code: private static Map<RouteDefinition, Method> join(Map<RouteDefinition, Method> base, Map<RouteDefinition, Method> add) {
  
  		for (RouteDefinition definition : base.keySet()) {
  			Method method = base.get(definition);
  
  			RouteDefinition additional = find(add, method);
  			definition.join(additional);
  		}
  
  		return base;
  	}
docs: Joins additional data provided in subclass/ interfaces with base definition
  
  @param base base definition
  @param add  additional definition
  @return joined definition