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Diffstat (limited to 'system/libraries/Driver.php')
| -rw-r--r-- | system/libraries/Driver.php | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/system/libraries/Driver.php b/system/libraries/Driver.php new file mode 100644 index 000000000..07ef2e724 --- /dev/null +++ b/system/libraries/Driver.php @@ -0,0 +1,232 @@ +<?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 EllisLab Dev Team + * @copyright Copyright (c) 2006 - 2010, 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 static $lib_name; + + // The first time a child is used it won't exist, so we instantiate it + // subsequents calls will go straight to the proper child. + function __get($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; + + if (in_array(strtolower($child_class), 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 (array(APPPATH, BASEPATH) as $path) + { + // and check for case sensitivity of both the parent and child libs + foreach (array(ucfirst($this->lib_name), strtolower($this->lib_name)) as $lib) + { + // loves me some nesting! + foreach (array(ucfirst($child_class), strtolower($child_class)) as $class) + { + $filepath = $path.'libraries/'.$this->lib_name.'/drivers/'.$child_class.EXT; + + if (file_exists($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 $reflections = array(); + + /** + * Decorate + * + * Decorates the child with the parent driver lib's methods and properties + * + * @access public + * @param object + * @return void + */ + function decorate($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'], $trace[1]['line']); + exit; + } + + // -------------------------------------------------------------------- + + /** + * __get magic method + * + * Handles reading of the parent driver library's properties + * + * @access public + * @param string + * @return mixed + */ + function __get($var) + { + if (in_array($var, $this->properties)) + { + return $this->parent->$var; + } + } + + // -------------------------------------------------------------------- + + /** + * __set magic method + * + * Handles writing to the parent driver library's properties + * + * @access public + * @param string + * @param array + * @return mixed + */ + 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 */
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