Allow multi* geometries in Collections/collections.

src/ol/geom/Collection.js

@@ -28,7 +28,12 @@ ol.geom.Collection = function(components) {
      * @private
      * @type {Array.<Function>}
      */
-    this.typeWhitelist_ = [];
+    this.typeWhitelist_ = [
+        ol.geom.MultiPoint,
+        ol.geom.MultiLineString
+        // TODO uncomment when implemented
+        // ,ol.geom.MultiPolygon
+    ];
 
     /**
      * @private

test/spec/api/geom/collection.test.js

@@ -51,6 +51,28 @@ describe("ol.geom.collection", function() {
                 expect( firstComponent.x() + ',' + firstComponent.y() ).toBe( '24,7' );
             });
 
+            it("cannot add 'ol.geom.collection'", function(){
+                expect(function(){
+                    c.add(
+                        ol.geom.collection([
+                            ol.geom.point([5,25]),
+                            ol.geom.point([6,36])
+                        ])
+                    );
+                }).toThrow();
+            });
+
+            it("allows 'ol.geom.multi*' (even though these are technically of ol.geom.collections)", function(){
+                expect(function(){
+                    c.add(
+                        ol.geom.multipoint([
+                            ol.geom.point([5,25]),
+                            ol.geom.point([6,36])
+                        ])
+                    );
+                }).not.toThrow();
+            });
+
             it("the index is functional", function(){
                 var p = ol.geom.point([24,7]);
                 c.add(p, 1);

test/spec/ol/geom/Collection.test.js

@@ -113,6 +113,17 @@ describe("ol.geom.Collection", function() {
         }).toThrow();
     });
 
+    it("allows instances of 'ol.geom.Multi*' (even though these are subclasses of ol.geom.Collection)", function(){
+        expect(function(){
+            c.addComponent(
+                new ol.geom.MultiPoint([
+                    new ol.geom.Point(5,25),
+                    new ol.geom.Point(6,36)
+                ])
+            );
+        }).not.toThrow();
+    });
+
     it("has a method to remove components", function() {
         c.setComponents([
             new ol.geom.Point(0,10),