1: <?php
  2: /**
  3:  * Components collection is used as a registry for loaded components and handles loading
  4:  * and constructing component class objects.
  5:  *
  6:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  7:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  8:  *
  9:  * Licensed under The MIT License
 10:  * For full copyright and license information, please see the LICENSE.txt
 11:  * Redistributions of files must retain the above copyright notice.
 12:  *
 13:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 14:  * @link          http://cakephp.org CakePHP(tm) Project
 15:  * @package       Cake.Controller
 16:  * @since         CakePHP(tm) v 2.0
 17:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 18:  */
 19: 
 20: App::uses('ObjectCollection', 'Utility');
 21: App::uses('Component', 'Controller');
 22: App::uses('CakeEventListener', 'Event');
 23: 
 24: /**
 25:  * Components collection is used as a registry for loaded components and handles loading
 26:  * and constructing component class objects.
 27:  *
 28:  * @package       Cake.Controller
 29:  */
 30: class ComponentCollection extends ObjectCollection implements CakeEventListener {
 31: 
 32: /**
 33:  * The controller that this collection was initialized with.
 34:  *
 35:  * @var Controller
 36:  */
 37:     protected $_Controller = null;
 38: 
 39: /**
 40:  * Initializes all the Components for a controller.
 41:  * Attaches a reference of each component to the Controller.
 42:  *
 43:  * @param Controller $Controller Controller to initialize components for.
 44:  * @return void
 45:  */
 46:     public function init(Controller $Controller) {
 47:         if (empty($Controller->components)) {
 48:             return;
 49:         }
 50:         $this->_Controller = $Controller;
 51:         $components = ComponentCollection::normalizeObjectArray($Controller->components);
 52:         foreach ($components as $name => $properties) {
 53:             $Controller->{$name} = $this->load($properties['class'], $properties['settings']);
 54:         }
 55:     }
 56: 
 57: /**
 58:  * Set the controller associated with the collection.
 59:  *
 60:  * @param Controller $Controller Controller to set
 61:  * @return void
 62:  */
 63:     public function setController(Controller $Controller) {
 64:         $this->_Controller = $Controller;
 65:     }
 66: 
 67: /**
 68:  * Get the controller associated with the collection.
 69:  *
 70:  * @return Controller Controller instance
 71:  */
 72:     public function getController() {
 73:         return $this->_Controller;
 74:     }
 75: 
 76: /**
 77:  * Loads/constructs a component. Will return the instance in the registry if it already exists.
 78:  * You can use `$settings['enabled'] = false` to disable callbacks on a component when loading it.
 79:  * Callbacks default to on. Disabled component methods work as normal, only callbacks are disabled.
 80:  *
 81:  * You can alias your component as an existing component by setting the 'className' key, i.e.,
 82:  * {{{
 83:  * public $components = array(
 84:  *   'Email' => array(
 85:  *     'className' => 'AliasedEmail'
 86:  *   );
 87:  * );
 88:  * }}}
 89:  * All calls to the `Email` component would use `AliasedEmail` instead.
 90:  *
 91:  * @param string $component Component name to load
 92:  * @param array $settings Settings for the component.
 93:  * @return Component A component object, Either the existing loaded component or a new one.
 94:  * @throws MissingComponentException when the component could not be found
 95:  */
 96:     public function load($component, $settings = array()) {
 97:         if (isset($settings['className'])) {
 98:             $alias = $component;
 99:             $component = $settings['className'];
100:         }
101:         list($plugin, $name) = pluginSplit($component, true);
102:         if (!isset($alias)) {
103:             $alias = $name;
104:         }
105:         if (isset($this->_loaded[$alias])) {
106:             return $this->_loaded[$alias];
107:         }
108:         $componentClass = $name . 'Component';
109:         App::uses($componentClass, $plugin . 'Controller/Component');
110:         if (!class_exists($componentClass)) {
111:             throw new MissingComponentException(array(
112:                 'class' => $componentClass,
113:                 'plugin' => substr($plugin, 0, -1)
114:             ));
115:         }
116:         $this->_loaded[$alias] = new $componentClass($this, $settings);
117:         $enable = isset($settings['enabled']) ? $settings['enabled'] : true;
118:         if ($enable) {
119:             $this->enable($alias);
120:         }
121:         return $this->_loaded[$alias];
122:     }
123: 
124: /**
125:  * Returns the implemented events that will get routed to the trigger function
126:  * in order to dispatch them separately on each component
127:  *
128:  * @return array
129:  */
130:     public function implementedEvents() {
131:         return array(
132:             'Controller.initialize' => array('callable' => 'trigger'),
133:             'Controller.startup' => array('callable' => 'trigger'),
134:             'Controller.beforeRender' => array('callable' => 'trigger'),
135:             'Controller.beforeRedirect' => array('callable' => 'trigger'),
136:             'Controller.shutdown' => array('callable' => 'trigger'),
137:         );
138:     }
139: 
140: }
141: