On Mon, 2003-09-22 at 13:25, jsWalter wrote:
>
> "Raditha Dissanayake" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > hi,
> >
> > It's generaly considered that constructors are supposed return an
> > instance of that class. Use a factory instead if you want to return nulls;
>
>
> A Factory?
>
> OK, I'll look that up, do some readng and try that route.
In brief -- a factory is a function or object that returns instances of
some object for which it is a factory. It is based on the analogy, for
instance, whereby a car factory outputs cars. A logical example of a
factory might be an object that returns user objects. The interface
might be something like follows:
$userFactory = &new UserFactory();
$userObj = &$userFactory->getUser( $userId );
In the above example if the user ID was not valid then $userFactory
might very well return null. A special case of a factory, a singleton
factory, is where the factory ALWAYS returns the same object. Such a
factory might be used for a session object so that there is only ever
one interface object to the session data.
HTH,
Rob.
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