<?php
/**
 * Copyright 2010-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @category  Horde
 * @copyright 2010-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @link      http://pear.horde.org/index.php?package=Cache
 * @package   Cache
 */

/**
 * Cache storage in PHP memory.
 *
 * It persists only during a script run and ignores the object lifetime
 * because of that.
 *
 * @author     Gunnar Wrobel <wrobel@pardus.de>
 * @author     Michael Slusarz <slusarz@horde.org>
 * @category   Horde
 * @copyright  2010-2016 Horde LLC
 * @license    http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @link       http://pear.horde.org/index.php?package=Cache
 * @package    Cache
 * @since      2.5.0
 */
class Horde_Cache_Storage_Memory extends Horde_Cache_Storage_Base
{
    /**
     * Storage for this cache.
     *
     * @var array
     */
    private $_cache = array();

    /**
     */
    public function get($key, $lifetime = 0)
    {
        return isset($this->_cache[$key])
            ? $this->_cache[$key]
            : false;
    }

    /**
     */
    public function set($key, $data, $lifetime = 0)
    {
        $this->_cache[$key] = $data;
    }

    /**
     */
    public function exists($key, $lifetime = 0)
    {
        return isset($this->_cache[$key]);
    }

    /**
     */
    public function expire($key)
    {
        unset($this->_cache[$key]);
    }

    /**
     */
    public function clear()
    {
        $this->_cache = array();
    }

}
