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2005 Aurelien 1 
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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 * CodeIgniter
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 *
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 * An open source application development framework for PHP 4.3.2 or newer
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 *
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 * @package		CodeIgniter
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 * @author		ExpressionEngine Dev Team
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 * @copyright	Copyright (c) 2008, EllisLab, Inc.
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 * @license		http://codeigniter.com/user_guide/license.html
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 * @link		http://codeigniter.com
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 * @since		Version 1.0
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 * @filesource
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 */
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// ------------------------------------------------------------------------
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/**
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 * CodeIgniter Hooks Class
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 *
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 * Provides a mechanism to extend the base system without hacking.  Most of
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 * this class is borrowed from Paul's Extension class in ExpressionEngine.
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 *
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 * @package		CodeIgniter
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 * @subpackage	Libraries
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 * @category	Libraries
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 * @author		ExpressionEngine Dev Team
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 * @link		http://codeigniter.com/user_guide/libraries/encryption.html
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 */
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class CI_Hooks {
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	var $enabled 		= FALSE;
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	var $hooks   		= array();
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	var $in_progress	= FALSE;
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	/**
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	 * Constructor
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	 *
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	 */
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	function CI_Hooks()
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	{
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		$this->_initialize();
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		log_message('debug', "Hooks Class Initialized");
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	}
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	// --------------------------------------------------------------------
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	/**
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	 * Initialize the Hooks Preferences
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	 *
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	 * @access	private
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	 * @return	void
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	 */
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  	function _initialize()
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  	{
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		$CFG =& load_class('Config');
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		// If hooks are not enabled in the config file
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		// there is nothing else to do
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		if ($CFG->item('enable_hooks') == FALSE)
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		{
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			return;
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		}
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		// Grab the "hooks" definition file.
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		// If there are no hooks, we're done.
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		@include(APPPATH.'config/hooks'.EXT);
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		if ( ! isset($hook) OR ! is_array($hook))
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		{
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			return;
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		}
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		$this->hooks =& $hook;
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		$this->enabled = TRUE;
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  	}
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	// --------------------------------------------------------------------
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	/**
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	 * Call Hook
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	 *
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	 * Calls a particular hook
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	 *
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	 * @access	private
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	 * @param	string	the hook name
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	 * @return	mixed
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	 */
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	function _call_hook($which = '')
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	{
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		if ( ! $this->enabled OR ! isset($this->hooks[$which]))
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		{
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			return FALSE;
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		}
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		if (isset($this->hooks[$which][0]) AND is_array($this->hooks[$which][0]))
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		{
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			foreach ($this->hooks[$which] as $val)
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			{
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				$this->_run_hook($val);
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			}
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		}
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		else
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		{
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			$this->_run_hook($this->hooks[$which]);
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		}
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		return TRUE;
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	}
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	// --------------------------------------------------------------------
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	/**
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	 * Run Hook
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	 *
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	 * Runs a particular hook
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	 *
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	 * @access	private
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	 * @param	array	the hook details
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	 * @return	bool
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	 */
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	function _run_hook($data)
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	{
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		if ( ! is_array($data))
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		{
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			return FALSE;
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		}
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		// -----------------------------------
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		// Safety - Prevents run-away loops
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		// -----------------------------------
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		// If the script being called happens to have the same
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		// hook call within it a loop can happen
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		if ($this->in_progress == TRUE)
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		{
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			return;
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		}
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		// -----------------------------------
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		// Set file path
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		// -----------------------------------
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		if ( ! isset($data['filepath']) OR ! isset($data['filename']))
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		{
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			return FALSE;
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		}
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		$filepath = APPPATH.$data['filepath'].'/'.$data['filename'];
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		if ( ! file_exists($filepath))
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		{
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			return FALSE;
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		}
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		// -----------------------------------
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		// Set class/function name
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		// -----------------------------------
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		$class		= FALSE;
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		$function	= FALSE;
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		$params		= '';
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		if (isset($data['class']) AND $data['class'] != '')
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		{
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			$class = $data['class'];
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		}
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		if (isset($data['function']))
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		{
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			$function = $data['function'];
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		}
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		if (isset($data['params']))
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		{
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			$params = $data['params'];
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		}
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		if ($class === FALSE AND $function === FALSE)
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		{
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			return FALSE;
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		}
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		// -----------------------------------
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		// Set the in_progress flag
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		// -----------------------------------
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		$this->in_progress = TRUE;
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		// -----------------------------------
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		// Call the requested class and/or function
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		// -----------------------------------
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		if ($class !== FALSE)
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		{
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			if ( ! class_exists($class))
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			{
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				require($filepath);
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			}
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			$HOOK = new $class;
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			$HOOK->$function($params);
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		}
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		else
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		{
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			if ( ! function_exists($function))
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			{
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				require($filepath);
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			}
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			$function($params);
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		}
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		$this->in_progress = FALSE;
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		return TRUE;
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	}
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}
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// END CI_Hooks class
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/* End of file Hooks.php */
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/* Location: ./system/libraries/Hooks.php */