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<?php defined('SYSPATH') or die('No direct script access.');
/**
* Loader.
*
* $Id: Loader.php 1758 2008-01-21 00:05:34Z PugFish $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Loader {

/**
* Autoloads libraries and models specified in config file.
*/
public function __construct()
{
foreach(array (Config::get('preload')) as $type => $load)
{
if ($load == FALSE) continue;

foreach(explode(',', $load) as $name)
{
if (($name = trim($name)) == FALSE) continue;

switch($type)
{
case 'libraries':
if ($name == 'database')
{
$this->database();
}
else
{
$this->library($name);
}
break;
case 'models':
$this->model($name);
break;
}
}
}
}

/**
* Load library.
*
* @param string library name
* @param array custom configuration
* @param boolean return library instance instead of adding to Kohana instance
* @return FALSE|Object FALSE if library is already loaded, instance of library if return is TRUE
*/
public function library($name, $config = array(), $return = FALSE)
{
if (isset(Kohana::instance()->$name) AND $return == FALSE)
return FALSE;

if ($name == 'database')
{
return $this->database($config, $return);
}
else
{
$class = ucfirst($name);
$class = new $class($config);

if ($return == TRUE)
return $class;

Kohana::instance()->$name = $class;
}
}

/**
* Load database.
*
* @param string Database config group to use
* @param boolean return database instance instead of adding to Kohana instance
* @return void|Database database instance if return is TRUE
*/
public function database($group = 'default', $return = FALSE)
{
$db = new Database($group);

// Return the new database object
if ($return == TRUE)
return $db;

Kohana::instance()->db = $db;
}

/**
* Load helper. Deprecated.
*
* @param string helper name
*/
public function helper($name)
{
// Just don't do this... there's no point.
Log::add('debug', 'Using $this->load->helper() is deprecated. See Kohana::auto_load().');
}

/**
* Load model.
*
* @param string model name
* @param string custom name for accessing model, or TRUE to return instance of model
* @return void|FALSE|Object FALSE if model is already loaded, instance of model if alias is TRUE
*/
public function model($name, $alias = FALSE)
{
// The alias is used for Controller->alias
$alias = ($alias == FALSE) ? $name : $alias;
$class = ucfirst($name).'_Model';

if (isset(Kohana::instance()->$alias))
return FALSE;

if (strpos($name, '/') !== FALSE)
{
// Handle models in subdirectories
require_once Kohana::find_file('models', $name);

// Reset the class name
$class = end(explode('/', $class));
}

// Load the model
$model = new $class();

// Return the model
if ($alias === TRUE)
return $model;

Kohana::instance()->$alias = $model;
}

/**
* Load view.
*
* @param string view name
* @param array data to make accessible within view
* @return View
*/
public function view($name, $data = array())
{
return new View($name, $data);
}

} // End Loader Class
(9-9/22)