Add GML2 serializer for MultiSurface and MultiPolygon

src/ol/format/gml2.js

@@ -596,6 +596,33 @@ ol.format.GML2.prototype.writeLinearRing_ = function(node, geometry, objectStack
  * @private
  */
 ol.format.GML2.prototype.writeMultiSurfaceOrPolygon_ = function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  var srsName = context['srsName'];
+  var surface = context['surface'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var polygons = geometry.getPolygons();
+  ol.xml.pushSerializeAndPop({node: node, srsName: srsName, surface: surface},
+      ol.format.GML2.SURFACEORPOLYGONMEMBER_SERIALIZERS_,
+      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, polygons,
+      objectStack, undefined, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Polygon} polygon Polygon geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML2.prototype.writeSurfaceOrPolygonMember_ = function(node, polygon, objectStack) {
+  var child = this.GEOMETRY_NODE_FACTORY_(
+      polygon, objectStack);
+  if (child) {
+    node.appendChild(child);
+    this.writeSurfaceOrPolygon_(child, polygon, objectStack);
+  }
 };
 
 
@@ -603,6 +630,7 @@ ol.format.GML2.prototype.writeMultiSurfaceOrPolygon_ = function(node, geometry,
  * @param {Node} node Node.
  * @param {ol.Extent} extent Extent.
  * @param {Array.<*>} objectStack Node stack.
+ * @private
  */
 ol.format.GML2.prototype.writeEnvelope = function(node, extent, objectStack) {
 };
@@ -705,3 +733,18 @@ ol.format.GML2.MULTIGEOMETRY_TO_MEMBER_NODENAME_ = {
   'MultiPolygon': 'polygonMember',
   'MultiSurface': 'surfaceMember'
 };
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
+ * @private
+ */
+ol.format.GML2.SURFACEORPOLYGONMEMBER_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'surfaceMember': ol.xml.makeChildAppender(
+        ol.format.GML2.prototype.writeSurfaceOrPolygonMember_),
+    'polygonMember': ol.xml.makeChildAppender(
+        ol.format.GML2.prototype.writeSurfaceOrPolygonMember_)
+  }
+};

test/spec/ol/format/gml.test.js

@@ -285,6 +285,41 @@ describe('ol.format.GML2', function() {
 
       expect(node).to.xmleql(ol.xml.parse(expected));
     });
+
+    it('can serialize a Multi Polygon', function() {
+      var expected =
+        '<layer xmlns="http://www.openlayers.org/" fid="1">' +
+        '  <geometry>' +
+        '     <MultiPolygon xmlns="http://www.opengis.net/gml" ' +
+        '                 srsName="EPSG:4326">' +
+        '       <polygonMember>' +
+        '         <Polygon srsName="EPSG:4326">' +
+        '           <outerBoundaryIs>' +
+        '             <LinearRing srsName="EPSG:4326">' +
+        '               <coordinates ' +
+        '                        decimal="." cs="," ts=" ">' +
+        '                  2,1.1 4.2,3 6,5.2' +
+        '               </coordinates>' +
+        '             </LinearRing>' +
+        '           </outerBoundaryIs>' +
+        '         </Polygon>' +
+        '       </polygonMember>' +
+        '      </MultiPolygon>' +
+        '    </geometry>' +
+        '  </layer>';
+
+      var feature = new ol.Feature({
+        geometry: new ol.geom.MultiPolygon([[[[1.1, 2], [3, 4.2], [5.2, 6]]]])
+      });
+      feature.setId(1);
+      var objectStack = [{
+        featureNS: featureNS,
+        srsName: 'EPSG:4326'
+      }];
+      format.writeFeatureElement(node, feature, objectStack);
+
+      expect(node).to.xmleql(ol.xml.parse(expected));
+    });
   });
 });