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<?php

/**

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

/**

 * 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,

 * they 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|CakeEvent $callback 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) {

			$event = $callback;

			if (is_array($event->data)) {

				$params =& $event->data;

			}

			if (empty($event->omitSubject)) {

				$subject = $event->subject();

			}

			foreach (array('break', 'breakOn', 'collectReturn', 'modParams') as $opt) {

				if (isset($event->{$opt})) {

					$options[$opt] = $event->{$opt};

				}

			}

			$parts = explode('.', $event->name());

			$callback = array_pop($parts);

		}

		$options += array(

			'break' => false,

			'breakOn' => false,

			'collectReturn' => false,

			'modParams' => false

		);

		$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.'));

		}

		$result = null;

		foreach ($list as $name) {

			$result = call_user_func_array(array($this->_loaded[$name], $callback), compact('subject') + $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 bool

 */

	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 bool $prioritize 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 = $this->defaultPriority;

				if (isset($this->_loaded[$object]->settings['priority'])) {

					$priority = $this->_loaded[$object]->settings['priority'];

				}

				$this->_enabled[$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 $priority 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 $object => $objectPriority) {

			if (isset($this->_loaded[$object])) {

				if ($objectPriority === null) {

					$objectPriority = $this->defaultPriority;

				}

				$this->_loaded[$object]->settings['priority'] = $objectPriority;

				if (isset($this->_enabled[$object])) {

					$this->_enabled[$object] = array($objectPriority);

				}

			}

		}

		$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 objects, or, whether the given object is attached

 *

 * @param string $name Optional. The name of the object to check the status of. If omitted,

 *   returns an array of currently-attached objects

 * @return mixed If $name is specified, returns the boolean status of the corresponding object.

 *    Otherwise, returns an array of all attached objects.

 * @deprecated Will be removed in 3.0. Use loaded instead.

 */

	public function attached($name = null) {

		return $this->loaded($name);

	}

/**

 * Gets the list of loaded objects, or, whether the given object is loaded

 *

 * @param string $name Optional. The name of the object to check the status of. If omitted,

 *   returns an array of currently-loaded objects

 * @return mixed If $name is specified, returns the boolean status of the corresponding object.

 *    Otherwise, returns an array of all loaded objects.

 */

	public function loaded($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(, $name) = pluginSplit($name);

		unset($this->_loaded[$name], $this->_enabled[$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(, $name) = pluginSplit($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(, $name) = pluginSplit($objectName);

			$normal[$name] = array('class' => $objectName, 'settings' => $options);

		}

		return $normal;

	}

}