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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Validate
  * @subpackage Sitemap
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Validate_Abstract
  */
 // require_once 'Zend/Validate/Abstract.php';
 
 /**
  * Validates whether a given value is valid as a sitemap <changefreq> value
  *
  * @link       http://www.sitemaps.org/protocol.php Sitemaps XML format
  *
  * @category   Zend
  * @package    Zend_Validate
  * @subpackage Sitemap
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Validate_Sitemap_Changefreq extends Zend_Validate_Abstract
 {
     /**
      * Validation key for not valid
      *
      */
     const NOT_VALID = 'sitemapChangefreqNotValid';
     const INVALID   = 'sitemapChangefreqInvalid';
 
     /**
      * Validation failure message template definitions
      *
      * @var array
      */
     protected $_messageTemplates = array(
         self::NOT_VALID => "'%value%' is not a valid sitemap changefreq",
         self::INVALID   => "Invalid type given. String expected",
     );
 
     /**
      * Valid change frequencies
      *
      * @var array
      */
     protected $_changeFreqs = array(
         'always',  'hourly', 'daily', 'weekly',
         'monthly', 'yearly', 'never'
     );
 
     /**
      * Validates if a string is valid as a sitemap changefreq
      *
      * @link http://www.sitemaps.org/protocol.php#changefreqdef <changefreq>
      *
      * @param  string  $value  value to validate
      * @return boolean
      */
     public function isValid($value)
     {
         if (!is_string($value)) {
             $this->_error(self::INVALID);
             return false;
         }
 
         $this->_setValue($value);
         if (!is_string($value)) {
             return false;
         }
 
         if (!in_array($value, $this->_changeFreqs, true)) {
             $this->_error(self::NOT_VALID);
             return false;
         }
 
         return true;
     }
 }