> I have chosen the worst weekend to need a quick answer! Oh
> well, please help
I'm no OO expert, but I'll do what I can.
> my question is, how do i reference the properties of the
> database cfc, and the methods of the dao, from within the
> vehicle cfc it self, and from outside of the cfc from the
> controller
Currently, you can't. All of those instance variables are private (as they
probably should be). You will need to write public methods in each CFC to
allow you to indirectly access those private properties.
> Also, how do i reference the instance scope of the vehicle
> cfc, from within the vehicle dao.
Again, you can't. You can, however, pass them as arguments to the public
methods you'll need to write, as described above.
> Does a composition like this all share the same variables
> (instance) scope?
No, I don't think so. Each will have its own scope.
> I realise that the above method also breaks encapsulation, so
> would i pass in objects to the init method of the vehicle
> cfc. Would this pass a reference to an object outside of
> vehicle cfc or would the whole object be passed into the
> vehicle cfc?
I'm not sure exactly what you're asking here. However, if you pass CFC
instances to a method of another CFC instance, I'm pretty sure they're
passed by reference. That doesn't mean you'll necessarily be able to access
these arguments from outside the CFC instance to which you pass them - you
would have to associate them with a variable first if you want to do so.
<!--- This foo instance can be addressed directly, or within oBar using
whatever argument name it was given. --->
<cfset oFoo = CreateObject("component", "foo")>
<cfset oBar = CreateObject("component", "bar").init(oFoo)>
<!--- This foo instance can only be addressed within oBaz using the argument
name it was given. --->
<cfset oBaz = CreateObject("component",
"baz").init(CreateObject("component", "foo")>
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
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