openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
166 lines (141 loc) • 4.05 kB
JavaScript
goog.provide('ol.source.CartoDB');
goog.require('ol');
goog.require('ol.obj');
goog.require('ol.source.State');
goog.require('ol.source.XYZ');
/**
* @classdesc
* Layer source for the CartoDB tiles.
*
* @constructor
* @extends {ol.source.XYZ}
* @param {olx.source.CartoDBOptions} options CartoDB options.
* @api
*/
ol.source.CartoDB = function(options) {
/**
* @type {string}
* @private
*/
this.account_ = options.account;
/**
* @type {string}
* @private
*/
this.mapId_ = options.map || '';
/**
* @type {!Object}
* @private
*/
this.config_ = options.config || {};
/**
* @type {!Object.<string, CartoDBLayerInfo>}
* @private
*/
this.templateCache_ = {};
ol.source.XYZ.call(this, {
attributions: options.attributions,
cacheSize: options.cacheSize,
crossOrigin: options.crossOrigin,
logo: options.logo,
maxZoom: options.maxZoom !== undefined ? options.maxZoom : 18,
minZoom: options.minZoom,
projection: options.projection,
state: ol.source.State.LOADING,
wrapX: options.wrapX
});
this.initializeMap_();
};
ol.inherits(ol.source.CartoDB, ol.source.XYZ);
/**
* Returns the current config.
* @return {!Object} The current configuration.
* @api
*/
ol.source.CartoDB.prototype.getConfig = function() {
return this.config_;
};
/**
* Updates the carto db config.
* @param {Object} config a key-value lookup. Values will replace current values
* in the config.
* @api
*/
ol.source.CartoDB.prototype.updateConfig = function(config) {
ol.obj.assign(this.config_, config);
this.initializeMap_();
};
/**
* Sets the CartoDB config
* @param {Object} config In the case of anonymous maps, a CartoDB configuration
* object.
* If using named maps, a key-value lookup with the template parameters.
* @api
*/
ol.source.CartoDB.prototype.setConfig = function(config) {
this.config_ = config || {};
this.initializeMap_();
};
/**
* Issue a request to initialize the CartoDB map.
* @private
*/
ol.source.CartoDB.prototype.initializeMap_ = function() {
var paramHash = JSON.stringify(this.config_);
if (this.templateCache_[paramHash]) {
this.applyTemplate_(this.templateCache_[paramHash]);
return;
}
var mapUrl = 'https://' + this.account_ + '.cartodb.com/api/v1/map';
if (this.mapId_) {
mapUrl += '/named/' + this.mapId_;
}
var client = new XMLHttpRequest();
client.addEventListener('load', this.handleInitResponse_.bind(this, paramHash));
client.addEventListener('error', this.handleInitError_.bind(this));
client.open('POST', mapUrl);
client.setRequestHeader('Content-type', 'application/json');
client.send(JSON.stringify(this.config_));
};
/**
* Handle map initialization response.
* @param {string} paramHash a hash representing the parameter set that was used
* for the request
* @param {Event} event Event.
* @private
*/
ol.source.CartoDB.prototype.handleInitResponse_ = function(paramHash, 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 {CartoDBLayerInfo} */(JSON.parse(client.responseText));
} catch (err) {
this.setState(ol.source.State.ERROR);
return;
}
this.applyTemplate_(response);
this.templateCache_[paramHash] = response;
this.setState(ol.source.State.READY);
} else {
this.setState(ol.source.State.ERROR);
}
};
/**
* @private
* @param {Event} event Event.
*/
ol.source.CartoDB.prototype.handleInitError_ = function(event) {
this.setState(ol.source.State.ERROR);
};
/**
* Apply the new tile urls returned by carto db
* @param {CartoDBLayerInfo} data Result of carto db call.
* @private
*/
ol.source.CartoDB.prototype.applyTemplate_ = function(data) {
var tilesUrl = 'https://' + data.cdn_url.https + '/' + this.account_ +
'/api/v1/map/' + data.layergroupid + '/{z}/{x}/{y}.png';
this.setUrl(tilesUrl);
};