From f68631d61c82e9ec3fcd6be9a7a3b6a2695b8e18 Mon Sep 17 00:00:00 2001
From: Frederic Junod <frederic.junod@camptocamp.com>
Date: Mon, 13 Jan 2014 10:21:30 +0100
Subject: [PATCH] Use goog.asserts.assertInstanceof to check the getSource
 return type

See 1499af397d9852eded193a8b06ea9d8bad71a49f
---
 src/ol/interaction/drawinteraction.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index 61593a47e6..0dbc050bd9 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -16,6 +16,7 @@ goog.require('ol.geom.Point');
 goog.require('ol.geom.Polygon');
 goog.require('ol.interaction.Interaction');
 goog.require('ol.render.FeaturesOverlay');
+goog.require('ol.source.Vector');
 goog.require('ol.style.Circle');
 goog.require('ol.style.Fill');
 goog.require('ol.style.Stroke');
@@ -425,7 +426,9 @@ ol.interaction.Draw.prototype.finishDrawing_ = function(event) {
   }
 
   if (!goog.isNull(this.layer_)) {
-    this.layer_.getSource().addFeature(sketchFeature);
+    var vectorSource = this.layer_.getSource();
+    goog.asserts.assertInstanceof(vectorSource, ol.source.Vector);
+    vectorSource.addFeature(sketchFeature);
   }
 };