MultiPoints shall only contain points.

src/ol/geom/MultiPoint.js

@@ -12,7 +12,12 @@ goog.require('ol.geom.Collection');
  * @constructor
  */
 ol.geom.MultiPoint = function(points) {
-    this.setComponents(points);
+    this.setTypeWhitelist([ol.geom.Point]);
+    this.setTypeBlacklist([ol.geom.Geometry]);
+    if (arguments.length === 1 && goog.isDef(points)) {
+        this.setPoints(points);
+    }
+    
 };
 
 goog.inherits(ol.geom.MultiPoint, ol.geom.Collection);

test/spec/ol/geom/MultiPoint.test.js

@@ -25,6 +25,14 @@ describe("ol.geom.MultiPoint", function() {
         expect( mp ).toBeA( ol.geom.MultiPoint );
     });
     
+    it("cannot be constructed with component-types other than 'ol.geom.Point'", function() {
+        expect(function(){
+            mp = new ol.geom.MultiPoint([
+                new ol.geom.LineString()
+            ]);
+        }).toThrow();
+    });
+    
     it("inherits from ol.geom.Geometry", function() {
         expect( mp ).toBeA( ol.geom.Geometry );
     });
@@ -84,6 +92,17 @@ describe("ol.geom.MultiPoint", function() {
         
     });
     
+    it("can only add ol.geom.Point as components", function() {
+        expect(function(){
+            mp.addComponent(
+                new ol.geom.LineString([
+                    new ol.geom.Point(30,40),
+                    new ol.geom.Point(50,60)
+                ])
+            );
+        }).toThrow();
+    });
+    
     it("has a method to remove points", function() {
         mp.setPoints([
             new ol.geom.Point(0,10),