From 45c41537edfec26fbc73cbedb60a3beba4fc3c79 Mon Sep 17 00:00:00 2001
From: Sampo Niskanen <sampo.niskanen@iki.fi>
Date: Sat, 10 Jan 2015 18:38:47 +0200
Subject: [PATCH] Check that scripting engine supports Invocable before casting

---
 .../simulation/extension/impl/ScriptingExtension.java         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/src/net/sf/openrocket/simulation/extension/impl/ScriptingExtension.java b/core/src/net/sf/openrocket/simulation/extension/impl/ScriptingExtension.java
index d3d3380b3..3569d2aae 100644
--- a/core/src/net/sf/openrocket/simulation/extension/impl/ScriptingExtension.java
+++ b/core/src/net/sf/openrocket/simulation/extension/impl/ScriptingExtension.java
@@ -103,7 +103,9 @@ public class ScriptingExtension extends AbstractSimulationExtension {
 			throw new SimulationException("Invalid script: " + e.getMessage());
 		}
 		
-		// TODO: Check for implementation first
+		if (!(engine instanceof Invocable)) {
+			throw new SimulationException("The scripting language '" + getLanguage() + "' does not implement the Invocable interface");
+		}
 		return new ScriptingSimulationListener((Invocable) engine);
 	}