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<?php
/* --------------------------------------------------------------
   CustomerVatNumber.inc.php 2015-01-30 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2014 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('CustomerVatNumberInterface');
require_once __DIR__ . '/../../../../Shared/Utility/StringUtilityTrait.inc.php';

/**
 * Value Object
 *
 * Class CustomerVatNumber
 *
 * Represents a tax ID number (VATIN)
 *
 * @category   System
 * @package    Customer
 * @subpackage ValueObjects
 * @implements CustomerVatNumberInterface
 */
class CustomerVatNumber implements CustomerVatNumberInterface
{
    use StringUtilityTrait;
    
    /**
     * Customer's VAT number.
     * @var string
     */
    protected $vatNumber;


    /**
     * Constructor of the class CustomerVatNumber.
     *
     * Validates the length and the data type of the customer VAT number.
     *
     * @param string $p_vatNumber Customer's VAT number.
     *
     * @throws InvalidArgumentException If $p_vatNumber is not a string.
     * @throws LengthException If $p_vatNumber contains more characters than 20.
     */
    public function __construct($p_vatNumber)
    {
        if(!is_string($p_vatNumber))
        {
            throw new InvalidArgumentException('$p_vatNumber is not a string');
        }

        $dbFieldLength = 20;
        $vatNumber     = trim($p_vatNumber);

        if($this->strlenWrapper($vatNumber) > $dbFieldLength)
        {
            throw new LengthException('$vatNumber is longer than ' . $dbFieldLength . ' characters VARCHAR(20)');
        }

        $this->vatNumber = $vatNumber;
    }


    /**
     * Returns the equivalent string value.
     * @return string Equivalent string value.
     */
    public function __toString()
    {
        return $this->vatNumber;
    }
}