<?php
  /**
   * Copyright (c) 2013 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\Session;
  
  /**
   * Class Internal
   *

   * store session data in an in-memory array, not persistent

   *
   * @package OC\Session
   */
  class Memory extends Session {
  	protected $data;
  
  	public function __construct($name) {
  		//no need to use $name since all data is already scoped to this instance
  		$this->data = array();
  	}
  
  	/**
  	 * @param string $key

  	 * @param integer $value

  	 */
  	public function set($key, $value) {

  		$this->validateSession();

  		$this->data[$key] = $value;
  	}
  
  	/**
  	 * @param string $key
  	 * @return mixed
  	 */
  	public function get($key) {
  		if (!$this->exists($key)) {
  			return null;
  		}
  		return $this->data[$key];
  	}
  
  	/**
  	 * @param string $key
  	 * @return bool
  	 */
  	public function exists($key) {
  		return isset($this->data[$key]);
  	}
  
  	/**
  	 * @param string $key
  	 */
  	public function remove($key) {

  		$this->validateSession();

  		unset($this->data[$key]);
  	}
  
  	public function clear() {
  		$this->data = array();
  	}

  
  	/**
  	 * Helper function for PHPUnit execution - don't use in non-test code
  	 */
  	public function reopen() {
  		$this->sessionClosed = false;
  	}
  
  	/**
  	 * In case the session has already been locked an exception will be thrown
  	 *
  	 * @throws \Exception
  	 */
  	private function validateSession() {
  		if ($this->sessionClosed) {
  			throw new \Exception('Session has been closed - no further changes to the session as allowed');
  		}
  	}

  }