s/TileUrl/TileUrlFunction/

src/ol/tileurlfunction.js

@@ -0,0 +1,36 @@
+goog.provide('ol.TileUrlFunction');
+goog.provide('ol.TileUrlFunctionType');
+
+goog.require('goog.math');
+goog.require('ol.TileCoord');
+
+
+/**
+ * @typedef {function(ol.TileCoord): string}
+ */
+ol.TileUrlFunctionType;
+
+
+/**
+ * @param {string} template Template.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTemplate = function(template) {
+  return function(tileCoord) {
+    return template.replace(/\{z\}/, tileCoord.z)
+                   .replace(/\{x\}/, tileCoord.x)
+                   .replace(/\{y\}/, tileCoord.y);
+  };
+};
+
+
+/**
+ * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
+  return function(tileCoord) {
+    var index = goog.math.modulo(tileCoord.hash(), tileUrlFunctions.length);
+    return tileUrlFunctions[index](tileCoord);
+  };
+};