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<?php
/* --------------------------------------------------------------
EmailSubject.inc.php 2015-06-25 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('EmailSubjectInterface');
/**
* Class EmailSubject
*
* Subject assigned to an email.
*
* @category System
* @package Email
* @subpackage ValueObjects
*/
class EmailSubject implements EmailSubjectInterface
{
/**
* Defines the maximum db field length.
* @var int
*/
const MAX_LENGTH = 256;
/**
* Email subject.
* @var string
*/
protected $subject;
/**
* Constructor
*
* Executes the validation checks of the email subject.
*
* @throws InvalidArgumentException If the provided argument is not valid.
*
* @param string $p_subject E-Mail subject.
*/
public function __construct($p_subject)
{
if(!is_string($p_subject))
{
throw new InvalidArgumentException('Invalid argument provided (expected string subject) $p_subject: '
. print_r($p_subject, true));
}
if(strlen(trim($p_subject)) > self::MAX_LENGTH)
{
throw new InvalidArgumentException('Argument exceeded the maximum database field length ('
. self::MAX_LENGTH . '):' . $p_subject);
}
$this->subject = $p_subject;
}
/**
* Returns the email subject value.
*
* @return string Equivalent string.
*/
public function __toString()
{
return $this->subject;
}
}