Here's one example:
<cfcomponet hint="Car">
<cfset variables.engine = CreateObject('component', 'Engine') />
<cffunction name="getEngine" returntype="Engine">
<cfreturn variables.engine />
</cffunction>
</cfcomponent>
The Car "has a" Engine component.
Hal Helms
See halhelms.com for classes in...
Java for ColdFusion Programmers
Fusebox 4
Mach-II
OO Applications with CFCs
-----Original Message-----
From: Ian Skinner [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 04, 2003 1:39 PM
To: CF-Talk
Subject: RE: CFC/Object Best Practice
Thanks, I've got a pretty good handle on inheritance (a Porsche IS A
car) ... using cfcomponent extends. What I'm looking for is how one
might code other types of relationships such as (a car HAS A engine).
What might the cfc code look like to accomplish this?
Thanks for the link, looks like a good one, I'm going to read through it
now.
--------------
Ian Skinner
Web Programmer
BloodSource
Sacramento, CA
-----Original Message-----
From: Joe Eugene [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 04, 2003 9:17 AM
To: CF-Talk
Subject: Re: CFC/Object Best Practice
> And how would this look in the code of a CFC?
<cfcomponent extends="MyParentComponent">
You use the the "extends" to Inherit Instance variables from your parent
CFC to Your Sub CFC.
Your might want to read
http://livedocs.macromedia.com/coldfusion/6.1/htmldocs/buildi52.htm
> (designing them is another story).
To Design Blue Prints for Objects Or Classes (OOD), you need to have a
good understanding of your application model.
Joe Eugene
----- Original Message -----
From: "Ian Skinner" <[EMAIL PROTECTED]>
To: "CF-Talk" <[EMAIL PROTECTED]>
Sent: Thursday, September 04, 2003 11:14 AM
Subject: RE: CFC/Object Best Practice
> >> practice to code this relationship in an CFC. How would the car
> >> code
> send
> >> and receive messages to the engine code?
>
> >Objects talk to each other by invoking their instance methods.
>
> And how would this look in the code of a CFC?
>
> >I think you might be trying real hard to apply inheritance above (Car
> >- Engine), to me this is more of abstraction - divide and conquer...
> >not really inheritance.
>
> Exactly, I have a pretty good idea of how to code and use inheritance
> (designing them is another story). My example was supposed to be an
example
> of relationship that WAS NOT inheritance, and how would one code cfc's
> for this relationship?
>
> --------------
> Ian Skinner
> Web Programmer
> BloodSource
> Sacramento, CA
>
>
> -----Original Message-----
> From: Joe Eugene [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 04, 2003 8:01 AM
> To: CF-Talk
> Subject: Re: CFC/Object Best Practice
>
>
> > practice to code this relationship in an CFC. How would the car
> > code
send
> > and receive messages to the engine code?
>
> Objects talk to each other by invoking their instance methods.
>
> > themselves). Anyway, using the ever present car object example.
> > You
have
> a
> > car class/object that contains an engine class/object
>
> I think you might be trying real hard to apply inheritance above(Car -
> Engine), to me this is more of abstraction - divide and conquer... not
> really inheritance.
>
> An example of Inheritance would be some like
>
> Dog
> - Hunting dog
> - Pet dog
>
> Both Hunting dog and Pet dog inherit the properties of DOG...(ie all
> Dogs have 4 legs, 2 eyes, nose etc) while Hunting dog itself has the
> extensive properties/features of a
Hunting
> Dog(vigilant ...)
>
> Joe Eugene
>
> ----- Original Message -----
> From: "Ian Skinner" <[EMAIL PROTECTED]>
> To: "CF-Talk" <[EMAIL PROTECTED]>
> Sent: Thursday, September 04, 2003 10:42 AM
> Subject: CFC/Object Best Practice
>
>
> > Ok, I think I have a pretty good handle on how to code inheritance
> > with CFC's, but I'm not so sure how you do aggregation and/or
> > composition
> (still
> > learning the concepts of Object orientated programming as well as
> > cfc's themselves). Anyway, using the ever present car object
> > example. You
have
> a
> > car class/object that contains an engine class/object. What is the
> > best practice to code this relationship in an CFC. How would the
> > car code
send
> > and receive messages to the engine code?
> >
> > Thanks
> >
> > --------------
> > Ian Skinner
> > Web Programmer
> > BloodSource
> > Sacramento, CA
> >
> >
>
>
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