/
StoppableIterator.php
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/
StoppableIterator.php
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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
* @since 3.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Collection\Iterator;
use Cake\Collection\Collection;
/**
* Creates an iterator from another iterator that will verify a condition on each
* step. If the condition evaluates to false, the iterator will not yield more
* results.
*/
class StoppableIterator extends Collection {
/**
* The condition to evaluate for each item of the collection
*
* @var callable
*/
protected $_condition;
/**
* Creates an iterator that can be stopped based on a condition provided by a callback.
*
* Each time the condition callback is executed it will receive the value of the element
* in the current iteration, the key of the element and the passed $items iterator
* as arguments, in that order.
*
* @param array|\Traversable $items The list of values to iterate
* @param callable $condition A function that will be called for ech item in
* the collection, if the result evaluates to false, no more items will be
* yielded from this iterator.
*/
public function __construct($items, callable $condition) {
$this->_condition = $condition;
parent::__construct($items);
}
/**
* Evaluates the condition and returns its result, this controls
* whther or not more results are yielded
*
* @return bool
*/
public function valid() {
if (!parent::valid()) {
return false;
}
$current = $this->current();
$key = $this->key();
$condition = $this->_condition;
return !$condition($current, $key, $this);
}
}