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<?php
/**
* 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
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
/**
* Deals with Collections of objects. Keeping registries of those objects,
* loading and constructing new objects and triggering callbacks. Each subclass needs
* to implement its own load() functionality.
*
* All core subclasses of ObjectCollection by convention loaded objects are stored
* in `$this->_loaded`. Enabled objects are stored in `$this->_enabled`. In addition
* the all support an `enabled` option that controls the enabled/disabled state of the object
* when loaded.
*
* @package Cake.Utility
* @since CakePHP(tm) v 2.0
*/
abstract class ObjectCollection {
/**
* List of the currently-enabled objects
*
* @var array
*/
protected $_enabled = array();
/**
* A hash of loaded objects, indexed by name
*
* @var array
*/
protected $_loaded = array();
/**
* Default object priority. A non zero integer.
*
* @var int
*/
public $defaultPriority = 10;
/**
* Loads a new object onto the collection. Can throw a variety of exceptions
*
* Implementations of this class support a `$options['enabled']` flag which enables/disables
* a loaded object.
*
* @param string $name Name of object to load.
* @param array $options Array of configuration options for the object to be constructed.
* @return object the constructed object
*/
abstract public function load($name, $options = array());
/**
* Trigger a callback method on every object in the collection.
* Used to trigger methods on objects in the collection. Will fire the methods in the
* order they were attached.
*
* ### Options
*
* - `breakOn` Set to the value or values you want the callback propagation to stop on.
* Can either be a scalar value, or an array of values to break on. Defaults to `false`.
*
* - `break` Set to true to enabled breaking. When a trigger is broken, the last returned value
* will be returned. If used in combination with `collectReturn` the collected results will be returned.
* Defaults to `false`.
*
* - `collectReturn` Set to true to collect the return of each object into an array.
* This array of return values will be returned from the trigger() call. Defaults to `false`.
*
* - `modParams` Allows each object the callback gets called on to modify the parameters to the next object.
* Setting modParams to an integer value will allow you to modify the parameter with that index.
* Any non-null value will modify the parameter index indicated.
* Defaults to false.
*
*
* @param string $callback|CakeEvent Method to fire on all the objects. Its assumed all the objects implement
* the method you are calling. If an instance of CakeEvent is provided, then then Event name will parsed to
* get the callback name. This is done by getting the last word after any dot in the event name
* (eg. `Model.afterSave` event will trigger the `afterSave` callback)
* @param array $params Array of parameters for the triggered callback.
* @param array $options Array of options.
* @return mixed Either the last result or all results if collectReturn is on.
* @throws CakeException when modParams is used with an index that does not exist.
*/
public function trigger($callback, $params = array(), $options = array()) {
if (empty($this->_enabled)) {
return true;
}
if ($callback instanceof CakeEvent) {
if (is_array($callback->data)) {
$params = $callback->data;
}
$params = array($callback->subject());
$callback = array_pop(explode('.', $callback->name()));
}
$options = array_merge(
array(
'break' => false,
'breakOn' => false,
'collectReturn' => false,
'modParams' => false
),
$options
);
$collected = array();
$list = array_keys($this->_enabled);
if ($options['modParams'] !== false && !isset($params[$options['modParams']])) {
throw new CakeException(__d('cake_dev', 'Cannot use modParams with indexes that do not exist.'));
}
foreach ($list as $name) {
$result = call_user_func_array(array($this->_loaded[$name], $callback), $params);
if ($options['collectReturn'] === true) {
$collected[] = $result;
}
if (
$options['break'] && ($result === $options['breakOn'] ||
(is_array($options['breakOn']) && in_array($result, $options['breakOn'], true)))
) {
return $result;
} elseif ($options['modParams'] !== false && !in_array($result, array(true, false, null), true)) {
$params[$options['modParams']] = $result;
}
}
if ($options['modParams'] !== false) {
return $params[$options['modParams']];
}
return $options['collectReturn'] ? $collected : $result;
}
/**
* Provide public read access to the loaded objects
*
* @param string $name Name of property to read
* @return mixed
*/
public function __get($name) {
if (isset($this->_loaded[$name])) {
return $this->_loaded[$name];
}
return null;
}
/**
* Provide isset access to _loaded
*
* @param string $name Name of object being checked.
* @return boolean
*/
public function __isset($name) {
return isset($this->_loaded[$name]);
}
/**
* Enables callbacks on an object or array of objects
*
* @param string|array $name CamelCased name of the object(s) to enable (string or array)
* @param boolean Prioritize enabled list after enabling object(s)
* @return void
*/
public function enable($name, $prioritize = true) {
$enabled = false;
foreach ((array)$name as $object) {
if (isset($this->_loaded[$object]) && !isset($this->_enabled[$object])) {
$priority = isset($this->_loaded[$object]->settings['priority']) ? $this->_loaded[$object]->settings['priority'] : $this->defaultPriority;
$this->_enabled[$object] = array($priority);
$enabled = true;
}
}
if ($prioritize && $enabled) {
$this->prioritize();
}
}
/**
* Prioritize list of enabled object
*
* @return array Prioritized list of object
*/
public function prioritize() {
$i = 1;
foreach ($this->_enabled as $name => $priority) {
$priority[1] = $i++;
$this->_enabled[$name] = $priority;
}
asort($this->_enabled);
return $this->_enabled;
}
/**
* Set priority for an object or array of objects
*
* @param string|array $name CamelCased name of the object(s) to enable (string or array)
* If string the second param $priority is used else it should be an associative array
* with keys as object names and values as priorities to set.
* @param int|null Integer priority to set or null for default
* @return void
*/
public function setPriority($name, $priority = null) {
if (is_string($name)) {
$name = array($name => $priority);
}
foreach ($name as $obj => $prio) {
if (isset($this->_loaded[$obj])) {
if (is_null($prio)) {
$prio = $this->defaultPriority;
}
$this->_loaded[$obj]->settings['priority'] = $prio;
if (isset($this->_enabled[$obj])) {
$this->_enabled[$obj] = array($prio);
}
}
}
$this->prioritize();
}
/**
* Disables callbacks on a object or array of objects. Public object methods are still
* callable as normal.
*
* @param string|array $name CamelCased name of the objects(s) to disable (string or array)
* @return void
*/
public function disable($name) {
foreach ((array)$name as $object) {
unset($this->_enabled[$object]);
}
}
/**
* Gets the list of currently-enabled objects, or, the current status of a single objects
*
* @param string $name Optional. The name of the object to check the status of. If omitted,
* returns an array of currently-enabled object
* @return mixed If $name is specified, returns the boolean status of the corresponding object.
* Otherwise, returns an array of all enabled objects.
*/
public function enabled($name = null) {
if (!empty($name)) {
return isset($this->_enabled[$name]);
}
return array_keys($this->_enabled);
}
/**
* Gets the list of attached behaviors, or, whether the given behavior is attached
*
* @param string $name Optional. The name of the behavior to check the status of. If omitted,
* returns an array of currently-attached behaviors
* @return mixed If $name is specified, returns the boolean status of the corresponding behavior.
* Otherwise, returns an array of all attached behaviors.
*/
public function attached($name = null) {
if (!empty($name)) {
return isset($this->_loaded[$name]);
}
return array_keys($this->_loaded);
}
/**
* Name of the object to remove from the collection
*
* @param string $name Name of the object to delete.
* @return void
*/
public function unload($name) {
list($plugin, $name) = pluginSplit($name);
unset($this->_loaded[$name]);
unset($this->_enabled[$name]);
}
/**
* Adds or overwrites an instantiated object to the collection
*
* @param string $name Name of the object
* @param Object $object The object to use
* @return array Loaded objects
*/
public function set($name = null, $object = null) {
if (!empty($name) && !empty($object)) {
list($plugin, $name) = pluginSplit($name);
$this->_loaded[$name] = $object;
}
return $this->_loaded;
}
/**
* Normalizes an object array, creates an array that makes lazy loading
* easier
*
* @param array $objects Array of child objects to normalize.
* @return array Array of normalized objects.
*/
public static function normalizeObjectArray($objects) {
$normal = array();
foreach ($objects as $i => $objectName) {
$options = array();
if (!is_int($i)) {
$options = (array)$objectName;
$objectName = $i;
}
list($plugin, $name) = pluginSplit($objectName);
$normal[$name] = array('class' => $objectName, 'settings' => $options);
}
return $normal;
}
}
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