source: Dev/branches/cakephp/cake/libs/object.php @ 143

<?php
/**
 * Object class, allowing __construct and __destruct in PHP4.
 *
 * Also includes methods for logging and the special method RequestAction,
 * to call other Controllers' Actions from anywhere.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP(tm) v 0.2.9
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

/**
 * Object class, allowing __construct and __destruct in PHP4.
 *
 * Also includes methods for logging and the special method RequestAction,
 * to call other Controllers' Actions from anywhere.
 *
 * @package cake
 * @subpackage cake.cake.libs
 */
class Object {

/**
 * A hack to support __construct() on PHP 4
 * Hint: descendant classes have no PHP4 class_name() constructors,
 * so this constructor gets called first and calls the top-layer __construct()
 * which (if present) should call parent::__construct()
 *
 * @return Object
 */
        function Object() {
                $args = func_get_args();
                if (method_exists($this, '__destruct')) {
                        register_shutdown_function (array(&$this, '__destruct'));
                }
                call_user_func_array(array(&$this, '__construct'), $args);
        }

/**
 * Class constructor, overridden in descendant classes.
 */
        function __construct() {
        }

/**
 * Object-to-string conversion.
 * Each class can override this method as necessary.
 *
 * @return string The name of this class
 * @access public
 */
        function toString() {
                $class = get_class($this);
                return $class;
        }

/**
 * Calls a controller's method from any location. Can be used to connect controllers together
 * or tie plugins into a main application. requestAction can be used to return rendered views
 * or fetch the return value from controller actions.
 *
 * @param mixed $url String or array-based url.
 * @param array $extra if array includes the key "return" it sets the AutoRender to true.
 * @return mixed Boolean true or false on success/failure, or contents
 *    of rendered action if 'return' is set in $extra.
 * @access public
 */
        function requestAction($url, $extra = array()) {
                if (empty($url)) {
                        return false;
                }
                if (!class_exists('dispatcher')) {
                        require CAKE . 'dispatcher.php';
                }
                if (in_array('return', $extra, true)) {
                        $extra = array_merge($extra, array('return' => 0, 'autoRender' => 1));
                }
                if (is_array($url) && !isset($extra['url'])) {
                        $extra['url'] = array();
                }
                $params = array_merge(array('autoRender' => 0, 'return' => 1, 'bare' => 1, 'requested' => 1), $extra);
                $dispatcher = new Dispatcher;
                return $dispatcher->dispatch($url, $params);
        }

/**
 * Calls a method on this object with the given parameters. Provides an OO wrapper
 * for `call_user_func_array`
 *
 * @param string $method  Name of the method to call
 * @param array $params  Parameter list to use when calling $method
 * @return mixed  Returns the result of the method call
 * @access public
 */
        function dispatchMethod($method, $params = array()) {
                switch (count($params)) {
                        case 0:
                                return $this->{$method}();
                        case 1:
                                return $this->{$method}($params[0]);
                        case 2:
                                return $this->{$method}($params[0], $params[1]);
                        case 3:
                                return $this->{$method}($params[0], $params[1], $params[2]);
                        case 4:
                                return $this->{$method}($params[0], $params[1], $params[2], $params[3]);
                        case 5:
                                return $this->{$method}($params[0], $params[1], $params[2], $params[3], $params[4]);
                        default:
                                return call_user_func_array(array(&$this, $method), $params);
                        break;
                }
        }

/**
 * Stop execution of the current script.  Wraps exit() making 
 * testing easier.
 *
 * @param $status see http://php.net/exit for values
 * @return void
 * @access public
 */
        function _stop($status = 0) {
                exit($status);
        }

/**
 * Convience method to write a message to CakeLog.  See CakeLog::write()
 * for more information on writing to logs.
 *
 * @param string $msg Log message
 * @param integer $type Error type constant. Defined in app/config/core.php.
 * @return boolean Success of log write
 * @access public
 */
        function log($msg, $type = LOG_ERROR) {
                if (!class_exists('CakeLog')) {
                        require LIBS . 'cake_log.php';
                }
                if (!is_string($msg)) {
                        $msg = print_r($msg, true);
                }
                return CakeLog::write($type, $msg);
        }

/**
 * Allows setting of multiple properties of the object in a single line of code.  Will only set 
 * properties that are part of a class declaration.
 *
 * @param array $properties An associative array containing properties and corresponding values.
 * @return void
 * @access protected
 */
        function _set($properties = array()) {
                if (is_array($properties) && !empty($properties)) {
                        $vars = get_object_vars($this);
                        foreach ($properties as $key => $val) {
                                if (array_key_exists($key, $vars)) {
                                        $this->{$key} = $val;
                                }
                        }
                }
        }

/**
 * Used to report user friendly errors.
 * If there is a file app/error.php or app/app_error.php this file will be loaded
 * error.php is the AppError class it should extend ErrorHandler class.
 *
 * @param string $method Method to be called in the error class (AppError or ErrorHandler classes)
 * @param array $messages Message that is to be displayed by the error class
 * @return error message
 * @access public
 */
        function cakeError($method, $messages = array()) {
                if (!class_exists('ErrorHandler')) {
                        App::import('Core', 'Error');

                        if (file_exists(APP . 'error.php')) {
                                include_once (APP . 'error.php');
                        } elseif (file_exists(APP . 'app_error.php')) {
                                include_once (APP . 'app_error.php');
                        }
                }

                if (class_exists('AppError')) {
                        $error = new AppError($method, $messages);
                } else {
                        $error = new ErrorHandler($method, $messages);
                }
                return $error;
        }

/**
 * Checks for a persistent class file, if found file is opened and true returned
 * If file is not found a file is created and false returned
 * If used in other locations of the model you should choose a unique name for the persistent file
 * There are many uses for this method, see manual for examples
 *
 * @param string $name name of the class to persist
 * @param string $object the object to persist
 * @return boolean Success
 * @access protected
 * @todo add examples to manual
 */
        function _persist($name, $return = null, &$object, $type = null) {
                $file = CACHE . 'persistent' . DS . strtolower($name) . '.php';
                if ($return === null) {
                        if (!file_exists($file)) {
                                return false;
                        } else {
                                return true;
                        }
                }

                if (!file_exists($file)) {
                        $this->_savePersistent($name, $object);
                        return false;
                } else {
                        $this->__openPersistent($name, $type);
                        return true;
                }
        }

/**
 * You should choose a unique name for the persistent file
 *
 * There are many uses for this method, see manual for examples
 *
 * @param string $name name used for object to cache
 * @param object $object the object to persist
 * @return boolean true on save, throws error if file can not be created
 * @access protected
 */
        function _savePersistent($name, &$object) {
                $file = 'persistent' . DS . strtolower($name) . '.php';
                $objectArray = array(&$object);
                $data = str_replace('\\', '\\\\', serialize($objectArray));
                $data = '<?php $' . $name . ' = \'' . str_replace('\'', '\\\'', $data) . '\' ?>';
                $duration = '+999 days';
                if (Configure::read() >= 1) {
                        $duration = '+10 seconds';
                }
                cache($file, $data, $duration);
        }

/**
 * Open the persistent class file for reading
 * Used by Object::_persist()
 *
 * @param string $name Name of persisted class
 * @param string $type Type of persistance (e.g: registry)
 * @return void
 * @access private
 */
        function __openPersistent($name, $type = null) {
                $file = CACHE . 'persistent' . DS . strtolower($name) . '.php';
                include($file);

                switch ($type) {
                        case 'registry':
                                $vars = unserialize(${$name});
                                foreach ($vars['0'] as $key => $value) {
                                        if (strpos($key, '_behavior') !== false) {
                                                App::import('Behavior', Inflector::classify(substr($key, 0, -9)));
                                        } else {
                                                App::import('Model', Inflector::camelize($key));
                                        }
                                        unset ($value);
                                }
                                unset($vars);
                                $vars = unserialize(${$name});
                                foreach ($vars['0'] as $key => $value) {
                                        ClassRegistry::addObject($key, $value);
                                        unset ($value);
                                }
                                unset($vars);
                        break;
                        default:
                                $vars = unserialize(${$name});
                                $this->{$name} = $vars['0'];
                                unset($vars);
                        break;
                }
        }
}