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<?php
/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 	* Redistributions of source code must retain the above copyright notice, this list of
 * 	  conditions and the following disclaimer.
 *
 * 	* Redistributions in binary form must reproduce the above copyright notice, this list
 * 	  of conditions and the following disclaimer in the documentation and/or other materials
 * 	  provided with the distribution.
 *
 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used
 * 	  to endorse or promote products derived from this software without specific prior
 * 	  written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package SimplePie
 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Sam Sneddon
 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */

/**
 * Base for cache objects
 *
 * Classes to be used with {@see SimplePie_Cache::register()} are expected
 * to implement this interface.
 *
 * @package SimplePie
 * @subpackage Caching
 */
interface SimplePie_Cache_Base
{
	/**
	 * Feed cache type
	 *
	 * @var string
	 */
	const TYPE_FEED = 'spc';

	/**
	 * Image cache type
	 *
	 * @var string
	 */
	const TYPE_IMAGE = 'spi';

	/**
	 * Create a new cache object
	 *
	 * @param string $location Location string (from SimplePie::$cache_location)
	 * @param string $name Unique ID for the cache
	 * @param string $type Either TYPE_FEED for SimplePie data, or TYPE_IMAGE for image data
	 */
	public function __construct($location, $name, $type);

	/**
	 * Save data to the cache
	 *
	 * @param array|SimplePie $data Data to store in the cache. If passed a SimplePie object, only cache the $data property
	 * @return bool Successfulness
	 */
	public function save($data);

	/**
	 * Retrieve the data saved to the cache
	 *
	 * @return array Data for SimplePie::$data
	 */
	public function load();

	/**
	 * Retrieve the last modified time for the cache
	 *
	 * @return int Timestamp
	 */
	public function mtime();

	/**
	 * Set the last modified time to the current time
	 *
	 * @return bool Success status
	 */
	public function touch();

	/**
	 * Remove the cache
	 *
	 * @return bool Success status
	 */
	public function unlink();
}