<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey 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

 * @version 1.3.1

 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Geoffrey Sneddon

 * @author Ryan McCue

 * @link http://simplepie.org/ SimplePie

 * @license http://www.opensource.org/licenses/bsd-license.php BSD License

 */

/**

 * Caches data to the filesystem

 *

 * @package SimplePie

 * @subpackage Caching

 */

class SimplePie_Cache_File implements SimplePie_Cache_Base

{

	/**

	 * Location string

	 *

	 * @see SimplePie::$cache_location

	 * @var string

	 */

	protected $location;

	/**

	 * Filename

	 *

	 * @var string

	 */

	protected $filename;

	/**

	 * File extension

	 *

	 * @var string

	 */

	protected $extension;

	/**

	 * File path

	 *

	 * @var string

	 */

	protected $name;

	/**

	 * 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)

	{

		$this->location = $location;

		$this->filename = $name;

		$this->extension = $type;

		$this->name = "$this->location/$this->filename.$this->extension";

	}

	/**

	 * 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)

	{

		if (file_exists($this->name) && is_writeable($this->name) || file_exists($this->location) && is_writeable($this->location))

		{

			if ($data instanceof SimplePie)

			{

				$data = $data->data;

			}

			$data = serialize($data);

			return (bool) file_put_contents($this->name, $data);

		}

		return false;

	}

	/**

	 * Retrieve the data saved to the cache

	 *

	 * @return array Data for SimplePie::$data

	 */

	public function load()

	{

		if (file_exists($this->name) && is_readable($this->name))

		{

			return unserialize(file_get_contents($this->name));

		}

		return false;

	}

	/**

	 * Retrieve the last modified time for the cache

	 *

	 * @return int Timestamp

	 */

	public function mtime()

	{

		if (file_exists($this->name))

		{

			return filemtime($this->name);

		}

		return false;

	}

	/**

	 * Set the last modified time to the current time

	 *

	 * @return bool Success status

	 */

	public function touch()

	{

		if (file_exists($this->name))

		{

			return touch($this->name);

		}

		return false;

	}

	/**

	 * Remove the cache

	 *

	 * @return bool Success status

	 */

	public function unlink()

	{

		if (file_exists($this->name))

		{

			return unlink($this->name);

		}

		return false;

	}

}