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<?php defined('SYSPATH') or die('No direct script access.');
/**
 * See [Kohana_Cache_Memcache]
 * 
* @package    Kohana/Cache
* @category   Base
* @version    2.0
* @author     Kohana Team
* @copyright  (c) 2009-2010 Kohana Team
* @license    http://kohanaphp.com/license
 */
class Kohana_Cache_MemcacheTag extends Cache_Memcache implements Cache_Tagging {

/** 
	 * Constructs the memcache object
	 *
	 * @param  array     configuration
	 * @throws  Cache_Exception
	 */
	protected function __construct(array $config)
	{
		parent::__construct($config);

if ( ! method_exists($this->_memcache, 'tag_add'))
		{
			throw new Cache_Exception('Memcached-tags PHP plugin not present. Please see http://code.google.com/p/memcached-tags/ for more information');
		}
	}

/**
	 * Set a value based on an id with tags
	 * 
	 * @param   string   id 
	 * @param   mixed    data 
	 * @param   integer  lifetime [Optional]
	 * @param   array    tags [Optional]
	 * @return  boolean
	 */
	public function set_with_tags($id, $data, $lifetime = NULL, array $tags = NULL)
	{
		$id = $this->_sanitize_id($id);

$result = $this->set($id, $data, $lifetime);

if ($result and $tags)
		{
			foreach ($tags as $tag)
			{
				$this->_memcache->tag_add($tag, $id);
			}
		}

return $result;
	}

/**
	 * Delete cache entries based on a tag
	 *
	 * @param   string   tag 
	 * @return  boolean
	 */
	public function delete_tag($tag)
	{
		return $this->_memcache->tag_delete($tag);
	}

/**
	 * Find cache entries based on a tag
	 *
	 * @param   string   tag 
	 * @return  void
	 * @throws  Cache_Exception
	 */
	public function find($tag)
	{
		throw new Cache_Exception('Memcached-tags does not support finding by tag');
	}	
}