Registry Pattern Class Loader

jgetner · Oct 2, 2010

Give me Suggestions and opinions.

also a usage example below....

<?php

namespace Loader;

interface iRegistery
{
    public static function Init();

public static function Load($classname);
}

final class Registry implements iRegistery
{
    private static $array=array();

private static $instance;

private static $library;

public static $use;

private function __construct()
{

}

private function __clone()
{

}

final public static function Init()
{
    if(!self::$instance instanceof self)
    {
        self::$instance = new self();
    }

    return self::$instance;
}

public static function RegisterClass($classname , $lib=NULL)
{
    static $path;

    if($lib !== NULL)
    {
        self::$instance->library = $lib;
    }

    elseif($lib === NULL or $lib === 'defualt')
    {
        self::$instance->library = 'library';
    }

    if(\class_exists($classname))
    {
        return self::$instance->array[$classname];
    }

    if(! \class_exists($classname))
    {
        $path = $classname.'.class.php';

        require_once(self::$instance->library .'/' . $path);

        self::$instance->array[$classname]=$path;
    }

    return self::$instance->array[$classname];
}


final public static function Load($classname)
{
    if(isset(self::$instance->array[$classname]))
    {
        self::$instance->use = new $classname;
    }

    elseif(!isset(self::$instance->array[$classname]))
    {
        throw new SystemException('Fatal Error: Class' . $classname . 'doesn\'t Exists Class Must Be A Registered Class' );
    }

    return self::$instance->use;
}
}

namespace Loader;

class SystemException extends \Exception
{

public function __construct($message, $code = 0, \Exception $previous = null) {



    parent::__construct($message, $code, $previous);
}


public function __toString() {
    return __CLASS__ . ": [{$this->code}]: {$this->message}\n";
}
}


?>

Usage Example....

<?php


// using namespace Loader\Registry.
use Loader\Registry;



// getting the registry.
require_once('registry.class.php');



//setting the Registry instance and access varibale to load and set classes.
$System = Registry::Init();



//Setting Class Output into the registry.
//optional Regsitry pram: you can set the directory  as the second value of registerclass.
//$system->RegisterClass('testclass' , 'testdirectory'); 
// this will attempt to load clases out of the new directory.
$System->RegisterClass('output');




// try to load and use class functions.
try
{
    //Load the class output for use.
    $System->Load('output');



//using method Display from out.
$System->use->Display('josh');
}

// catch any systemexceptions
catch(\SystemException $e)
{

echo $e->getMessage().'-'. $e->getLine() .'-'. $e->getCode(); 

}



?>