s/ol3/ol/

src/ol/tileurlfunction.js

@@ -0,0 +1,94 @@
+goog.provide('ol.TileUrlFunction');
+goog.provide('ol.TileUrlFunctionType');
+
+goog.require('goog.math');
+goog.require('ol.TileCoord');
+
+
+/**
+ * @typedef {function(ol.TileCoord): (string|undefined)}
+ */
+ol.TileUrlFunctionType;
+
+
+/**
+ * @param {string} template Template.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTemplate = function(template) {
+  var match =
+      /\{(\d)-(\d)\}/.exec(template) || /\{([a-z])-([a-z])\}/.exec(template);
+  if (match) {
+    var templates = [];
+    var startCharCode = match[1].charCodeAt(0);
+    var stopCharCode = match[2].charCodeAt(0);
+    var charCode;
+    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
+      templates.push(template.replace(match[0], String.fromCharCode(charCode)));
+    }
+    return ol.TileUrlFunction.createFromTemplates(templates);
+  } else {
+    return function(tileCoord) {
+      if (goog.isNull(tileCoord)) {
+        return undefined;
+      } else {
+        return template.replace('{z}', tileCoord.z)
+                       .replace('{x}', tileCoord.x)
+                       .replace('{y}', tileCoord.y);
+      }
+    };
+  }
+};
+
+
+/**
+ * @param {Array.<string>} templates Templates.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTemplates = function(templates) {
+  return ol.TileUrlFunction.createFromTileUrlFunctions(
+      goog.array.map(templates, ol.TileUrlFunction.createFromTemplate));
+};
+
+
+/**
+ * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
+  return function(tileCoord) {
+    if (goog.isNull(tileCoord)) {
+      return undefined;
+    } else {
+      var index = goog.math.modulo(tileCoord.hash(), tileUrlFunctions.length);
+      return tileUrlFunctions[index](tileCoord);
+    }
+  };
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @return {string|undefined} Tile URL.
+ */
+ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord) {
+  return undefined;
+};
+
+
+/**
+ * @param {function(ol.TileCoord): ol.TileCoord} transformFn
+ *     Transform.function.
+ * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.withTileCoordTransform =
+    function(transformFn, tileUrlFunction) {
+  return function(tileCoord) {
+    if (goog.isNull(tileCoord)) {
+      return undefined;
+    } else {
+      return tileUrlFunction(transformFn(tileCoord));
+    }
+  };
+};