Method check

/**
 * Method to check the current record to save
 *
 * @return  boolean  True on success
 *
 * @since   1.7.0
 */
public function check()
{
    try {
        parent::check();
    } catch (\Exception $e) {
        $this->setError($e->getMessage());
        return false;
    }
    // Validate the title.
    if (trim($this->title) == '') {
        $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_TITLE'));
        return false;
    }
    // The parent_id can not be equal to the current id
    if ($this->id === (int) $this->parent_id) {
        $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_PARENT_ID_NOT_VALID'));
        return false;
    }
    // Check for a duplicate parent_id, title.
    // There is a unique index on the (parent_id, title) field in the table.
    $db = $this->_db;
    $parentId = (int) $this->parent_id;
    $title = trim($this->title);
    $id = (int) $this->id;
    $query = $db->getQuery(true)->select('COUNT(title)')->from($this->_tbl)->where($db->quoteName('title') . ' = :title')->where($db->quoteName('parent_id') . ' = :parentid')->where($db->quoteName('id') . ' <> :id')->bind(':title', $title)->bind(':parentid', $parentId, ParameterType::INTEGER)->bind(':id', $id, ParameterType::INTEGER);
    $db->setQuery($query);
    if ($db->loadResult() > 0) {
        $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_TITLE_EXISTS'));
        return false;
    }
    // We do not allow to move non public to root and public to non-root
    if (!empty($this->id)) {
        $table = self::getInstance('Usergroup', 'JTable', array('dbo' => $this->getDbo()));
        $table->load($this->id);
        if (!$table->parent_id && $this->parent_id || $table->parent_id && !$this->parent_id) {
            $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_PARENT_ID_NOT_VALID'));
            return false;
        }
    } elseif (!$this->parent_id) {
        $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_PARENT_ID_NOT_VALID'));
        return false;
    }
    // The new parent_id has to be a valid group
    if ($this->parent_id) {
        $table = self::getInstance('Usergroup', 'JTable', array('dbo' => $this->getDbo()));
        $table->load($this->parent_id);
        if ($table->id != $this->parent_id) {
            $this->setError(Text::_('JLIB_DATABASE_ERROR_USERGROUP_PARENT_ID_NOT_VALID'));
            return false;
        }
    }
    return true;
}