/* Copyright (c) 2006-2012 by OpenLayers Contributors (see authors.txt for 
 * full list of contributors). Published under the Clear BSD license.  
 * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license. */

/**
 * @requires OpenLayers/Layer/XYZ.js
 */

/**
 * Class: OpenLayers.Layer.OSM
 * A class to access OpenStreetMap tiles. By default, uses the OpenStreetMap
 *    hosted tile.openstreetmap.org 'Mapnik' tileset. If you wish to use
 *    tiles@home / osmarender layer instead, you can pass a layer like:
 * 
 * (code)
 *     new OpenLayers.Layer.OSM("t@h", 
 *       "http://tah.openstreetmap.org/Tiles/tile/${z}/${x}/${y}.png"); 
 * (end)
 *
 * This layer defaults to Spherical Mercator.
 * 
 * Inherits from:
 *  - <OpenLayers.Layer.XYZ>
 */
OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.XYZ, {
     name: "OpenStreetMap",
     attribution: "Data CC-By-SA by <a href='http://openstreetmap.org/'>OpenStreetMap</a>",
     sphericalMercator: true,
     url: 'http://tile.openstreetmap.org/${z}/${x}/${y}.png',
     clone: function(obj) {
         if (obj == null) {
             obj = new OpenLayers.Layer.OSM(
                 this.name, this.url, this.getOptions());
         }
         obj = OpenLayers.Layer.XYZ.prototype.clone.apply(this, [obj]);
         return obj;
     },
     wrapDateLine: true,
     CLASS_NAME: "OpenLayers.Layer.OSM"
});