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  1: <?php
  2: /**
  3:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  4:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  5:  *
  6:  * Licensed under The MIT License
  7:  * For full copyright and license information, please see the LICENSE.txt
  8:  * Redistributions of files must retain the above copyright notice.
  9:  *
 10:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 11:  * @link          http://cakephp.org CakePHP(tm) Project
 12:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 13:  */
 14: 
 15: /**
 16:  * Deals with Collections of objects. Keeping registries of those objects,
 17:  * loading and constructing new objects and triggering callbacks. Each subclass needs
 18:  * to implement its own load() functionality.
 19:  *
 20:  * All core subclasses of ObjectCollection by convention loaded objects are stored
 21:  * in `$this->_loaded`. Enabled objects are stored in `$this->_enabled`. In addition,
 22:  * they all support an `enabled` option that controls the enabled/disabled state of the object
 23:  * when loaded.
 24:  *
 25:  * @package       Cake.Utility
 26:  * @since CakePHP(tm) v 2.0
 27:  */
 28: abstract class ObjectCollection {
 29: 
 30: /**
 31:  * List of the currently-enabled objects
 32:  *
 33:  * @var array
 34:  */
 35:     protected $_enabled = array();
 36: 
 37: /**
 38:  * A hash of loaded objects, indexed by name
 39:  *
 40:  * @var array
 41:  */
 42:     protected $_loaded = array();
 43: 
 44: /**
 45:  * Default object priority. A non zero integer.
 46:  *
 47:  * @var integer
 48:  */
 49:     public $defaultPriority = 10;
 50: 
 51: /**
 52:  * Loads a new object onto the collection. Can throw a variety of exceptions
 53:  *
 54:  * Implementations of this class support a `$options['enabled']` flag which enables/disables
 55:  * a loaded object.
 56:  *
 57:  * @param string $name Name of object to load.
 58:  * @param array $options Array of configuration options for the object to be constructed.
 59:  * @return object the constructed object
 60:  */
 61:     abstract public function load($name, $options = array());
 62: 
 63: /**
 64:  * Trigger a callback method on every object in the collection.
 65:  * Used to trigger methods on objects in the collection. Will fire the methods in the
 66:  * order they were attached.
 67:  *
 68:  * ### Options
 69:  *
 70:  * - `breakOn` Set to the value or values you want the callback propagation to stop on.
 71:  *    Can either be a scalar value, or an array of values to break on. Defaults to `false`.
 72:  *
 73:  * - `break` Set to true to enabled breaking. When a trigger is broken, the last returned value
 74:  *    will be returned. If used in combination with `collectReturn` the collected results will be returned.
 75:  *    Defaults to `false`.
 76:  *
 77:  * - `collectReturn` Set to true to collect the return of each object into an array.
 78:  *    This array of return values will be returned from the trigger() call. Defaults to `false`.
 79:  *
 80:  * - `modParams` Allows each object the callback gets called on to modify the parameters to the next object.
 81:  *    Setting modParams to an integer value will allow you to modify the parameter with that index.
 82:  *    Any non-null value will modify the parameter index indicated.
 83:  *    Defaults to false.
 84:  *
 85:  *
 86:  * @param string $callback|CakeEvent Method to fire on all the objects. Its assumed all the objects implement
 87:  *   the method you are calling. If an instance of CakeEvent is provided, then then Event name will parsed to
 88:  *   get the callback name. This is done by getting the last word after any dot in the event name
 89:  *   (eg. `Model.afterSave` event will trigger the `afterSave` callback)
 90:  * @param array $params Array of parameters for the triggered callback.
 91:  * @param array $options Array of options.
 92:  * @return mixed Either the last result or all results if collectReturn is on.
 93:  * @throws CakeException when modParams is used with an index that does not exist.
 94:  */
 95:     public function trigger($callback, $params = array(), $options = array()) {
 96:         if (empty($this->_enabled)) {
 97:             return true;
 98:         }
 99:         if ($callback instanceof CakeEvent) {
100:             $event = $callback;
101:             if (is_array($event->data)) {
102:                 $params =& $event->data;
103:             }
104:             if (empty($event->omitSubject)) {
105:                 $subject = $event->subject();
106:             }
107: 
108:             foreach (array('break', 'breakOn', 'collectReturn', 'modParams') as $opt) {
109:                 if (isset($event->{$opt})) {
110:                     $options[$opt] = $event->{$opt};
111:                 }
112:             }
113:             $parts = explode('.', $event->name());
114:             $callback = array_pop($parts);
115:         }
116:         $options = array_merge(
117:             array(
118:                 'break' => false,
119:                 'breakOn' => false,
120:                 'collectReturn' => false,
121:                 'modParams' => false
122:             ),
123:             $options
124:         );
125:         $collected = array();
126:         $list = array_keys($this->_enabled);
127:         if ($options['modParams'] !== false && !isset($params[$options['modParams']])) {
128:             throw new CakeException(__d('cake_dev', 'Cannot use modParams with indexes that do not exist.'));
129:         }
130:         $result = null;
131:         foreach ($list as $name) {
132:             $result = call_user_func_array(array($this->_loaded[$name], $callback), compact('subject') + $params);
133:             if ($options['collectReturn'] === true) {
134:                 $collected[] = $result;
135:             }
136:             if (
137:                 $options['break'] && ($result === $options['breakOn'] ||
138:                 (is_array($options['breakOn']) && in_array($result, $options['breakOn'], true)))
139:             ) {
140:                 return $result;
141:             } elseif ($options['modParams'] !== false && !in_array($result, array(true, false, null), true)) {
142:                 $params[$options['modParams']] = $result;
143:             }
144:         }
145:         if ($options['modParams'] !== false) {
146:             return $params[$options['modParams']];
147:         }
148:         return $options['collectReturn'] ? $collected : $result;
149:     }
150: 
151: /**
152:  * Provide public read access to the loaded objects
153:  *
154:  * @param string $name Name of property to read
155:  * @return mixed
156:  */
157:     public function __get($name) {
158:         if (isset($this->_loaded[$name])) {
159:             return $this->_loaded[$name];
160:         }
161:         return null;
162:     }
163: 
164: /**
165:  * Provide isset access to _loaded
166:  *
167:  * @param string $name Name of object being checked.
168:  * @return boolean
169:  */
170:     public function __isset($name) {
171:         return isset($this->_loaded[$name]);
172:     }
173: 
174: /**
175:  * Enables callbacks on an object or array of objects
176:  *
177:  * @param string|array $name CamelCased name of the object(s) to enable (string or array)
178:  * @param boolean Prioritize enabled list after enabling object(s)
179:  * @return void
180:  */
181:     public function enable($name, $prioritize = true) {
182:         $enabled = false;
183:         foreach ((array)$name as $object) {
184:             if (isset($this->_loaded[$object]) && !isset($this->_enabled[$object])) {
185:                 $priority = $this->defaultPriority;
186:                 if (isset($this->_loaded[$object]->settings['priority'])) {
187:                     $priority = $this->_loaded[$object]->settings['priority'];
188:                 }
189:                 $this->_enabled[$object] = array($priority);
190:                 $enabled = true;
191:             }
192:         }
193:         if ($prioritize && $enabled) {
194:             $this->prioritize();
195:         }
196:     }
197: 
198: /**
199:  * Prioritize list of enabled object
200:  *
201:  * @return array Prioritized list of object
202:  */
203:     public function prioritize() {
204:         $i = 1;
205:         foreach ($this->_enabled as $name => $priority) {
206:             $priority[1] = $i++;
207:             $this->_enabled[$name] = $priority;
208:         }
209:         asort($this->_enabled);
210:         return $this->_enabled;
211:     }
212: 
213: /**
214:  * Set priority for an object or array of objects
215:  *
216:  * @param string|array $name CamelCased name of the object(s) to enable (string or array)
217:  *  If string the second param $priority is used else it should be an associative array
218:  *  with keys as object names and values as priorities to set.
219:  * @param integer|null Integer priority to set or null for default
220:  * @return void
221:  */
222:     public function setPriority($name, $priority = null) {
223:         if (is_string($name)) {
224:             $name = array($name => $priority);
225:         }
226:         foreach ($name as $object => $objectPriority) {
227:             if (isset($this->_loaded[$object])) {
228:                 if ($objectPriority === null) {
229:                     $objectPriority = $this->defaultPriority;
230:                 }
231:                 $this->_loaded[$object]->settings['priority'] = $objectPriority;
232:                 if (isset($this->_enabled[$object])) {
233:                     $this->_enabled[$object] = array($objectPriority);
234:                 }
235:             }
236:         }
237:         $this->prioritize();
238:     }
239: 
240: /**
241:  * Disables callbacks on a object or array of objects. Public object methods are still
242:  * callable as normal.
243:  *
244:  * @param string|array $name CamelCased name of the objects(s) to disable (string or array)
245:  * @return void
246:  */
247:     public function disable($name) {
248:         foreach ((array)$name as $object) {
249:             unset($this->_enabled[$object]);
250:         }
251:     }
252: 
253: /**
254:  * Gets the list of currently-enabled objects, or, the current status of a single objects
255:  *
256:  * @param string $name Optional. The name of the object to check the status of. If omitted,
257:  *   returns an array of currently-enabled object
258:  * @return mixed If $name is specified, returns the boolean status of the corresponding object.
259:  *   Otherwise, returns an array of all enabled objects.
260:  */
261:     public function enabled($name = null) {
262:         if (!empty($name)) {
263:             return isset($this->_enabled[$name]);
264:         }
265:         return array_keys($this->_enabled);
266:     }
267: 
268: /**
269:  * Gets the list of attached objects, or, whether the given object is attached
270:  *
271:  * @param string $name Optional. The name of the object to check the status of. If omitted,
272:  *   returns an array of currently-attached objects
273:  * @return mixed If $name is specified, returns the boolean status of the corresponding object.
274:  *    Otherwise, returns an array of all attached objects.
275:  * @deprecated Will be removed in 3.0. Use loaded instead.
276:  */
277:     public function attached($name = null) {
278:         return $this->loaded($name);
279:     }
280: 
281: /**
282:  * Gets the list of loaded objects, or, whether the given object is loaded
283:  *
284:  * @param string $name Optional. The name of the object to check the status of. If omitted,
285:  *   returns an array of currently-loaded objects
286:  * @return mixed If $name is specified, returns the boolean status of the corresponding object.
287:  *    Otherwise, returns an array of all loaded objects.
288:  */
289:     public function loaded($name = null) {
290:         if (!empty($name)) {
291:             return isset($this->_loaded[$name]);
292:         }
293:         return array_keys($this->_loaded);
294:     }
295: 
296: /**
297:  * Name of the object to remove from the collection
298:  *
299:  * @param string $name Name of the object to delete.
300:  * @return void
301:  */
302:     public function unload($name) {
303:         list(, $name) = pluginSplit($name);
304:         unset($this->_loaded[$name], $this->_enabled[$name]);
305:     }
306: 
307: /**
308:  * Adds or overwrites an instantiated object to the collection
309:  *
310:  * @param string $name Name of the object
311:  * @param Object $object The object to use
312:  * @return array Loaded objects
313:  */
314:     public function set($name = null, $object = null) {
315:         if (!empty($name) && !empty($object)) {
316:             list(, $name) = pluginSplit($name);
317:             $this->_loaded[$name] = $object;
318:         }
319:         return $this->_loaded;
320:     }
321: 
322: /**
323:  * Normalizes an object array, creates an array that makes lazy loading
324:  * easier
325:  *
326:  * @param array $objects Array of child objects to normalize.
327:  * @return array Array of normalized objects.
328:  */
329:     public static function normalizeObjectArray($objects) {
330:         $normal = array();
331:         foreach ($objects as $i => $objectName) {
332:             $options = array();
333:             if (!is_int($i)) {
334:                 $options = (array)$objectName;
335:                 $objectName = $i;
336:             }
337:             list(, $name) = pluginSplit($objectName);
338:             $normal[$name] = array('class' => $objectName, 'settings' => $options);
339:         }
340:         return $normal;
341:     }
342: 
343: }
344: 
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