> Instead of asking the car what type of car it is, why don't you just
>ask it whether it can tow boats?
>
><cfif myCar.canTowBoats()>
The only problem with this is flexibility. For each role that you then want
your vehicles to maintain, you have to add a property.
As far as runtime determination of class name - that's easy! No need to
store it anywhere:
<cfif GetMetaData(myVehicle).Name is "com.truck">
Tow my boat!
</cfif>
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Patrick McElhaney
Sent: Wednesday, April 06, 2005 3:29 PM
To: [email protected]
Subject: Re: [CFCDev] Question on class / subclass
On Apr 6, 2005 12:32 PM, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
>
> <cfset myCar = createObject("component","com.car").init()>
> <cfset carDAO.read(myCar,form.vin_number)>
> <cfif myCar.getType() is "truck">
> <cfset myCar.towBoat()>
> <cfelse>
> Sorry, you can't tow a boat with your car
> </cfif>
Instead of asking the car what type of car it is, why don't you just
ask it whether it can tow boats?
<cfif myCar.canTowBoats()>
You can have your SUV and Truck CFCs always return true, and your
SportsCar CFC always return false. Later, if you add a Motorcycle CFC
and a Sedan CFC you don't need to change the code that works with
cars.
The code above could be rewritten like so.
<cfset carDAO.read(myCar,form.vin_number)>
<cfif myCar.canTowBoats()>
<cfset myCar.towBoat()>
<cfelse>
Sorry, you can't tow a boat with your car
</cfif>
Patrick
--
Patrick McElhaney
704.560.9117
http://pmcelhaney.weblogs.us
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