Method getStoreId

/**
 * Method to get a store id based on the model configuration state.
 *
 * This is necessary because the model is used by the component and
 * different modules that might need different sets of data or different
 * ordering requirements.
 *
 * @param   string  $id  An identifier string to generate the store id.
 *
 * @return  string  A store id.
 *
 * @since   1.6
 */
protected function getStoreId($id = '')
{
    // Add the list state to the store id.
    $id .= ':' . $this->getState('list.start');
    $id .= ':' . $this->getState('list.limit');
    $id .= ':' . $this->getState('list.ordering');
    $id .= ':' . $this->getState('list.direction');
    return md5($this->context . ':' . $id);
}