Make attributions an array of strings rather than a string

src/ol/tile/openstreetmap.js

@@ -25,21 +25,16 @@ goog.inherits(ol.layer.OpenStreetMap, ol.TileLayer);
  * @extends {ol.tilestore.XYZ}
  */
 ol.store.OpenStreetMap = function() {
+
   goog.base(this, 18, ol.TileUrlFunction.createFromTemplates([
     'http://a.tile.openstreetmap.org/{z}/{x}/{y}.png',
     'http://b.tile.openstreetmap.org/{z}/{x}/{y}.png',
     'http://c.tile.openstreetmap.org/{z}/{x}/{y}.png'
-  ]));
+  ]), [
+    '&copy; <a href="http://www.openstreetmap.org">OpenStreetMap</a> ' +
+        'contributors, ' +
+        '<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC BY-SA</a>'
+  ]);
+
 };
 goog.inherits(ol.store.OpenStreetMap, ol.tilestore.XYZ);
-
-
-/**
- * @inheritDoc
- */
-ol.store.OpenStreetMap.prototype.getAttribution =
-    function(extent, resolution) {
-  return '&copy; <a href="http://www.openstreetmap.org">OpenStreetMap</a> ' +
-      'contributors, ' +
-      '<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC BY-SA</a>';
-};

src/ol/tile/xyz.js

@@ -50,7 +50,7 @@ goog.inherits(ol.tilegrid.XYZ, ol.TileGrid);
  */
 ol.layer.XYZ = function(maxZoom, tileUrlFunction, opt_crossOrigin, opt_values) {
   var tileStore = new ol.tilestore.XYZ(
-      maxZoom, tileUrlFunction, opt_crossOrigin);
+      maxZoom, tileUrlFunction, undefined, opt_crossOrigin);
   goog.base(this, tileStore, opt_values);
 };
 goog.inherits(ol.layer.XYZ, ol.TileLayer);
@@ -62,11 +62,11 @@ goog.inherits(ol.layer.XYZ, ol.TileLayer);
  * @extends {ol.TileStore}
  * @param {number} maxZoom Maximum zoom.
  * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
- * @param {string=} opt_attribution Attribution.
+ * @param {Array.<string>=} opt_attributions Attributions.
  * @param {string=} opt_crossOrigin Cross origin.
  */
 ol.tilestore.XYZ =
-    function(maxZoom, tileUrlFunction, opt_attribution, opt_crossOrigin) {
+    function(maxZoom, tileUrlFunction, opt_attributions, opt_crossOrigin) {
 
   var projection = ol.Projection.getFromCode('EPSG:3857');
   var tileGrid = new ol.tilegrid.XYZ(maxZoom);
@@ -87,5 +87,20 @@ ol.tilestore.XYZ =
   goog.base(
       this, projection, tileGrid, tileUrlFunction2, extent, opt_crossOrigin);
 
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.attributions_ = goog.isDef(opt_attributions) ? opt_attributions : [];
+
 };
 goog.inherits(ol.tilestore.XYZ, ol.TileStore);
+
+
+/**
+ * @inheritDoc
+ */
+ol.tilestore.XYZ.prototype.getAttributions = function(extent, resolution) {
+  return this.attributions_;
+};