// getVessel.js
(function () {
  /* global AdventureJS A */
  var p = AdventureJS.Assets.Entity.prototype;
  /**
   * Get substance container. This is dodgy because, in theory,
   * any aspect can contain substance, but in practice we only
   * use "in".
   * @memberOf AdventureJS.Assets.Entity
   * @method AdventureJS.Assets.Entity#getVessel
   * @return {Object|Null}
   */
  p.getVessel = function Entity_getVessel() {
    let aspect = "in";
    if (
      !this.getAspectAt(aspect) ||
      !this.aspects[aspect].vessel ||
      !this.aspects[aspect].vessel.class
    ) {
      return null;
    }
    return this.aspects[aspect].vessel;
  };
})();