OpenStreetMap to OSM renaming

OSM is a well-known name, and is shorter than OpenStreetMap.

src/ol/source/osmsource.js

@@ -0,0 +1,71 @@
+goog.provide('ol.source.OSM');
+
+goog.require('ol.Attribution');
+goog.require('ol.source.XYZ');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {ol.source.OSMOptions=} opt_options Open Street Map options.
+ */
+ol.source.OSM = function(opt_options) {
+
+  var options = goog.isDef(opt_options) ? opt_options : {};
+
+  var attributions;
+  if (goog.isDef(options.attributions)) {
+    attributions = options.attributions;
+  } else if (goog.isDef(options.attribution)) {
+    attributions = [options.attribution];
+  } else {
+    attributions = ol.source.OSM.ATTRIBUTIONS;
+  }
+
+  var maxZoom = goog.isDef(options.maxZoom) ? options.maxZoom : 18;
+
+  var url = goog.isDef(options.url) ?
+      options.url : 'http://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+
+  goog.base(this, {
+    attributions: attributions,
+    crossOrigin: 'anonymous',
+    opaque: true,
+    maxZoom: maxZoom,
+    url: url
+  });
+
+};
+goog.inherits(ol.source.OSM, ol.source.XYZ);
+
+
+/**
+ * @const
+ * @type {ol.Attribution}
+ */
+ol.source.OSM.DATA_ATTRIBUTION = new ol.Attribution(
+    'Data &copy; <a href="http://www.openstreetmap.org/">OpenStreetMap</a> ' +
+    'contributors, ' +
+    '<a href="http://www.openstreetmap.org/copyright">ODbL</a>');
+
+
+/**
+ * @const
+ * @type {ol.Attribution}
+ */
+ol.source.OSM.TILE_ATTRIBUTION = new ol.Attribution(
+    'Tiles &copy; ' +
+    '<a href="http://www.openstreetmap.org/">OpenStreetMap</a> ' +
+    'contributors, ' +
+    '<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC BY-SA</a>');
+
+
+/**
+ * @const
+ * @type {Array.<ol.Attribution>}
+ */
+ol.source.OSM.ATTRIBUTIONS = [
+  ol.source.OSM.TILE_ATTRIBUTION,
+  ol.source.OSM.DATA_ATTRIBUTION
+];