<?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
 */

/**
 * Handles `<media:restriction>` as defined in Media RSS
 *
 * Used by {@see SimplePie_Enclosure::get_restriction()} and {@see SimplePie_Enclosure::get_restrictions()}
 *
 * This class can be overloaded with {@see SimplePie::set_restriction_class()}
 *
 * @package SimplePie
 * @subpackage API
 */
class SimplePie_Restriction
{
	/**
	 * Relationship ('allow'/'deny')
	 *
	 * @var string
	 * @see get_relationship()
	 */
	var $relationship;

	/**
	 * Type of restriction
	 *
	 * @var string
	 * @see get_type()
	 */
	var $type;

	/**
	 * Restricted values
	 *
	 * @var string
	 * @see get_value()
	 */
	var $value;

	/**
	 * Constructor, used to input the data
	 *
	 * For documentation on all the parameters, see the corresponding
	 * properties and their accessors
	 */
	public function __construct($relationship = null, $type = null, $value = null)
	{
		$this->relationship = $relationship;
		$this->type = $type;
		$this->value = $value;
	}

	/**
	 * String-ified version
	 *
	 * @return string
	 */
	public function __toString()
	{
		// There is no $this->data here
		return md5(serialize($this));
	}

	/**
	 * Get the relationship
	 *
	 * @return string|null Either 'allow' or 'deny'
	 */
	public function get_relationship()
	{
		if ($this->relationship !== null)
		{
			return $this->relationship;
		}

		return null;
	}

	/**
	 * Get the type
	 *
	 * @return string|null
	 */
	public function get_type()
	{
		if ($this->type !== null)
		{
			return $this->type;
		}

		return null;
	}

	/**
	 * Get the list of restricted things
	 *
	 * @return string|null
	 */
	public function get_value()
	{
		if ($this->value !== null)
		{
			return $this->value;
		}

		return null;
	}
}

> 
> class_alias('SimplePie_Restriction', 'SimplePie\Restriction', false);