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<?php
/* --------------------------------------------------------------
   ContactType.inc.php 2015-02-03 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('ContactTypeInterface');

/**
 * Class ContactType
 *
 * @category   System
 * @package    Email
 * @subpackage ValueObjects
 */
class ContactType implements ContactTypeInterface
{
    /**
     * Contact type.
     * @var string
     */
    protected $type;

    /**
     * Type Constants
     */
    const SENDER    = 'sender';
    const RECIPIENT = 'recipient';
    const REPLY_TO  = 'reply_to';
    const BCC       = 'bcc';
    const CC        = 'cc';


    /**
     * Class Constructor
     *
     * @param string $p_type Value has to be one of the declared constants, e.g. self::SENDER which value is 'sender'.
     * @throws InvalidArgumentException On empty or invalid argument.
     */
    public function __construct($p_type)
    {
        if(!is_string($p_type) || empty($p_type)
           || ($p_type != self::SENDER && $p_type != self::RECIPIENT && $p_type != self::BCC
               && $p_type != self::CC
               && $p_type != self::REPLY_TO)
        )
        {
            throw new InvalidArgumentException('Invalid contact type provided (string constant expected): '
                                               . print_r($p_type, true));
        }
        $this->type = $p_type;
    }


    /**
     * Returns the contact type as a string.
     *
     * @return string Equivalent string.
     */
    public function __toString()
    {
        return $this->type;
    }
}