protected function setDefaultDataTypes()
    {
        foreach ($this->_params as $key => $value) {
            switch (gettype($value)) {
                case "boolean":
                    $this->_types[$key] = 'boolean';
                    break;
                case "integer":
                    $this->_types[$key] = 'integer';
                    break;
                case "double":
                    $this->_types[$key] = 'float';
                    break;
                case "string":
                    $this->_types[$key] = 'string';
                    break;
                case "array":
                    $this->_types[$key] = 'array';
                    break;
                default:
                    $this->_types[$key] = null;
                    break;
            }
        }
    }