hook_language_negotiation_info for custom provider

Drupal lang negotiation my.module

/**
 * Implements hook_language_negotiation_info().
 */
function nap_language_negotiation_info() {
  return array(
    'nap_language_provider' => array(
      'callbacks' => array(
        'language' => 'MODULE_language_provider_callback',
        'switcher' => 'MODULE_language_switcher_callback',
        'url_rewrite' => 'MODULE_language_url_rewrite_callback',
      ),
      'file' => drupal_get_path('module', 'nap') . '/nap.locale.inc',
      'name' => t('My Language Selection'),
      'description' => t('My Custom language selection mechanism.'),
    ),
  );
}