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system/libraries/Driver.php

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+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2006 - 2012, EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @link		http://codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * CodeIgniter Driver Library Class
+ *
+ * This class enables you to create "Driver" libraries that add runtime ability
+ * to extend the capabilities of a class via additional driver objects
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Libraries
+ * @author		EllisLab Dev Team
+ * @link
+ */
+class CI_Driver_Library {
+
+	protected $valid_drivers	= array();
+	protected $lib_name;
+
+	// The first time a child is used it won't exist, so we instantiate it
+	// subsequents calls will go straight to the proper child.
+	function __get($child)
+	{
+		if ( ! isset($this->lib_name))
+		{
+			$this->lib_name = get_class($this);
+		}
+
+		// The class will be prefixed with the parent lib
+		$child_class = $this->lib_name.'_'.$child;
+	
+		// Remove the CI_ prefix and lowercase
+		$lib_name = ucfirst(strtolower(str_replace('CI_', '', $this->lib_name)));
+		$driver_name = strtolower(str_replace('CI_', '', $child_class));
+		
+		if (in_array($driver_name, array_map('strtolower', $this->valid_drivers)))
+		{
+			// check and see if the driver is in a separate file
+			if ( ! class_exists($child_class))
+			{
+				// check application path first
+				foreach (get_instance()->load->get_package_paths(TRUE) as $path)
+				{
+					// loves me some nesting!
+					foreach (array(ucfirst($driver_name), $driver_name) as $class)
+					{
+						$filepath = $path.'libraries/'.$lib_name.'/drivers/'.$class.'.php';
+
+						if (file_exists($filepath))
+						{
+							include_once $filepath;
+							break;
+						}
+					}
+				}
+
+				// it's a valid driver, but the file simply can't be found
+				if ( ! class_exists($child_class))
+				{
+					log_message('error', "Unable to load the requested driver: ".$child_class);
+					show_error("Unable to load the requested driver: ".$child_class);
+				}
+			}
+
+			$obj = new $child_class;
+			$obj->decorate($this);
+			$this->$child = $obj;
+			return $this->$child;
+		}
+
+		// The requested driver isn't valid!
+		log_message('error', "Invalid driver requested: ".$child_class);
+		show_error("Invalid driver requested: ".$child_class);
+	}
+
+	// --------------------------------------------------------------------
+
+}
+// END CI_Driver_Library CLASS
+
+
+/**
+ * CodeIgniter Driver Class
+ *
+ * This class enables you to create drivers for a Library based on the Driver Library.
+ * It handles the drivers' access to the parent library
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Libraries
+ * @author		EllisLab Dev Team
+ * @link
+ */
+class CI_Driver {
+	protected $parent;
+
+	private $methods = array();
+	private $properties = array();
+
+	private static $reflections = array();
+
+	/**
+	 * Decorate
+	 *
+	 * Decorates the child with the parent driver lib's methods and properties
+	 *
+	 * @param	object
+	 * @return	void
+	 */
+	public function decorate($parent)
+	{
+		$this->parent = $parent;
+
+		// Lock down attributes to what is defined in the class
+		// and speed up references in magic methods
+
+		$class_name = get_class($parent);
+
+		if ( ! isset(self::$reflections[$class_name]))
+		{
+			$r = new ReflectionObject($parent);
+
+			foreach ($r->getMethods() as $method)
+			{
+				if ($method->isPublic())
+				{
+					$this->methods[] = $method->getName();
+				}
+			}
+
+			foreach ($r->getProperties() as $prop)
+			{
+				if ($prop->isPublic())
+				{
+					$this->properties[] = $prop->getName();
+				}
+			}
+
+			self::$reflections[$class_name] = array($this->methods, $this->properties);
+		}
+		else
+		{
+			list($this->methods, $this->properties) = self::$reflections[$class_name];
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * __call magic method
+	 *
+	 * Handles access to the parent driver library's methods
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	array
+	 * @return	mixed
+	 */
+	public function __call($method, $args = array())
+	{
+		if (in_array($method, $this->methods))
+		{
+			return call_user_func_array(array($this->parent, $method), $args);
+		}
+
+		$trace = debug_backtrace();
+		_exception_handler(E_ERROR, "No such method '{$method}'", $trace[1]['file'], $trace[1]['line']);
+		exit;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * __get magic method
+	 *
+	 * Handles reading of the parent driver library's properties
+	 *
+	 * @param	string
+	 * @return	mixed
+	 */
+	public function __get($var)
+	{
+		if (in_array($var, $this->properties))
+		{
+			return $this->parent->$var;
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * __set magic method
+	 *
+	 * Handles writing to the parent driver library's properties
+	 *
+	 * @param	string
+	 * @param	array
+	 * @return	mixed
+	 */
+	public function __set($var, $val)
+	{
+		if (in_array($var, $this->properties))
+		{
+			$this->parent->$var = $val;
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+}
+// END CI_Driver CLASS
+
+/* End of file Driver.php */
+/* Location: ./system/libraries/Driver.php */