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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_EventManager
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
require_once 'Zend/EventManager/Filter.php';
require_once 'Zend/EventManager/Filter/FilterIterator.php';
require_once 'Zend/Stdlib/CallbackHandler.php';
/**
* FilterChain: intercepting filter manager
*
* @category Zend
* @package Zend_EventManager
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_EventManager_FilterChain implements Zend_EventManager_Filter
{
/**
* @var Zend_EventManager_Filter_FilterIterator All filters
*/
protected $filters;
/**
* Constructor
*
* Initializes Zend_EventManager_Filter_FilterIterator in which filters will be aggregated
*
* @return void
*/
public function __construct()
{
$this->filters = new Zend_EventManager_Filter_FilterIterator();
}
/**
* Apply the filters
*
* Begins iteration of the filters.
*
* @param mixed $context Object under observation
* @param mixed $argv Associative array of arguments
* @return mixed
*/
public function run($context, array $argv = array())
{
$chain = clone $this->getFilters();
if ($chain->isEmpty()) {
return;
}
$next = $chain->extract();
if (!$next instanceof Zend_Stdlib_CallbackHandler) {
return;
}
return call_user_func($next->getCallback(), $context, $argv, $chain);
}
/**
* Connect a filter to the chain
*
* @param callback $callback PHP Callback
* @param int $priority Priority in the queue at which to execute; defaults to 1 (higher numbers == higher priority)
* @return Zend_Stdlib_CallbackHandler (to allow later unsubscribe)
*/
public function attach($callback, $priority = 1)
{
if (empty($callback)) {
require_once 'Zend/Stdlib/Exception/InvalidCallbackException.php';
throw new Zend_Stdlib_Exception_InvalidCallbackException('No callback provided');
}
$filter = new Zend_Stdlib_CallbackHandler($callback, array('priority' => $priority));
$this->filters->insert($filter, $priority);
return $filter;
}
/**
* Detach a filter from the chain
*
* @param Zend_Stdlib_CallbackHandler $filter
* @return bool Returns true if filter found and unsubscribed; returns false otherwise
*/
public function detach(Zend_Stdlib_CallbackHandler $filter)
{
return $this->filters->remove($filter);
}
/**
* Retrieve all filters
*
* @return Zend_EventManager_Filter_FilterIterator
*/
public function getFilters()
{
return $this->filters;
}
/**
* Clear all filters
*
* @return void
*/
public function clearFilters()
{
$this->filters = new Zend_EventManager_Filter_FilterIterator();
}
/**
* Return current responses
*
* Only available while the chain is still being iterated. Returns the
* current ResponseCollection.
*
* @return null|Zend_EventManager_ResponseCollection
*/
public function getResponses()
{
return $this->responses;
}
}
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