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<?php |
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/* |
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* This file is part of the php-vfs package. |
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* |
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* (c) Michael Donat <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace VirtualFileSystem\Structure; |
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use SplObjectStorage; |
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/** |
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* Object representation of File. |
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* |
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* @author Michael Donat <[email protected]> |
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* @package php-vfs |
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*/ |
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class File extends Node |
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{ |
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/** |
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* @see http://man7.org/linux/man-pages/man2/lstat.2.html |
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*/ |
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const S_IFTYPE = 0100000; |
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protected $data; |
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/** |
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* Resource with exclusive lock on this file |
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* @var resource|null |
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*/ |
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private $exclusiveLock = null; |
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/** |
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* Resources with a shared lock on this file |
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* @var SplObjectStorage |
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*/ |
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private $sharedLock; |
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/** |
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* @inherit |
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* @param string $basename |
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*/ |
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public function __construct($basename) |
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{ |
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parent::__construct($basename); |
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$this->sharedLock = new SplObjectStorage; |
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} |
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/** |
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* Returns contents size. |
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* |
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* @return int |
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*/ |
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public function size() |
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{ |
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return strlen($this->data); |
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} |
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/** |
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* Returns contents. |
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* |
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* @return null|string |
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*/ |
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public function data() |
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{ |
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return $this->data; |
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} |
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/** |
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* Sets contents. |
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* |
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* @param $data |
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* @param null|string $data |
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*/ |
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public function setData($data) |
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{ |
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$this->data = $data; |
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} |
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public function lock($resource, $operation) |
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{ |
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if ($this->exclusiveLock === $resource) { |
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$this->exclusiveLock = null; |
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} else { |
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$this->sharedLock->detach($resource); |
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} |
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if ($operation & LOCK_NB) { |
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$operation -= LOCK_NB; |
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} |
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$unlock = $operation === LOCK_UN; |
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$exclusive = $operation === LOCK_EX; |
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if ($unlock) { |
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return true; |
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} |
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if ($this->exclusiveLock !== null) { |
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return false; |
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} |
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if (!$exclusive) { |
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$this->sharedLock->attach($resource); |
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return true; |
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} |
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if ($this->sharedLock->count()) { |
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return false; |
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} |
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$this->exclusiveLock = $resource; |
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return true; |
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} |
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} |
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michael-donat /
php-vfs
