[Moo] How to code entity classes

[Blackbird]

Hello,

I don't really know the best way to code entity classes in Mootools.


Let's consider the following entities:

- Activity:
Contains the following properties:
        ¤ startDate (of type date)
        ¤ endDate (of type date)
        ¤ station (of type Station entity)
        ¤ vehicles (list of Vehicle entities)

- Station
        ¤ code (string)
        ¤ name (string)

- Vehicle
        ¤ id (string)


I need:

a) To be able to set properties at instantiation, .NET style. For
example:
########
var break = new Activity ({
        "startDate": Date.parse("2011-4-12 21:45:00"),
        "endDate": Date.parse("2011-4-12 22:00:00"),
        "station": Stations.stockholm,
        "vehicles": [ Vehicles.v2110, Vehicles.v2111 ]
});
########

b) To easily encode this Activity object (+ children) in JSON, which
would result in:
########
{
    "startDate": "2011-4-12 21:45:00",
        "endDate": "2011-4-12 22:00:00",
        "station": {
            "code": "CST",
            "name": "Stockholm C"
        },
        "vehicles": [ {
                "id": "v2110"
        }, {
                "id": "v2111"
        }
        ]
}
########

c) To have a clean "public" interface to get and set an object's
properties, hiding the underlying implementation. For example:
########
"var breakStartDate = break.startDate" + "break.startDate = newDate"

"var breakStartDate = break.getStartDate()" +
"break.setStartDate(newDate)"
########


I'm sure many of you have faced this problem. How do you handle it?