# all files / ol/source/ tilejson.js

96.88% Statements 62/64
76% Branches 19/25
100% Functions 6/6
96.88% Lines 62/64

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     // FIXME check order of async callbacks

    /**
     * @see http://mapbox.com/developers/api/
     */

    goog.provide('ol.source.TileJSON');

    goog.require('ol');
    goog.require('ol.Attribution');
    goog.require('ol.TileUrlFunction');
    goog.require('ol.asserts');
    goog.require('ol.extent');
    goog.require('ol.net');
    goog.require('ol.proj');
    goog.require('ol.source.State');
    goog.require('ol.source.TileImage');
    goog.require('ol.tilegrid');

    /**
     * @classdesc
     * Layer source for tile data in TileJSON format.
     *
     * @constructor
     * @extends {ol.source.TileImage}
     * @param {olx.source.TileJSONOptions} options TileJSON options.
     * @api
     */
    ol.source.TileJSON = function(options) {

      /**
       * @type {TileJSON}
       * @private
       */
      this.tileJSON_ = null;

      ol.source.TileImage.call(this, {
        attributions: options.attributions,
        cacheSize: options.cacheSize,
        crossOrigin: options.crossOrigin,
        projection: ol.proj.get('EPSG:3857'),
        reprojectionErrorThreshold: options.reprojectionErrorThreshold,
        state: ol.source.State.LOADING,
        tileLoadFunction: options.tileLoadFunction,
        wrapX: options.wrapX !== undefined ? options.wrapX : true
      });

      if (options.url) {
        Iif (options.jsonp) {
          ol.net.jsonp(options.url, this.handleTileJSONResponse.bind(this),
              this.handleTileJSONError.bind(this));
        } else {
          var client = new XMLHttpRequest();
          client.addEventListener('load', this.onXHRLoad_.bind(this));
          client.addEventListener('error', this.onXHRError_.bind(this));
          client.open('GET', options.url);
          client.send();
        }
      } else Eif (options.tileJSON) {
        this.handleTileJSONResponse(options.tileJSON);
      } else {
        ol.asserts.assert(false, 51); // Either `url` or `tileJSON` options must be provided
      }

    };
    ol.inherits(ol.source.TileJSON, ol.source.TileImage);

    /**
     * @private
     * @param {Event} event The load event.
     */
    ol.source.TileJSON.prototype.onXHRLoad_ = function(event) {
      var client = /** @type {XMLHttpRequest} */ (event.target);
      // status will be 0 for file:// urls
      if (!client.status || client.status >= 200 && client.status < 300) {
        var response;
        try {
          response = /** @type {TileJSON} */(JSON.parse(client.responseText));
        } catch (err) {
          this.handleTileJSONError();
          return;
        }
        this.handleTileJSONResponse(response);
      } else {
        this.handleTileJSONError();
      }
    };

    /**
     * @private
     * @param {Event} event The error event.
     */
    ol.source.TileJSON.prototype.onXHRError_ = function(event) {
      this.handleTileJSONError();
    };

    /**
     * @return {TileJSON} The tilejson object.
     * @api
     */
    ol.source.TileJSON.prototype.getTileJSON = function() {
      return this.tileJSON_;
    };

    /**
     * @protected
     * @param {TileJSON} tileJSON Tile JSON.
     */
    ol.source.TileJSON.prototype.handleTileJSONResponse = function(tileJSON) {

      var epsg4326Projection = ol.proj.get('EPSG:4326');

      var sourceProjection = this.getProjection();
      var extent;
      Eif (tileJSON.bounds !== undefined) {
        var transform = ol.proj.getTransformFromProjections(
            epsg4326Projection, sourceProjection);
        extent = ol.extent.applyTransform(tileJSON.bounds, transform);
      }

      var minZoom = tileJSON.minzoom || 0;
      var maxZoom = tileJSON.maxzoom || 22;
      var tileGrid = ol.tilegrid.createXYZ({
        extent: ol.tilegrid.extentFromProjection(sourceProjection),
        maxZoom: maxZoom,
        minZoom: minZoom
      });
      this.tileGrid = tileGrid;

      this.tileUrlFunction =
          ol.TileUrlFunction.createFromTemplates(tileJSON.tiles, tileGrid);

      if (tileJSON.attribution !== undefined && !this.getAttributions()) {
        var attributionExtent = extent !== undefined ?
          extent : epsg4326Projection.getExtent();
        /** @type {Object.<string, Array.<ol.TileRange>>} */
        var tileRanges = {};
        var z, zKey;
        for (z = minZoom; z <= maxZoom; ++z) {
          zKey = z.toString();
          tileRanges[zKey] =
              [tileGrid.getTileRangeForExtentAndZ(attributionExtent, z)];
        }
        this.setAttributions([
          new ol.Attribution({
            html: tileJSON.attribution,
            tileRanges: tileRanges
          })
        ]);
      }
      this.tileJSON_ = tileJSON;
      this.setState(ol.source.State.READY);

    };

    /**
     * @protected
     */
    ol.source.TileJSON.prototype.handleTileJSONError = function() {
      this.setState(ol.source.State.ERROR);
    };