/**
 * Add an entry to the hierarchy. It takes care of updating meta also.
 *
 * @method addToHierarchy
 * @static
 * @param {Object} hierarchy
 * @param {String} type
 * @param {Class} classObj
 * @param {Number} level
 */
export default function addToHierarchy(hierarchy, type, classObj, level) {
  var meta = hierarchy.hierarchyMeta;
  hierarchy[level].classes[type] = classObj;
  meta[type] = {
    level : level,
  };
}