filesystem.php

<?php

/**
* ownCloud
*
* @author Frank Karlitschek 
* @copyright 2010 Frank Karlitschek karlitschek@kde.org 
* 
* 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/>.
* 
*/


/**
 * Class for abstraction of filesystem functions
 * This class won't call any filesystem functions for itself but but will pass them to the correct OC_Filestorage object
 * this class should also handle all the file premission related stuff
 *
 * Hooks provided:
 *   read(path)
 *   write(path, &run)
 *   post_write(path)
 *   create(path, &run) (when a file is created, both create and write will be emited in that order)
 *   post_create(path)
 *   delete(path, &run)
 *   post_delete(path)
 *   rename(oldpath,newpath, &run)
 *   post_rename(oldpath,newpath)
 *   copy(oldpath,newpath, &run) (if the newpath doesn't exists yes, copy, create and write will be emited in that order)
 *   post_rename(oldpath,newpath)
 *
 *   the &run parameter can be set to false to prevent the operation from occuring
 */

class OC_Filesystem{
	static private $storages=array();
	static private $mounts=array();
	static private $storageTypes=array();
	public static $loaded=false;
	private $fakeRoot='';
	static private $defaultInstance;


  /**
   * classname which used for hooks handling
   * used as signalclass in OC_Hooks::emit()
   */
  const CLASSNAME = 'OC_Filesystem';

  /**
   * signalname emited before file renaming
   * @param oldpath
   * @param newpath
   */
  const signal_rename = 'rename';

  /**
   * signal emited after file renaming
   * @param oldpath