Add ol.source.XYZ#setUrl and friends

src/ol/source/xyzsource.js

@@ -18,33 +18,12 @@ ol.source.XYZ = function(options) {
 
   var projection = options.projection || ol.proj.get('EPSG:3857');
 
-  /**
-   * @type {ol.TileUrlFunctionType}
-   */
-  var tileUrlFunction = ol.TileUrlFunction.nullTileUrlFunction;
-  // FIXME use goog.nullFunction ?
-  if (goog.isDef(options.tileUrlFunction)) {
-    tileUrlFunction = options.tileUrlFunction;
-  } else if (goog.isDef(options.urls)) {
-    tileUrlFunction = ol.TileUrlFunction.createFromTemplates(options.urls);
-  } else if (goog.isDef(options.url)) {
-    tileUrlFunction = ol.TileUrlFunction.createFromTemplates(
-        ol.TileUrlFunction.expandUrl(options.url));
-  }
-
   var maxZoom = goog.isDef(options.maxZoom) ? options.maxZoom : 18;
 
   var tileGrid = new ol.tilegrid.XYZ({
     maxZoom: maxZoom
   });
 
-  var tileCoordTransform = tileGrid.createTileCoordTransform({
-    extent: options.extent
-  });
-
-  tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
-      tileCoordTransform, tileUrlFunction);
-
   goog.base(this, {
     attributions: options.attributions,
     crossOrigin: options.crossOrigin,
@@ -52,8 +31,51 @@ ol.source.XYZ = function(options) {
     logo: options.logo,
     projection: projection,
     tileGrid: tileGrid,
-    tileUrlFunction: tileUrlFunction
+    tileUrlFunction: ol.TileUrlFunction.nullTileUrlFunction
   });
 
+  /**
+   * @private
+   * @type {ol.TileCoordTransformType}
+   */
+  this.tileCoordTransform_ = tileGrid.createTileCoordTransform({
+    extent: options.extent
+  });
+
+  if (goog.isDef(options.tileUrlFunction)) {
+    this.setTileUrlFunction(options.tileUrlFunction);
+  } else if (goog.isDef(options.urls)) {
+    this.setUrls(options.urls);
+  } else if (goog.isDef(options.url)) {
+    this.setUrl(options.url);
+  }
+
 };
 goog.inherits(ol.source.XYZ, ol.source.TileImage);
+
+
+/**
+ * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
+ */
+ol.source.XYZ.prototype.setTileUrlFunction = function(tileUrlFunction) {
+  goog.base(this, 'setTileUrlFunction',
+      ol.TileUrlFunction.withTileCoordTransform(
+          this.tileCoordTransform_, tileUrlFunction));
+};
+
+
+/**
+ * @param {string} url URL.
+ */
+ol.source.XYZ.prototype.setUrl = function(url) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(
+      ol.TileUrlFunction.expandUrl(url)));
+};
+
+
+/**
+ * @param {Array.<string>} urls URLs.
+ */
+ol.source.XYZ.prototype.setUrls = function(urls) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(urls));
+};