Source: api/ShapefileMapService.js

define([
    'dojo/_base/declare',
    'dojo/_base/lang',
    'dojo/_base/array',
    'spw/api/DataMapService',
    'spw/api/ShapefileLayer'
],
function(declare, lang, array, DataMapService, ShapefileLayer) {

    // polyfill
    if (!Array.from) {
        Array.from = (function () {
            var toStr = Object.prototype.toString;
            var isCallable = function (fn) {
                return typeof fn === 'function' || toStr.call(fn) === '[object Function]';
            };
            var toInteger = function (value) {
                var number = Number(value);
                if (isNaN(number)) { return 0; }
                if (number === 0 || !isFinite(number)) { return number; }
                return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
            };
            var maxSafeInteger = Math.pow(2, 53) - 1;
            var toLength = function (value) {
                var len = toInteger(value);
                return Math.min(Math.max(len, 0), maxSafeInteger);
            };

            // The length property of the from method is 1.
            return function from(arrayLike/*, mapFn, thisArg */) {
                // 1. Let C be the this value.
                var C = this;

                // 2. Let items be ToObject(arrayLike).
                var items = Object(arrayLike);

                // 3. ReturnIfAbrupt(items).
                if (arrayLike == null) {
                    throw new TypeError("Array.from requires an array-like object - not null or undefined");
                }

                // 4. If mapfn is undefined, then let mapping be false.
                var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
                var T;
                if (typeof mapFn !== 'undefined') {
                    // 5. else
                    // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
                    if (!isCallable(mapFn)) {
                        throw new TypeError('Array.from: when provided, the second argument must be a function');
                    }

                    // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
                    if (arguments.length > 2) {
                        T = arguments[2];
                    }
                }

                // 10. Let lenValue be Get(items, "length").
                // 11. Let len be ToLength(lenValue).
                var len = toLength(items.length);

                // 13. If IsConstructor(C) is true, then
                // 13. a. Let A be the result of calling the [[Construct]] internal method of C with an argument list containing the single item len.
                // 14. a. Else, Let A be ArrayCreate(len).
                var A = isCallable(C) ? Object(new C(len)) : new Array(len);

                // 16. Let k be 0.
                var k = 0;
                // 17. Repeat, while k < len… (also steps a - h)
                var kValue;
                while (k < len) {
                    kValue = items[k];
                    if (mapFn) {
                        A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k);
                    } else {
                        A[k] = kValue;
                    }
                    k += 1;
                }
                // 18. Let putStatus be Put(A, "length", len, true).
                A.length = len;
                // 20. Return A.
                return A;
            };
        }());
    }

    /**
     * @class spw.api.ShapefileMapService
     * @classdesc Service du viewer permettant d'afficher des données depuis un shapefile
     * @extends {spw.api.DataMapService}
     */
    var ShapefileMapService = declare('spw.api.ShapefileMapService', [DataMapService], /** @lends spw.api.ShapefileMapService.prototype */ {

        getServiceConfig: function(toKeep) {
            toKeep = toKeep || this._propertiesToKeep;

            var cfg = null;

            for (var property in this) {
                if (toKeep.indexOf(property) < 0) {
                    continue;
                }

                cfg = cfg || {};

                cfg[property] = this[property];
            }

            var shpInfo = lang.clone(this.shpInfo);
            shpInfo.shpData = Array.from(new Uint8Array(this.shpInfo.shpData));
            cfg.shpInfo = shpInfo;

            cfg.layers = [];

            array.forEach(this.get('mapServiceLayers'), lang.hitch(this, function(mapServiceLayer) {
                cfg.layers.push({
                    layerId: mapServiceLayer.get('layerId'),
                    defaultVisibility: mapServiceLayer.get('defaultVisibility')
                });
            }));

            return cfg;
        },

        constructor: function(opt) {
            this._options = opt;
        },

        /**
         * Crée le layer Esri sur base de la configuration du MapService.
         * @memberOf spw.api.MapService
         */
        createMapLayer: function() {
            if (this.shpInfo && this.shpInfo.shpData instanceof Array) {
                this.shpInfo.shpData = new Uint8Array(this.shpInfo.shpData).buffer;
            }
            this.layer = new ShapefileLayer(lang.mixin({
                id: this.serviceId,
                _mapService: this
            }, this._options, this.shpInfo));

            this.inherited(arguments);
        }

    });

    return ShapefileMapService;

});