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  1: <?php
  2: /**
  3:  *
  4:  * PHP 5
  5:  *
  6:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  7:  * Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
  8:  *
  9:  * Licensed under The MIT License
 10:  * Redistributions of files must retain the above copyright notice.
 11:  *
 12:  * @copyright     Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
 13:  * @link          http://cakephp.org CakePHP(tm) Project
 14:  * @package       Cake.Controller
 15:  * @since         CakePHP(tm) v 1.2
 16:  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 17:  */
 18: App::uses('ComponentCollection', 'Controller');
 19: 
 20: /**
 21:  * Base class for an individual Component.  Components provide reusable bits of
 22:  * controller logic that can be composed into a controller.  Components also
 23:  * provide request life-cycle callbacks for injecting logic at specific points.
 24:  *
 25:  * ## Life cycle callbacks
 26:  *
 27:  * Components can provide several callbacks that are fired at various stages of the request
 28:  * cycle.  The available callbacks are:
 29:  *
 30:  * - `initialize()` - Fired before the controller's beforeFilter method.
 31:  * - `startup()` - Fired after the controller's beforeFilter method.
 32:  * - `beforeRender()` - Fired before the view + layout are rendered.
 33:  * - `shutdown()` - Fired after the action is complete and the view has been rendered
 34:  *    but before Controller::afterFilter().
 35:  * - `beforeRedirect()` - Fired before a redirect() is done.
 36:  *
 37:  * @package       Cake.Controller
 38:  * @link          http://book.cakephp.org/2.0/en/controllers/components.html
 39:  * @see Controller::$components
 40:  */
 41: class Component extends Object {
 42: 
 43: /**
 44:  * Component collection class used to lazy load components.
 45:  *
 46:  * @var ComponentCollection
 47:  */
 48:     protected $_Collection;
 49: 
 50: /**
 51:  * Settings for this Component
 52:  *
 53:  * @var array
 54:  */
 55:     public $settings = array();
 56: 
 57: /**
 58:  * Other Components this component uses.
 59:  *
 60:  * @var array
 61:  */
 62:     public $components = array();
 63: 
 64: /**
 65:  * A component lookup table used to lazy load component objects.
 66:  *
 67:  * @var array
 68:  */
 69:     protected $_componentMap = array();
 70: 
 71: /**
 72:  * Constructor
 73:  *
 74:  * @param ComponentCollection $collection A ComponentCollection this component can use to lazy load its components
 75:  * @param array $settings Array of configuration settings.
 76:  */
 77:     public function __construct(ComponentCollection $collection, $settings = array()) {
 78:         $this->_Collection = $collection;
 79:         $this->settings = $settings;
 80:         $this->_set($settings);
 81:         if (!empty($this->components)) {
 82:             $this->_componentMap = ComponentCollection::normalizeObjectArray($this->components);
 83:         }
 84:     }
 85: 
 86: /**
 87:  * Magic method for lazy loading $components.
 88:  *
 89:  * @param string $name Name of component to get.
 90:  * @return mixed A Component object or null.
 91:  */
 92:     public function __get($name) {
 93:         if (isset($this->_componentMap[$name]) && !isset($this->{$name})) {
 94:             $settings = array_merge((array)$this->_componentMap[$name]['settings'], array('enabled' => false));
 95:             $this->{$name} = $this->_Collection->load($this->_componentMap[$name]['class'], $settings);
 96:         }
 97:         if (isset($this->{$name})) {
 98:             return $this->{$name};
 99:         }
100:     }
101: 
102: /**
103:  * Called before the Controller::beforeFilter().
104:  *
105:  * @param Controller $controller Controller with components to initialize
106:  * @return void
107:  * @link http://book.cakephp.org/2.0/en/controllers/components.html#Component::initialize
108:  */
109:     public function initialize(Controller $controller) {
110:     }
111: 
112: /**
113:  * Called after the Controller::beforeFilter() and before the controller action
114:  *
115:  * @param Controller $controller Controller with components to startup
116:  * @return void
117:  * @link http://book.cakephp.org/2.0/en/controllers/components.html#Component::startup
118:  */
119:     public function startup(Controller $controller) {
120:     }
121: 
122: /**
123:  * Called before the Controller::beforeRender(), and before 
124:  * the view class is loaded, and before Controller::render()
125:  *
126:  * @param Controller $controller Controller with components to beforeRender
127:  * @return void
128:  * @link http://book.cakephp.org/2.0/en/controllers/components.html#Component::beforeRender
129:  */
130:     public function beforeRender(Controller $controller) {
131:     }
132: 
133: /**
134:  * Called after Controller::render() and before the output is printed to the browser.
135:  *
136:  * @param Controller $controller Controller with components to shutdown
137:  * @return void
138:  * @link @link http://book.cakephp.org/2.0/en/controllers/components.html#Component::shutdown
139:  */
140:     public function shutdown(Controller $controller) {
141:     }
142: 
143: /**
144:  * Called before Controller::redirect().  Allows you to replace the url that will
145:  * be redirected to with a new url. The return of this method can either be an array or a string.
146:  *
147:  * If the return is an array and contains a 'url' key.  You may also supply the following:
148:  *
149:  * - `status` The status code for the redirect
150:  * - `exit` Whether or not the redirect should exit.
151:  *
152:  * If your response is a string or an array that does not contain a 'url' key it will
153:  * be used as the new url to redirect to.
154:  *
155:  * @param Controller $controller Controller with components to beforeRedirect
156:  * @param string|array $url Either the string or url array that is being redirected to.
157:  * @param integer $status The status code of the redirect
158:  * @param boolean $exit Will the script exit.
159:  * @return array|null Either an array or null.
160:  * @link @link http://book.cakephp.org/2.0/en/controllers/components.html#Component::beforeRedirect
161:  */
162:     public function beforeRedirect(Controller $controller, $url, $status = null, $exit = true) {
163:     }
164: 
165: }
166: 
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