<?php
/**
 * @package Habari
 *
 */

/**
 *
 * Contains the DisabledCache class, which disables caching
 */
class DisabledCache extends Cache
{
	/**
	 * Constructor for DisabledCache
	 */
	public function __construct()
	{
		// Do nothing but implement
	}

	/**
	 * Is record with $name in the cache?
	 *
	 * @param string $name name of the cached item
	 * @return boolean true if item is cached, false if not
	 */
	protected function _has( $name, $group )
	{
		return false;
	}

	/**
	 * Returns the named value from the cache.
	 *
	 * @param string $name The name of the cached item
	 * @return mixed The item value or null if it doesn't exist in cache
	 */
	protected function _get( $name, $group )
	{
		return null;
	}

	/**
	 * Returns the named values from a group of cache.
	 *
	 * @param string $name The name of the cached item
	 * @return array The cache records of the group
	 */
	protected function _get_group( $group )
	{
		return null;
	}

	/**
	 * Is group named $group in the cache?
	 *
	 * @param string $name name of the cached item
	 * @return boolean true if group is cached, false if not
	 */
	protected function _has_group( $group )
	{
		return null;
	}

	protected function _set( $name, $value, $expiry, $group, $keep )
	{
		return null;
	}

	/**
	 * Expires the named value from the cache.
	 *
	 * @param string $name The name of the cached item
	 * @param string $match_mode (optional) how to match bucket names ('strict', 'regex', 'glob') (default 'strict')
	 */
	protected function _expire( $name, $group, $match_mode = 'strict' )
	{
		return null;
	}

	/**
	 * Return whether a named cache value has expired
	 *
	 * @param string $name The name of the cached item
	 * @param string $group The group of the cached item
	 * @return boolean true if the stored value has expired
	 */
	protected function _expired( $name, $group )
	{
		return null;
	}

	/**
	 * Extend the expiration of the named cached value.
	 *
	 * @param string $name The name of the cached item
	 * @param integer $expiry The duration in seconds to extend the cache expiration by
	 */
	protected function _extend( $name, $expiry, $group )
	{
		return null;
	}

	/**
	 * Remove all cached items
	 */
	protected function _purge()
	{
		// Do nothing but implement
	}
}

?>