package atom

import (
	"encoding/xml"
	"errors"
)

type ExtensionAttribute struct {
	XMLName xml.Name
	Value   string
}

// NewExtensionAttribute creates a new ExtensionAttribute. It returns a
// *ExtensionAttribute.
func NewExtensionAttribute(name, value string) *ExtensionAttribute {
	return &ExtensionAttribute{XMLName: xml.Name{Local: name}, Value: value}
}

// Check checks the ExtensionAttribute for incompatibilities with RFC4287. It
// returns an error.
func (e *ExtensionAttribute) Check() error {
	if e.Value == "" {
		return errors.New("value of extension attribute empty")
	}

	return nil
}