Shared loader - MY_Loader.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

define('SHAREPATH', 'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs/codeigniter/shared/');

// ------------------------------------------------------------------------

/**
 * Loader Class
 *
 * Loads views and files
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @author		ExpressionEngine Dev Team
 * @category	Loader
 * @link		http://codeigniter.com/user_guide/libraries/loader.html
 */
class MY_Loader extends CI_Loader {

/**
	 * Model Loader
	 *
	 * This function lets users load and instantiate models.
	 *
	 * @access	public
	 * @param	string	the name of the class
	 * @param	string	name for the model
	 * @param	bool	database connection
	 * @return	void
	 */	
	function model($model, $name = '', $db_conn = FALSE)
	{		
		if (is_array($model))
		{
			foreach($model as $babe)
			{
				$this->model($babe);	
			}
			return;
		}

		if ($model == '')
		{
			return;
		}
	
		// Is the model in a sub-folder? If so, parse out the filename and path.
		if (strpos($model, '/') === FALSE)
		{
			$path = '';
		}
		else
		{
			$x = explode('/', $model);
			$model = end($x);			
			unset($x[count($x)-1]);
			$path = implode('/', $x).'/';
		}
	
		if ($name == '')
		{
			$name = $model;
		}
		
		if (in_array($name, $this->_ci_models, TRUE))
		{
			return;
		}
		
		$CI =& get_instance();
		if (isset($CI->$name))
		{
			show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
		}
	
		$model = strtolower($model);
		
		// PJS Shared change
		//if ( ! file_exists(APPPATH.'models/'.$path.$model.EXT))
		$app_model = APPPATH.'models/'.$path.$model.EXT;
		$share_model = SHAREPATH.'models/'.$path.$model.EXT;
			 
		if ( (! $app_model_exists = file_exists($app_model)) &&
			 (! $share_model_exists = file_exists($share_model)) )
		{
			show_error('Unable to locate the model you have specified: '.$model);
		}
		// end PJS Shared change
			
		if ($db_conn !== FALSE AND ! class_exists('CI_DB'))
		{
			if ($db_conn === TRUE)
				$db_conn = '';
		
			$CI->load->database($db_conn, FALSE, TRUE);
		}
	
		if ( ! class_exists('Model'))
		{
			load_class('Model', FALSE);
		}

		// PJS Shared change
		if($app_model_exists)
		{
			require_once($app_model);
		}
		
		else
		{
			require_once($share_model);
		}
		
		//require_once(APPPATH.'models/'.$path.$model.EXT);
		// end PJS Shared change
	
		$model = ucfirst($model);
				
		$CI->$name = new $model();
		$CI->$name->_assign_libraries();
		
		$this->_ci_models[] = $name;	
	}

	/**
	 * Load class
	 *
	 * This function loads the requested class.
	 *
	 * @access	private
	 * @param 	string	the item that is being loaded
	 * @param	mixed	any additional parameters
	 * @param	string	an optional object name
	 * @return 	void
	 */
	function _ci_load_class($class, $params = NULL, $object_name = NULL)
	{	
		// Get the class name, and while we're at it trim any slashes.  
		// The directory path can be included as part of the class name, 
		// but we don't want a leading slash
		$class = str_replace(EXT, '', trim($class, '/'));
	
		// Was the path included with the class name?
		// We look for a slash to determine this
		$subdir = '';
		if (strpos($class, '/') !== FALSE)
		{
			// explode the path so we can separate the filename from the path
			$x = explode('/', $class);	
			
			// Reset the $class variable now that we know the actual filename
			$class = end($x);
			
			// Kill the filename from the array
			unset($x[count($x)-1]);
			
			// Glue the path back together, sans filename
			$subdir = implode($x, '/').'/';
		}

		// We'll test for both lowercase and capitalized versions of the file name
		foreach (array(ucfirst($class), strtolower($class)) as $class)
		{
			$subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.EXT;

			// PJS Shared change
			if( ! file_exists($subclass) )
			{
				$subclass = SHAREPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.EXT;
			}
			// end PJS Shared change

			// Is this a class extension request?			
			if (file_exists($subclass))
			{
				$baseclass = BASEPATH.'libraries/'.ucfirst($class).EXT;
				
				if ( ! file_exists($baseclass))
				{
					log_message('error', "Unable to load the requested class: ".$class);
					show_error("Unable to load the requested class: ".$class);
				}

				// Safety:  Was the class already loaded by a previous call?
				if (in_array($subclass, $this->_ci_loaded_files))
				{
					// Before we deem this to be a duplicate request, let's see
					// if a custom object name is being supplied.  If so, we'll
					// return a new instance of the object
					if ( ! is_null($object_name))
					{
						$CI =& get_instance();
						if ( ! isset($CI->$object_name))
						{
							return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);			
						}
					}
					
					$is_duplicate = TRUE;
					log_message('debug', $class." class already loaded. Second attempt ignored.");
					return;
				}
	
				include_once($baseclass);				
				include_once($subclass);
				$this->_ci_loaded_files[] = $subclass;
	
				return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);			
			}
		
			// Lets search for the requested library file and load it.
			$is_duplicate = FALSE;		
			for ($i = 1; $i <= 3; $i++)
			{
				// PJS Shared change
				switch( $i )
				{
					case 1:
						$path = APPPATH;
					break;
					
					case 2:
						$path = SHAREPATH;
					break;
					
					case 3:
						$path = BASEPATH;
					break;
				}
				
				//$path = ($i % 2) ? APPPATH : BASEPATH;
				// PJS Shared change
				
				$filepath = $path.'libraries/'.$subdir.$class.EXT;
				
				// Does the file exist?  No?  Bummer...
				if ( ! file_exists($filepath))
				{
					continue;
				}
				
				// Safety:  Was the class already loaded by a previous call?
				if (in_array($filepath, $this->_ci_loaded_files))
				{
					// Before we deem this to be a duplicate request, let's see
					// if a custom object name is being supplied.  If so, we'll
					// return a new instance of the object
					if ( ! is_null($object_name))
					{
						$CI =& get_instance();
						if ( ! isset($CI->$object_name))
						{
							return $this->_ci_init_class($class, '', $params, $object_name);
						}
					}
				
					$is_duplicate = TRUE;
					log_message('debug', $class." class already loaded. Second attempt ignored.");
					return;
				}
				
				include_once($filepath);
				$this->_ci_loaded_files[] = $filepath;
				return $this->_ci_init_class($class, '', $params, $object_name);
			}
		} // END FOREACH

		// One last attempt.  Maybe the library is in a subdirectory, but it wasn't specified?
		if ($subdir == '')
		{
			$path = strtolower($class).'/'.$class;
			return $this->_ci_load_class($path, $params);
		}
		
		// If we got this far we were unable to find the requested class.
		// We do not issue errors if the load call failed due to a duplicate request
		if ($is_duplicate == FALSE)
		{
			log_message('error', "Unable to load the requested class: ".$class);
			show_error("Unable to load the requested class: ".$class);
		}
	}
	
	// --------------------------------------------------------------------

}

/* End of file Loader.php */
/* Location: ./system/libraries/Loader.php */

Does this load helpers too?

I wouldn't bother, you can use "Application Packages" in CodeIgniter 2.0 to do this which supports models, libraries, helpers, config, etc.

It's always great when the EllisLab guys make my little hacks obsolete. :-D

Hmmm... not much use to me now. how far off is that do you reckon?