<?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 class for database-based caches

 *

 * @package SimplePie

 * @subpackage Caching

 */

abstract class SimplePie_Cache_DB implements SimplePie_Cache_Base

{

	/**

	 * Helper for database conversion

	 *

	 * Converts a given {@see SimplePie} object into data to be stored

	 *

	 * @param SimplePie $data

	 * @return array First item is the serialized data for storage, second item is the unique ID for this item

	 */

	protected static function prepare_simplepie_object_for_cache($data)

	{

		$items = $data->get_items();

		$items_by_id = array();

		if (!empty($items))

		{

			foreach ($items as $item)

			{

				$items_by_id[$item->get_id()] = $item;

			}

			if (count($items_by_id) !== count($items))

			{

				$items_by_id = array();

				foreach ($items as $item)

				{

					$items_by_id[$item->get_id(true)] = $item;

				}

			}

			if (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]))

			{

				$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0];

			}

			elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]))

			{

				$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0];

			}

			elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]))

			{

				$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0];

			}

			elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0]))

			{

				$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0];

			}

			else

			{

				$channel = null;

			}

			if ($channel !== null)

			{

				if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']))

				{

					unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']);

				}

				if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']))

				{

					unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']);

				}

				if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']))

				{

					unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']);

				}

				if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']))

				{

					unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']);

				}

				if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']))

				{

					unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']);

				}

			}

			if (isset($data->data['items']))

			{

				unset($data->data['items']);

			}

			if (isset($data->data['ordered_items']))

			{

				unset($data->data['ordered_items']);

			}

		}

		return array(serialize($data->data), $items_by_id);

	}

}