helenus/core/cache/MapCache.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/helenus/core/cache/MapCache.java b/src/main/java/net/helenus/core/cache/MapCache.java
index 72c0326..a9b13e7 100644
--- a/src/main/java/net/helenus/core/cache/MapCache.java
+++ b/src/main/java/net/helenus/core/cache/MapCache.java
@@ -390,7 +390,10 @@ public class MapCache<K, V> implements Cache<K, V> {
   @Override
   @SuppressWarnings("unchecked")
   public <T> T unwrap(Class<T> clazz) {
-    return (T) map;
+    if (Map.class.isAssignableFrom(clazz)) {
+        return (T) map;
+    }
+    return null;
   }
 
   /** {@inheritDoc} */