<?php
  /**
   * Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC\Files\Storage;
  
  class Loader {
  	/**
  	 * @var callable[] $storageWrappers
  	 */
  	private $storageWrappers = array();
  
  	/**
  	 * allow modifier storage behaviour by adding wrappers around storages
  	 *
  	 * $callback should be a function of type (string $mountPoint, Storage $storage) => Storage
  	 *
  	 * @param callable $callback
  	 */

  	public function addStorageWrapper($wrapperName, $callback) {
  		$this->storageWrappers[$wrapperName] = $callback;

  	}

  	/**
  	 * @param string|boolean $mountPoint
  	 * @param string $class
  	 */

  	public function load($mountPoint, $class, $arguments) {
  		return $this->wrap($mountPoint, new $class($arguments));
  	}

  	/**
  	 * @param string|boolean $mountPoint
  	 */

  	public function wrap($mountPoint, $storage) {
  		foreach ($this->storageWrappers as $wrapper) {
  			$storage = $wrapper($mountPoint, $storage);
  		}
  		return $storage;
  	}
  }