Allow whether we're persisting to be queried.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5672 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/Config.as

@@ -45,6 +45,9 @@ public class Config extends EventDispatcher
         setPath(path);
     }
 
+    /**
+     * Set the path, if null then we aren't persisting settings.
+     */
     public function setPath (path :String) :void
     {
         _so = (path == null) ? null : SharedObject.getLocal("config_" + path, "/");
@@ -56,6 +59,14 @@ public class Config extends EventDispatcher
         }
     }
 
+    /**
+     * Are we persisting settings?
+     */
+    public function isPersisting () :Boolean
+    {
+        return (_so != null);
+    }
+
     /**
      * Fetches and returns the value for the specified configuration property.
      */