Convert "closed" polyline to polygon with JS API 3.2

[JorgeVinagre]

Hi
I have this scenario(requirements):

1. In a web app that uses JS API (3.2) there are two layers, one of the polyline type and other a polygon type.


2. Users should be able to select a geometry from the polyline layer and "insert it" into the polygon layer.


3. The application should should validate if the selected polyline is "closed", convert it to a polygon and persist it into the polygon layer

Any directions on this?
I dont know which part of the api can do this

Thanks