# all files / ol/source/ stamen.js

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

    goog.require('ol');
    goog.require('ol.Attribution');
    goog.require('ol.source.OSM');
    goog.require('ol.source.XYZ');

    /**
     * @classdesc
     * Layer source for the Stamen tile server.
     *
     * @constructor
     * @extends {ol.source.XYZ}
     * @param {olx.source.StamenOptions} options Stamen options.
     * @api
     */
    ol.source.Stamen = function(options) {
      var i = options.layer.indexOf('-');
      var provider = i == -1 ? options.layer : options.layer.slice(0, i);
      var providerConfig = ol.source.Stamen.ProviderConfig[provider];

      var layerConfig = ol.source.Stamen.LayerConfig[options.layer];

      var url = options.url !== undefined ? options.url :
        'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
          '/{z}/{x}/{y}.' + layerConfig.extension;

      ol.source.XYZ.call(this, {
        attributions: ol.source.Stamen.ATTRIBUTIONS,
        cacheSize: options.cacheSize,
        crossOrigin: 'anonymous',
        maxZoom: options.maxZoom != undefined ? options.maxZoom : providerConfig.maxZoom,
        minZoom: options.minZoom != undefined ? options.minZoom : providerConfig.minZoom,
        opaque: layerConfig.opaque,
        reprojectionErrorThreshold: options.reprojectionErrorThreshold,
        tileLoadFunction: options.tileLoadFunction,
        url: url,
        wrapX: options.wrapX
      });
    };
    ol.inherits(ol.source.Stamen, ol.source.XYZ);

    /**
     * @const
     * @type {Array.<ol.Attribution>}
     */
    ol.source.Stamen.ATTRIBUTIONS = [
      new ol.Attribution({
        html: 'Map tiles by <a href="https://stamen.com/">Stamen Design</a>, ' +
            'under <a href="https://creativecommons.org/licenses/by/3.0/">CC BY' +
            ' 3.0</a>.'
      }),
      ol.source.OSM.ATTRIBUTION
    ];

    /**
     * @type {Object.<string, {extension: string, opaque: boolean}>}
     */
    ol.source.Stamen.LayerConfig = {
      'terrain': {
        extension: 'jpg',
        opaque: true
      },
      'terrain-background': {
        extension: 'jpg',
        opaque: true
      },
      'terrain-labels': {
        extension: 'png',
        opaque: false
      },
      'terrain-lines': {
        extension: 'png',
        opaque: false
      },
      'toner-background': {
        extension: 'png',
        opaque: true
      },
      'toner': {
        extension: 'png',
        opaque: true
      },
      'toner-hybrid': {
        extension: 'png',
        opaque: false
      },
      'toner-labels': {
        extension: 'png',
        opaque: false
      },
      'toner-lines': {
        extension: 'png',
        opaque: false
      },
      'toner-lite': {
        extension: 'png',
        opaque: true
      },
      'watercolor': {
        extension: 'jpg',
        opaque: true
      }
    };

    /**
     * @type {Object.<string, {minZoom: number, maxZoom: number}>}
     */
    ol.source.Stamen.ProviderConfig = {
      'terrain': {
        minZoom: 4,
        maxZoom: 18
      },
      'toner': {
        minZoom: 0,
        maxZoom: 20
      },
      'watercolor': {
        minZoom: 1,
        maxZoom: 16
      }
    };