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<?php
/**
* CakePHP : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://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. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP Project
* @since 3.3.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Event\Decorator;
use Cake\Event\Event;
use RuntimeException;
/**
* Event Condition Decorator
*
* Use this decorator to allow your event listener to only
* be invoked if the `if` and/or `unless` conditions pass.
*/
class ConditionDecorator extends AbstractDecorator
{
/**
* {@inheritDoc}
*/
public function __invoke()
{
$args = func_get_args();
if (!$this->canTrigger($args[0])) {
return;
}
return $this->_call($args);
}
/**
* Checks if the event is triggered for this listener.
*
* @param \Cake\Event\Event $event Event object.
* @return bool
*/
public function canTrigger(Event $event)
{
$if = $this->_evaluateCondition('if', $event);
$unless = $this->_evaluateCondition('unless', $event);
return $if && !$unless;
}
/**
* Evaluates the filter conditions
*
* @param string $condition Condition type
* @param \Cake\Event\Event $event Event object
* @return bool
*/
protected function _evaluateCondition($condition, Event $event)
{
if (!isset($this->_options[$condition])) {
return $condition !== 'unless';
}
if (!is_callable($this->_options[$condition])) {
throw new RuntimeException(self::class . ' the `' . $condition . '` condition is not a callable!');
}
return $this->_options[$condition]($event);
}
}