<?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

 */

/**

 * Manages all category-related data

 *

 * Used by {@see SimplePie_Item::get_category()} and {@see SimplePie_Item::get_categories()}

 *

 * This class can be overloaded with {@see SimplePie::set_category_class()}

 *

 * @package SimplePie

 * @subpackage API

 */

class SimplePie_Category

{

	/**

	 * Category identifier

	 *

	 * @var string

	 * @see get_term

	 */

	var $term;

	/**

	 * Categorization scheme identifier

	 *

	 * @var string

	 * @see get_scheme()

	 */

	var $scheme;

	/**

	 * Human readable label

	 *

	 * @var string

	 * @see get_label()

	 */

	var $label;

	/**

	 * Constructor, used to input the data

	 *

	 * @param string $term

	 * @param string $scheme

	 * @param string $label

	 */

	public function __construct($term = null, $scheme = null, $label = null)

	{

		$this->term = $term;

		$this->scheme = $scheme;

		$this->label = $label;

	}

	/**

	 * String-ified version

	 *

	 * @return string

	 */

	public function __toString()

	{

		// There is no $this->data here

		return md5(serialize($this));

	}

	/**

	 * Get the category identifier

	 *

	 * @return string|null

	 */

	public function get_term()

	{

		if ($this->term !== null)

		{

			return $this->term;

		}

		else

		{

			return null;

		}

	}

	/**

	 * Get the categorization scheme identifier

	 *

	 * @return string|null

	 */

	public function get_scheme()

	{

		if ($this->scheme !== null)

		{

			return $this->scheme;

		}

		else

		{

			return null;

		}

	}

	/**

	 * Get the human readable label

	 *

	 * @return string|null

	 */

	public function get_label()

	{

		if ($this->label !== null)

		{

			return $this->label;

		}

		else

		{

			return $this->get_term();

		}

	}

}