PolygonHierarchy.js

define([
        './defined'
    ], function(
        defined) {
    'use strict';

    /**
     * An hierarchy of linear rings which define a polygon and its holes.
     * The holes themselves may also have holes which nest inner polygons.
     * @alias PolygonHierarchy
     * @constructor
     *
     * @param {Cartesian3[]} [positions] A linear ring defining the outer boundary of the polygon or hole.
     * @param {PolygonHierarchy[]} [holes] An array of polygon hierarchies defining holes in the polygon.
     */
    function PolygonHierarchy(positions, holes) {
        /**
         * A linear ring defining the outer boundary of the polygon or hole.
         * @type {Cartesian3[]}
         */
        this.positions = defined(positions) ? positions : [];

        /**
         * An array of polygon hierarchies defining holes in the polygon.
         * @type {PolygonHierarchy[]}
         */
        this.holes = defined(holes) ? holes : [];
    }

    return PolygonHierarchy;
});