<?php
  /**
  * ownCloud
  *
  * @author Michael Gapczynski
  * @copyright 2012 Michael Gapczynski mtgap@owncloud.com
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
  * License as published by the Free Software Foundation; either
  * version 3 of the License, or any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
  
  namespace OC\Files\Cache;
  
  /**
   * check the storage backends for updates and change the cache accordingly
   */
  class Shared_Watcher extends Watcher {
  
  	/**
  	 * check $path for updates
  	 *
  	 * @param string $path
  	 */
  	public function checkUpdate($path) {

  		if (parent::checkUpdate($path) === true) {

  			// since checkUpdate() has already updated the size of the subdirs,
  			// only apply the update to the owner's parent dirs
  
  			// find last parent before reaching the shared storage root,
  			// which is the actual shared dir from the owner
  			$sepPos = strpos($path, '/');
  			if ($sepPos > 0) {
  				$baseDir = substr($path, 0, $sepPos);
  			} else {
  				$baseDir = $path;
  			}
  
  			// find the path relative to the data dir
  			$file = $this->storage->getFile($baseDir);
  			$view = new \OC\Files\View('/' . $file['fileOwner']);
  
  			// find the owner's storage and path
  			list($storage, $internalPath) = $view->resolvePath($file['path']);
  
  			// update the parent dirs' sizes in the owner's cache
  			$storage->getCache()->correctFolderSize(dirname($internalPath));
  
  			return true;

  		}

  		return false;

  	}
  
  	/**
  	 * remove deleted files in $path from the cache
  	 *
  	 * @param string $path
  	 */
  	public function cleanFolder($path) {
  		if ($path != '') {
  			parent::cleanFolder($path);
  		}
  	}

  }