Re: [CFCDev] Optional Instances of Components

[Matt Liotta]

The proper OO way of handling this IMHO would be to create a Dog 
interface that defines methods common to all Dogs. You could then 
create a Corgi class that implements the Dog interface. Any Dog that 
has a tail method would be considered implementation specific as a tail 
is not defined by the interface.

Now then, since you can't use interfaces in CFMX, then you would 
probably want to use inheritance instead. In that case, you would 
create a Dog CFC and then extend it with a Corgi CFC with any specifics 
to a Welsh Corgi in the Corgi class.

-Matt

On Thursday, September 25, 2003, at 11:45 AM, Justin Balog wrote:

Howdy,

I am just curious how you might handle optional instances vars in
components.  Lets say I have a dog cfc.  It always has a weight, but 
as my
dog (a welsh corgi) can attest he has no tail.  Therefore, a dog may 
or may
not have a tail.  Does that mean that I just have an empty instance 
var?
Here is how I would currently write it. Then if the arguments were
available, I would use the setters individually?  Is there a better 
way to
do it?  Thanks much!  ----Sorry for the short hand bellow.

<cfcomponent>
        <cfset variables.weight = "" />
        <cfset variables.tail = "" />
        <cffunction init>
                <cfargument name="weight"/>
                <cfset setWeight(arguments.weight) />
        </cffunction>
        <cffunction setWeight>
        </cffunction>
        <cffunction getWeight>
        </cffuction>
        <cffuction setTail>
        </cffuction>
        <cffuction getTail>
        </cffuction>
</cfcomponet>

Justin

P.S. Just in case you were wondering what a tail less dog looks like, 
here
you go!  THEDUKE! (Just so everyone knows, I did not cut his tail 
off.....he
came form the rescue that way.)

http://www.hossedia.com/desktops/duke_1024.jpg
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Matt Liotta
President & CEO
Montara Software, Inc.
http://www.MontaraSoftware.com
(888) 408-0900 x901
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