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Re: Calling child class from parent class

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daveh@allheller.net wrote:

> Is this possible?
> 
> […]
> class GNP_DIRECTORY
> {
>     public $m_rules;    
>     public $m_names;    //array of GTCM_GNP object names
>     public $m_cnt;
>  […]
>     public function register($name, $rule, $dat_file, $server, $port)
>     {
>                 if(in_array($name, $this->m_names))
>                 {
>                         $this->m_rules[$name][] = $rule;
>                         return $this->m_names[$name];
>                 }
>                 $$name = new GTCM_GNP($this);
>                 if(!$$name)
>                   {
>                   return FALSE;
>                   }
>                 $this->m_cnt++;
>                 $this->m_names[] = $name;
>                 $this->m_rules[$name] = array($rule);
>                 return $$name;
>         }
> }
> 
> class GTCM_GNP extends GNP_DIRECTORY
> {
>   […]
>     public function do_something
>     {
>       return $this->variable;
>     }
> }
> Basically I need to do: GNP_DIRECTORY[$$names]->do_something();
> 
> or I want to do some method in GTCM_GNP by referring to a specific
> GNP_DIRECTORY
> 
> Will this (pseudo)code work or is there a better approach.

Try to post a *reduced* *working* example next time.

So, first of all, why do you not try and see?

IIUC, in GNP_DIRECTORY::register() you want to append a new GTCM_GNP 
instance to an array property of an GNP_DIRECTORY instance, and let it know 
about the GNP_DIRECTORY instance it is related to:

  public function register($name, $rule, $dat_file, $server, $port)
  {
    …
    $item = new GTCM_GNP($this);
    …
    $this->m_items[$name] = $item;
    …
  }

Then you can of course call methods of the GTCM_GNP instance by using its 
assigned name ($name) as index:

  $dir = new GNP_DIRECTORY();
  $dir->register($name, …);
  $dir->m_items[$name]->do_something();

I would strongly suggest that the properties be “private” or “protected”, 
though, and access to them be only possible through a getter, and if not 
read-only, a setter.

I would also suggest renaming the classes if possible; only constants should 
have identifiers that are all-uppercase.  Use “GNP_Directory”, for example.  
And, if possible, avoid cryptic class identifiers like “GTCM_GNP”; source 
code should ideally be self-explanatory.

If you are looking for something else:
<http://www.catb.org/~esr/faqs/smart-questions.html#beprecise>.

And get a real name, please.


PointedEars
-- 
Prototype.js was written by people who don't know javascript for people
who don't know javascript. People who don't know javascript are not
the best source of advice on designing systems that use javascript.
  -- Richard Cornford, cljs, <f806at$ail$1$8300dec7@news.demon.co.uk>

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Calling child class from parent class daveh@allheller.net - 2013-04-11 12:48 -0700
  Re: Calling child class from parent class Salvatore <sal@yojimbo.hack.invalid> - 2013-04-11 20:40 +0000
  Re: Calling child class from parent class Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 23:15 +0200
  Re: Calling child class from parent class daveh@allheller.net - 2013-04-11 17:11 -0700
    Re: Calling child class from parent class Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-12 11:58 +0200
  Re: Calling child class from parent class Jerry Stuckle <jstucklex@attglobal.net> - 2013-04-11 22:49 -0400

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