original_string: protected function _getPos($id)
      {
          if (!isset($this->_positions[$id - 1])) {
              /**
               * @see Zend_Mail_Storage_Exception
               */
              // require_once 'Zend/Mail/Storage/Exception.php';
              throw new Zend_Mail_Storage_Exception('id does not exist');
          }
  
          return $this->_positions[$id - 1];
      }
code: protected function _getPos($id)
      {
          if (!isset($this->_positions[$id - 1])) {
              /**
               * @see Zend_Mail_Storage_Exception
               */
              // require_once 'Zend/Mail/Storage/Exception.php';
              throw new Zend_Mail_Storage_Exception('id does not exist');
          }
  
          return $this->_positions[$id - 1];
      }
code_tokens: protected function _getPos ( $ id ) { if ( ! isset ( $ this -> _positions [ $ id - 1 ] ) ) { /**
               * @see Zend_Mail_Storage_Exception
               */ // require_once 'Zend/Mail/Storage/Exception.php'; throw new Zend_Mail_Storage_Exception ( 'id does not exist' ) ; } return $ this -> _positions [ $ id - 1 ] ; }
docstring: Get positions for mail message or throw exeption if id is invalid
  
  @param int $id number of message
  @return array positions as in _positions
  @throws Zend_Mail_Storage_Exception
docstring_tokens: Get positions for mail message or throw exeption if id is invalid