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<?php
/**
* Copyright (c) 2015 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Licensed under the MIT license:
* http://opensource.org/licenses/MIT
*/
namespace Icewind\Streams;
/**
* Wrapper allows filtering of directories
*
* The filter callback will be called for each entry in the folder
* when the callback return false the entry will be filtered out
*/
class DirectoryFilter extends DirectoryWrapper {
/**
* @var callable
*/
private $filter;
/**
* @param string $path
* @param array $options
* @return bool
*/
public function dir_opendir($path, $options) {
$context = $this->loadContext();
$this->filter = $context['filter'];
return true;
}
/**
* @return string
*/
public function dir_readdir() {
$file = readdir($this->source);
$filter = $this->filter;
// keep reading until we have an accepted entry or we're at the end of the folder
while ($file !== false && $filter($file) === false) {
$file = readdir($this->source);
}
return $file;
}
/**
* @param resource $source
* @param callable $filter
* @return resource|bool
*/
public static function wrap($source, callable $filter) {
return self::wrapSource($source, [
'source' => $source,
'filter' => $filter
]);
}
}
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